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 <appendix id="features">
  <title>SQL99 Feature List</title>

  <para>
   <acronym>SQL92</acronym> defined three feature sets for
   compliance: basic, intermediate, and advanced. Most database
   products claiming <acronym>SQL</acronym> standards compliance were
   compliant at only the basic level, since the entire set of
   intermediate and advanced features was either too voluminous or in
   conflict with legacy behaviors.
  </para>

  <para>
   <acronym>SQL99</acronym> defines a large set of individual
   features rather than the ineffectively broad three levels found in
   <acronym>SQL92</acronym>. We provide a list of supported features,
   followed by a list of the features defined in SQL99 which are not
   yet supported in PostgreSQL.
  </para>

  <sect1 id="features-sql99">
   <title>Supported Features</title>

   <para>
    <informaltable>
     <tgroup cols="3">
      <thead>
       <row>
        <entry>Identifier</entry>
        <entry>Description</entry>
        <entry>Comment</entry>
       </row>
      </thead>
      <tbody>
       <row>
        <entry>E011</entry>
        <entry>Numeric data types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E011-01</entry>
        <entry>INTEGER and SMALLINT data types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E011-02</entry>
        <entry>REAL, DOUBLE PRECISON, and FLOAT data types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E011-03</entry>
        <entry>DECIMAL and NUMERIC data types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E011-04</entry>
        <entry>Arithmetic operators</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E011-05</entry>
        <entry>Numeric comparison</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E011-06</entry>
        <entry>Implicit casting among the numeric data types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E021</entry>
        <entry>Character data types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E021-01</entry>
        <entry>CHARACTER data type</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E021-02</entry>
        <entry>CHARACTER VARYING data type</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E021-03</entry>
        <entry>Character literals</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E021-04</entry>
        <entry>CHARACTER_LENGTH function</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E021-05</entry>
        <entry>OCTET_LENGTH function</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E021-06</entry>
        <entry>SUBSTRING function</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E021-07</entry>
        <entry>Character concatenation</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E021-08</entry>
        <entry>UPPER and LOWER functions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E021-09</entry>
        <entry>TRIM function</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E021-10</entry>
        <entry>Implicit casting among the character data types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E021-11</entry>
        <entry>POSITION function</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E011-12</entry>
        <entry>Character comparison</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E031</entry>
        <entry>Identifiers</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E031-01</entry>
        <entry>Delimited identifiers</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E031-02</entry>
        <entry>Lower case identifiers</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E031-03</entry>
        <entry>Trailing underscore</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E051</entry>
        <entry>Basic query specification</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E051-01</entry>
        <entry>SELECT DISTINCT</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E051-02</entry>
        <entry>GROUP BY clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E051-04</entry>
        <entry>GROUP BY can contain columns not in &lt;select list&gt;</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E051-05</entry>
        <entry>Select list items can be renamed</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E051-06</entry>
        <entry>HAVING clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E051-07</entry>
        <entry>Qualified * in select list</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E051-08</entry>
        <entry>Correlation names in the FROM clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E051-09</entry>
        <entry>Rename columns in the FROM clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061</entry>
        <entry>Basic predicates and search conditions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-01</entry>
        <entry>Comparison predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-02</entry>
        <entry>BETWEEN predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-03</entry>
        <entry>IN predicate with list of values</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-04</entry>
        <entry>LIKE predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-05</entry>
        <entry>LIKE predicate ESCAPE clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-06</entry>
        <entry>NULL predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-07</entry>
        <entry>Quantified comparison predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-08</entry>
        <entry>EXISTS predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-09</entry>
        <entry>Subqueries in comparison predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-11</entry>
        <entry>Subqueries in IN predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-12</entry>
        <entry>Subqueries in quantified comparison predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-13</entry>
        <entry>Correlated subqueries</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E061-14</entry>
        <entry>Search condition</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E071</entry>
        <entry>Basic query expressions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E071-01</entry>
        <entry>UNION DISTINCT table operator</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E071-02</entry>
        <entry>UNION ALL table operator</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E071-03</entry>
        <entry>EXCEPT DISTINCT table operator</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E071-05</entry>
        <entry>Columns combined via table operators need not have
         exactly the same data type</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>E071-06</entry>
        <entry>Table operators in subqueries</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E081</entry>
        <entry>Basic Privileges</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E081-01</entry>
        <entry>SELECT privilege</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E081-02</entry>
        <entry>DELETE privilege</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E081-03</entry>
        <entry>INSERT privilege at the table level</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E081-04</entry>
        <entry>UPDATE privilege at the table level</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E081-06</entry>
        <entry>REFERENCES privilege at the table level</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E081-08</entry>
        <entry>WITH GRANT OPTION</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E091</entry>
        <entry>Set functions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E091-01</entry>
        <entry>AVG</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E091-02</entry>
        <entry>COUNT</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E091-03</entry>
        <entry>MAX</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E091-04</entry>
        <entry>MIN</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E091-05</entry>
        <entry>SUM</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E091-06</entry>
        <entry>ALL quantifier</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E091-07</entry>
        <entry>DISTINCT quantifier</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E101</entry>
        <entry>Basic data manipulation</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E101-01</entry>
        <entry>INSERT statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E101-03</entry>
        <entry>Searched UPDATE statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E101-04</entry>
        <entry>Searched DELETE statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E111</entry>
        <entry>Single row SELECT statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E121</entry>
        <entry>Basic cursor support</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E121-01</entry>
        <entry>DECLARE CURSOR</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E121-02</entry>
        <entry>ORDER BY columns need not be in select list</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E121-03</entry>
        <entry>Value expressions in ORDER BY clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E121-04</entry>
        <entry>OPEN statement</entry>
        <entry>(cursor)</entry>
       </row>
       <row>
        <entry>E121-06</entry>
        <entry>Positioned UPDATE statement</entry>
        <entry>(cursor)</entry>
       </row>
       <row>
        <entry>E121-07</entry>
        <entry>Positioned DELETE statement</entry>
        <entry>(cursor)</entry>
       </row>
       <row>
        <entry>E121-08</entry>
        <entry>CLOSE statement</entry>
        <entry>(cursor)</entry>
       </row>
       <row>
        <entry>E121-10</entry>
        <entry>FETCH statement implicit NEXT</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E131</entry>
        <entry>Null value support (nulls in lieu of values)</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>E141</entry>
        <entry>Basic integrity constraints</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E141-01</entry>
        <entry>NOT NULL constraints</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E141-02</entry>
        <entry>UNIQUE constraints of NOT NULL columns</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E141-03</entry>
        <entry>PRIMARY KEY constraints</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E141-04</entry>
        <entry>Basic FOREIGN KEY constraint with the NO ACTION default
         for both referential delete action and referential update
         action</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E141-06</entry>
        <entry>CHECK constraints</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E141-07</entry>
        <entry>Column defaults</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E141-08</entry>
        <entry>NOT NULL inferred on PRIMARY KEY</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E141-10</entry>
        <entry>Names in a foreign key can be specified in any order</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E151</entry>
        <entry>Transaction support</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E151-01</entry>
        <entry>COMMIT statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E151-02</entry>
        <entry>ROLLBACK statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E152</entry>
        <entry>Basic SET TRANSACTION statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E152-01</entry>
        <entry>SET TRANSACTION statement: ISOLATION LEVEL SERIALIZABLE
         clause</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>E153</entry>
        <entry>Updatable queries with subqueries</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E161</entry>
        <entry>SQL comments using leading double minus</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F031</entry>
        <entry>Basic schema manipulation</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F031-01</entry>
        <entry>CREATE TABLE statement to create persistent base
         tables</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F031-02</entry>
        <entry>CREATE VIEW statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F031-03</entry>
        <entry>GRANT statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F031-04</entry>
        <entry>ALTER TABLE statement COLUMN clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F031-13</entry>
        <entry>DROP TABLE statement clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F031-16</entry>
        <entry>DROP VIEW statement RESTRICT clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F031-19</entry>
        <entry>REVOKE statement RESTRICT clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F041</entry>
        <entry>Basic joined table</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F041-01</entry>
        <entry>Inner join (but not necessarily the INNER keyword)</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F041-02</entry>
        <entry>INNER keyword</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F041-03</entry>
        <entry>LEFT OUTER JOIN</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F041-04</entry>
        <entry>RIGHT OUTER JOIN</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F041-05</entry>
        <entry>Outer joins can be nested</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F041-07</entry>
        <entry>The inner table in a left or right outer join can also be
         used in an inner join</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>F041-08</entry>
        <entry>All comparison operators are supported
         (rather than just =)</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>F051</entry>
        <entry>Basic date and time</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F051-01</entry>
        <entry>DATE data type (including support of DATE literal)</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F051-02</entry>
        <entry>TIME data type (including support of TIME literal) with
         fractional seconds precision of at least 0</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>F051-03</entry>
        <entry>TIMESTAMP data type (including support of TIMESTAMP
         literal) with fractional seconds precision of at least
         0 and 6</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>F051-04</entry>
        <entry>Comparison predicate on DATE TIMESTAMP data types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F051-05</entry>
        <entry>Explicit CAST between datetime types and character types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F051-06</entry>
        <entry>CURRENT_DATE</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F051-07</entry>
        <entry>LOCALTIME</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F051-08</entry>
        <entry>LOCALTIMESTAMP</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F081</entry>
        <entry>UNION and EXCEPT in views</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F131</entry>
        <entry>Grouped operations</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F131-01</entry>
        <entry>WHERE, GROUP BY and HAVING clauses supported in queries
         with grouped views</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>F131-02</entry>
        <entry>Multiple tables supported in queries with grouped
         views</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>F131-03</entry>
        <entry>Set functions supported in queries with grouped views</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F131-04</entry>
        <entry>Subqueries with GROUP BY and HAVING clauses and grouped
         views</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>F131-05</entry>
        <entry>Single row SELECT with GROUP BY and HAVING clauses and
         grouped views</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>F181</entry>
        <entry>Multiple module support</entry>
        <entry>Allow separate compilation modules in ecpg</entry>
       </row>
       <row>
        <entry>F201</entry>
        <entry>CAST function</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>F221</entry>
        <entry>Explicit defaults</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F261</entry>
        <entry>CASE expression</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F261-01</entry>
        <entry>Simple CASE</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F261-02</entry>
        <entry>Searched CASE</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F261-03</entry>
        <entry>NULLIF</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F261-04</entry>
        <entry>COALESCE</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F311</entry>
        <entry>Schema definition statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F311-01</entry>
        <entry>CREATE SCHEMA</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F311-02</entry>
        <entry>CREATE TABLE for persistent base tables</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F311-03</entry>
        <entry>CREATE VIEW</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F311-04</entry>
        <entry>CREATE VIEW: WITH CHECK OPTION</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F311-05</entry>
        <entry>GRANT statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F471</entry>
        <entry>Scalar subquery values</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F481</entry>
        <entry>Expanded NULL predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S011</entry>
        <entry>Distinct data types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T321</entry>
        <entry>Basic SQL-invoked routines</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T321-01</entry>
        <entry>User-defined functions with no overloading</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T321-03</entry>
        <entry>Function invocation</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T321-05</entry>
        <entry>RETURN statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F032</entry>
        <entry>CASCADE drop behavior</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F034</entry>
        <entry>Extended REVOKE statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F034-01</entry>
        <entry>REVOKE statement performed by other than the owner of a
         schema object</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>F034-02</entry>
        <entry>REVOKE statement: GRANT OPTION FOR clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F034-03</entry>
        <entry>REVOKE statement to revoke a privilege that the grantee
         has WITH GRANT OPTION</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>F052</entry>
        <entry>Intervals and datetime arithmetic</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F111</entry>
        <entry>Isolation levels other than SERIALIZABLE</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F111-02</entry>
        <entry>READ COMMITTED isolation level</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F171</entry>
        <entry>Multiple schemas per user</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F191</entry>
        <entry>Referential delete actions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F222</entry>
        <entry>INSERT statement: DEFAULT VALUES clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F271</entry>
        <entry>Compound character literals</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F281</entry>
        <entry>LIKE enhancements</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F302</entry>
        <entry>INTERSECT table operator</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F302-01</entry>
        <entry>INTERSECT DISTINCT table operator</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F302-02</entry>
        <entry>INTERSECT ALL table operator</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F304</entry>
        <entry>EXCEPT ALL table operator</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F321</entry>
        <entry>User authorization</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F341</entry>
        <entry>Usage tables</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F361</entry>
        <entry>Subprogram support</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F381-01</entry>
        <entry>ALTER TABLE statement: ALTER COLUMN clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F381-02</entry>
        <entry>ALTER TABLE statement: ADD CONSTRAINT clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F381-03</entry>
        <entry>ALTER TABLE statement: DROP CONSTRAINT clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F391</entry>
        <entry>Long identifiers</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F401</entry>
        <entry>Extended joined table</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F401-01</entry>
        <entry>NATURAL JOIN</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F401-02</entry>
        <entry>FULL OUTER JOIN</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F401-03</entry>
        <entry>UNION JOIN</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F401-04</entry>
        <entry>CROSS JOIN</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F411</entry>
        <entry>Time zone specification</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F431</entry>
        <entry>Read-only scrollable cursors</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F431-01</entry>
        <entry>FETCH with explicit NEXT</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F431-02</entry>
        <entry>FETCH FIRST</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F431-03</entry>
        <entry>FETCH LAST</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F431-04</entry>
        <entry>FETCH PRIOR</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F431-05</entry>
        <entry>FETCH ABSOLUTE</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F431-06</entry>
        <entry>FETCH RELATIVE</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F461</entry>
        <entry>Named character sets</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F491</entry>
        <entry>Constraint management</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F511</entry>
        <entry>BIT data type</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F531</entry>
        <entry>Temporary tables</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F555</entry>
        <entry>Enhanced seconds precision</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F561</entry>
        <entry>Full value expressions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F571</entry>
        <entry>Truth value tests</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F591</entry>
        <entry>Derived tables</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F611</entry>
        <entry>Indicator data types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F641</entry>
        <entry>Row and table constructors</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F651</entry>
        <entry>Catalog name qualifiers</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F661</entry>
        <entry>Simple tables</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F701</entry>
        <entry>Referential update actions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F741</entry>
        <entry>Referential MATCH types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F761</entry>
        <entry>Session management</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F771</entry>
        <entry>Connection management</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F791</entry>
        <entry>Insensitive cursors</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F831</entry>
        <entry>Full cursor update</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F831-01</entry>
        <entry>Updateable scrollable cursors</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F831-02</entry>
        <entry>Updateable ordered cursors</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S071</entry>
        <entry>SQL paths in function and type name resolution</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S091</entry>
        <entry>Basic array support</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S091-01</entry>
        <entry>Arrays of built-in data types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S092</entry>
        <entry>Arrays of user-defined types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S201</entry>
        <entry>SQL routines on arrays</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S201-01</entry>
        <entry>Array parameters</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S201-02</entry>
        <entry>Array as result type of functions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S211</entry>
        <entry>User-defined cast functions</entry>
        <entry>CREATE CAST(type AS type)</entry>
       </row>
       <row>
        <entry>T031</entry>
        <entry>BOOLEAN data type</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T141</entry>
        <entry>SIMILAR predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T191</entry>
        <entry>Referential action RESTRICT</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T201</entry>
        <entry>Comparable data types for referential constraints</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T211</entry>
        <entry>Basic trigger capability</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T211-01</entry>
        <entry>Triggers activated on UPDATE, INSERT, or DELETE of one
         base table</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>T211-02</entry>
        <entry>BEFORE triggers</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T211-03</entry>
        <entry>AFTER triggers</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T211-04</entry>
        <entry>FOR EACH ROW triggers</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T211-08</entry>
        <entry>Multiple triggers for the same the event are executed in
         the order in which they were created</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>T212</entry>
        <entry>Enhanced trigger capability</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T231</entry>
        <entry>SENSITIVE cursors</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T241</entry>
        <entry>START TRANSACTION statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T251</entry>
        <entry>SET TRANSACTION statement: LOCAL option</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T312</entry>
        <entry>OVERLAY function</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T322</entry>
        <entry>Overloading of SQL-invoked functions and procedures</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T323</entry>
        <entry>Explicit security for external routines</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T351</entry>
        <entry>Bracketed SQL comments (/*...*/ comments)</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T401</entry>
        <entry>INSERT into a cursor</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T441</entry>
        <entry>ABS and MOD functions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T461</entry>
        <entry>Symmetric BETWEEN predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T501</entry>
        <entry>Enhanced EXISTS predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T551</entry>
        <entry>Optional key words for default syntax</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T571</entry>
        <entry>Array-returning external SQL-invoked functions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T581</entry>
        <entry>Regular expression substring function</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T591</entry>
        <entry>UNIQUE constraints of possibly null columns</entry>
        <entry></entry>
       </row>
      </tbody>
     </tgroup>
    </informaltable>
   </para>
  </sect1>

  <sect1 id="unsupported-features-sql99">
   <title>Unsupported Features</title>

   <para>
    The following features defined in <acronym>SQL99</acronym> are not
    implemented in the current release of
    <productname>PostgreSQL</productname>. In a few cases, equivalent
    functionality is available.

    <informaltable>
     <tgroup cols="3">
      <thead>
       <row>
        <entry>Identifier</entry>
        <entry>Description</entry>
        <entry>Comment</entry>
       </row>
      </thead>
      <tbody>
       <row>
        <entry>E081-05</entry>
        <entry>UPDATE privilege at the column level</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E081-07</entry>
        <entry>REFERENCES privilege at the column level</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E121-17</entry>
        <entry>WITH HOLD cursors</entry>
        <entry>Cursor stays open across transactions</entry>
       </row>
       <row>
        <entry>E152-02</entry>
        <entry>SET TRANSACTION statement: READ ONLY and READ WRITE
         clauses</entry> 
        <entry>Syntax accepted; READ ONLY not supported</entry>
       </row>
       <row>
        <entry>E171</entry>
        <entry>SQLSTATE support</entry>
        <entry></entry>
       </row>
       <row>
        <entry>E182</entry>
        <entry>Module language</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F021</entry>
        <entry>Basic information schema</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F021-01</entry>
        <entry>COLUMNS view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F021-02</entry>
        <entry>TABLES view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F021-03</entry>
        <entry>VIEWS view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F021-04</entry>
        <entry>TABLE_CONSTRAINTS view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F021-05</entry>
        <entry>REFERENTIAL_CONSTRAINTS view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F021-06</entry>
        <entry>CHECK_CONSTRAINTS view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F033</entry>
        <entry>ALTER TABLE statement: DROP COLUMN clause</entry>
        <entry>Syntax accepted</entry>
       </row>
       <row>
        <entry>F111-01</entry>
        <entry>READ UNCOMMITTED isolation level</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F111-03</entry>
        <entry>REPEATABLE READ isolation level</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F121</entry>
        <entry>Basic diagnostics management</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F121-01</entry>
        <entry>GET DIAGNOSTICS statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F121-02</entry>
        <entry>SET TRANSACTION statement: DIAGNOSTICS SIZE clause</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F231</entry>
        <entry>Privilege Tables</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F231-01</entry>
        <entry>TABLE_PRIVILEGES view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F231-02</entry>
        <entry>COLUMN_PRIVILEGES view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F231-03</entry>
        <entry>USAGE_PRIVILEGES view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F251</entry>
        <entry>Domain support</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F291</entry>
        <entry>UNIQUE predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F301</entry>
        <entry>CORRESPONDING in query expressions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F381</entry>
        <entry>Extended schema manipulation</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F421</entry>
        <entry>National character</entry>
        <entry>Syntax accepted</entry>
       </row>
       <row>
        <entry>F441</entry>
        <entry>Extended set function support</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F451</entry>
        <entry>Character set definition</entry>
        <entry>Alternate implementation</entry>
       </row>
       <row>
        <entry>F501</entry>
        <entry>Features and conformance views</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F501-01</entry>
        <entry>SQL_FEATURES view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F501-02</entry>
        <entry>SQL_SIZING view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F501-03</entry>
        <entry>SQL_LANGUAGES view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F502</entry>
        <entry>Enhanced documentation tables</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F502-01</entry>
        <entry>SQL_SIZING_PROFILES view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F502-02</entry>
        <entry>SQL_IMPLEMENTATION_INFO view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F502-03</entry>
        <entry>SQL_PACKAGES view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F521</entry>
        <entry>Assertions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F671</entry>
        <entry>Subqueries in CHECK</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F691</entry>
        <entry>Collation and translation</entry>
        <entry>Alternate implementation</entry>
       </row>
       <row>
        <entry>F711</entry>
        <entry>ALTER domain</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F721</entry>
        <entry>Deferrable constraints</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F731</entry>
        <entry>INSERT column privileges</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F751</entry>
        <entry>View CHECK enhancements</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F781</entry>
        <entry>Self-referencing operations</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F801</entry>
        <entry>Full set function</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F811</entry>
        <entry>Extended flagging</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F812</entry>
        <entry>Basic flagging</entry>
        <entry></entry>
       </row>
       <row>
        <entry>F813</entry>
        <entry>Extended flagging for "Core SQL Flagging" and "Catalog
         Lookup" only</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>F821</entry>
        <entry>Local table references</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S011-01</entry>
        <entry>USER_DEFINED_TYPES view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S023</entry>
        <entry>Basic structured types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S024</entry>
        <entry>Enhanced structured types</entry>
        <entry>Alternate implementation</entry>
       </row>
       <row>
        <entry>S041</entry>
        <entry>Basic reference types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S043</entry>
        <entry>Enhanced reference types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S051</entry>
        <entry>Create table of type</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S081</entry>
        <entry>Subtables</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S091-02</entry>
        <entry>Arrays of distinct types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S091-03</entry>
        <entry>Array expressions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S094</entry>
        <entry>Arrays of reference types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S111</entry>
        <entry>ONLY in query expressions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S151</entry>
        <entry>Type predicate</entry>
        <entry>IS OF (type list)</entry>
       </row>
       <row>
        <entry>S161</entry>
        <entry>Subtype treatment</entry>
        <entry>TREAT(expr AS type)</entry>
       </row>
       <row>
        <entry>S231</entry>
        <entry>Structured type locators</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S232</entry>
        <entry>Array locators</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S241</entry>
        <entry>Transform functions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>S251</entry>
        <entry>User-defined orderings</entry>
        <entry>CREATE ORDERING FOR</entry>
       </row>
       <row>
        <entry>S261</entry>
        <entry>Specific type method</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T011</entry>
        <entry>Timestamp in Information Schema</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T041</entry>
        <entry>Basic LOB data type support</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T041-01</entry>
        <entry>BLOB data type</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T041-02</entry>
        <entry>CLOB data type</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T041-03</entry>
        <entry>POSITION, LENGTH, LOWER, TRIM, UPPER, and SUBSTRING
         functions for LOB data types</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>T041-04</entry>
        <entry>Concatenation of LOB data types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T041-05</entry>
        <entry>LOB locator: non-holdable</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T042</entry>
        <entry>Extended LOB data type support</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T051</entry>
        <entry>Row types</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T111</entry>
        <entry>Updatable joins, unions, and columns</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T121</entry>
        <entry>WITH (excluding RECURSIVE) in query expression</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T131</entry>
        <entry>Recursive query</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T151</entry>
        <entry>DISTINCT predicate</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T171</entry>
        <entry>LIKE clause in table definition</entry>
        <entry>CREATE TABLE T1 (LIKE T2)</entry>
       </row>
       <row>
        <entry>T211-05</entry>
        <entry>Ability to specify a search condition that must be true
         before the trigger is invoked</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>T211-06</entry>
        <entry>Support for run-time rules for the interaction of triggers
         and constraints</entry> 
        <entry></entry>
       </row>
       <row>
        <entry>T211-07</entry>
        <entry>TRIGGER privilege</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T261</entry>
        <entry>Chained transactions</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T271</entry>
        <entry>Savepoints</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T281</entry>
        <entry>SELECT privilege with column granularity</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T301</entry>
        <entry>Functional Dependencies</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T321-02</entry>
        <entry>User-defined stored procedures with no overloading</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T321-04</entry>
        <entry>CALL statement</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T321-06</entry>
        <entry>ROUTINES view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T321-07</entry>
        <entry>PARAMETERS view</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T331</entry>
        <entry>Basic roles</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T332</entry>
        <entry>Extended roles</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T411</entry>
        <entry>UPDATE statement: SET ROW option</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T431</entry>
        <entry>CUBE and ROLLUP operations</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T471</entry>
        <entry>Result sets return value</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T491</entry>
        <entry>LATERAL derived table</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T511</entry>
        <entry>Transaction counts</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T541</entry>
        <entry>Updatable table references</entry>
        <entry>?</entry>
       </row>
       <row>
        <entry>T561</entry>
        <entry>Holdable locators</entry>
        <entry></entry>
       </row>
       <row>
        <entry>T601</entry>
        <entry>Local cursor references</entry>
        <entry></entry>
       </row>
      </tbody>
     </tgroup>
    </informaltable>
   </para>
  </sect1>
 </appendix>

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