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Postgres FD Implementation
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Abuhujair Javed
Postgres FD Implementation
Commits
0eed62f3
Commit
0eed62f3
authored
Jan 15, 2003
by
Bruce Momjian
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Reorder VARCHAR() to appear before CHAR() in docs.
parent
d14c64c4
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-53
doc/src/sgml/datatype.sgml
doc/src/sgml/datatype.sgml
+47
-48
doc/src/sgml/sql.sgml
doc/src/sgml/sql.sgml
+6
-5
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doc/src/sgml/datatype.sgml
View file @
0eed62f3
<!--
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.11
0 2002/12/06 05:17:42
momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.11
1 2003/01/15 18:01:04
momjian Exp $
-->
-->
<chapter id="datatype">
<chapter id="datatype">
...
@@ -86,18 +86,18 @@ $Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.110 2002/12/06 05:17:42 m
...
@@ -86,18 +86,18 @@ $Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.110 2002/12/06 05:17:42 m
<entry>binary data</entry>
<entry>binary data</entry>
</row>
</row>
<row>
<entry><type>character(<replaceable>n</replaceable>)</type></entry>
<entry><type>char(<replaceable>n</replaceable>)</type></entry>
<entry>fixed-length character string</entry>
</row>
<row>
<row>
<entry><type>character varying(<replaceable>n</replaceable>)</type></entry>
<entry><type>character varying(<replaceable>n</replaceable>)</type></entry>
<entry><type>varchar(<replaceable>n</replaceable>)</type></entry>
<entry><type>varchar(<replaceable>n</replaceable>)</type></entry>
<entry>variable-length character string</entry>
<entry>variable-length character string</entry>
</row>
</row>
<row>
<entry><type>character(<replaceable>n</replaceable>)</type></entry>
<entry><type>char(<replaceable>n</replaceable>)</type></entry>
<entry>fixed-length character string</entry>
</row>
<row>
<row>
<entry><type>cidr</type></entry>
<entry><type>cidr</type></entry>
<entry></entry>
<entry></entry>
...
@@ -248,7 +248,7 @@ $Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.110 2002/12/06 05:17:42 m
...
@@ -248,7 +248,7 @@ $Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.110 2002/12/06 05:17:42 m
The following types (or spellings thereof) are specified by
The following types (or spellings thereof) are specified by
<acronym>SQL</acronym>: <type>bit</type>, <type>bit
<acronym>SQL</acronym>: <type>bit</type>, <type>bit
varying</type>, <type>boolean</type>, <type>char</type>,
varying</type>, <type>boolean</type>, <type>char</type>,
<type>character
</type>, <type>character varying
</type>,
<type>character
varying</type>, <type>character
</type>,
<type>varchar</type>, <type>date</type>, <type>double
<type>varchar</type>, <type>date</type>, <type>double
precision</type>, <type>integer</type>, <type>interval</type>,
precision</type>, <type>integer</type>, <type>interval</type>,
<type>numeric</type>, <type>decimal</type>, <type>real</type>,
<type>numeric</type>, <type>decimal</type>, <type>real</type>,
...
@@ -811,14 +811,14 @@ CREATE TABLE <replaceable class="parameter">tablename</replaceable> (
...
@@ -811,14 +811,14 @@ CREATE TABLE <replaceable class="parameter">tablename</replaceable> (
</row>
</row>
</thead>
</thead>
<tbody>
<tbody>
<row>
<entry><type>character(<replaceable>n</>)</type>, <type>char(<replaceable>n</>)</type></entry>
<entry>fixed-length, blank padded</entry>
</row>
<row>
<row>
<entry><type>character varying(<replaceable>n</>)</type>, <type>varchar(<replaceable>n</>)</type></entry>
<entry><type>character varying(<replaceable>n</>)</type>, <type>varchar(<replaceable>n</>)</type></entry>
<entry>variable-length with limit</entry>
<entry>variable-length with limit</entry>
</row>
</row>
<row>
<entry><type>character(<replaceable>n</>)</type>, <type>char(<replaceable>n</>)</type></entry>
<entry>fixed-length, blank padded</entry>
</row>
<row>
<row>
<entry><type>text</type></entry>
<entry><type>text</type></entry>
<entry>variable unlimited length</entry>
<entry>variable unlimited length</entry>
...
@@ -835,29 +835,29 @@ CREATE TABLE <replaceable class="parameter">tablename</replaceable> (
...
@@ -835,29 +835,29 @@ CREATE TABLE <replaceable class="parameter">tablename</replaceable> (
<para>
<para>
<acronym>SQL</acronym> defines two primary character types:
<acronym>SQL</acronym> defines two primary character types:
<type>character
(<replaceable>n</>)</type> and <type>character
<type>character
varying(<replaceable>n</>)</type> and
varying(<replaceable>n</>)</type>, where <replaceable>n</> is a
<type>character(<replaceable>n</>)</type>, where <replaceable>n</>
positive integer. Both of these types can store strings up to
is a
positive integer. Both of these types can store strings up to
<replaceable>n</> characters in length. An attempt to store a
<replaceable>n</> characters in length. An attempt to store a
longer string into a column of these types will result in an
longer string into a column of these types will result in an
error, unless the excess characters are all spaces, in which case
error, unless the excess characters are all spaces, in which case
the string will be truncated to the maximum length.
(This
the string will be truncated to the maximum length.
(This somewhat
somewhat bizarre exception is required by the
bizarre exception is required by the <acronym>SQL</acronym>
<acronym>SQL</acronym> standard.) If the string to be stored is
standard.) If the string to be stored is shorter than the declared
shorter than the declared length, values of type
length, values of type <type>character</type> will be space-padded;
<type>character</type> will be space-padded; values of typ
e
values of type <type>character varying</type> will simply store th
e
<type>character varying</type> will simply store the
shorter
shorter
string.
string.
</para>
</para>
<note>
<note>
<para>
<para>
If one explicitly casts a value to
If one explicitly casts a value to
<type>character
<type>character(<replaceable>n</>)</type> or <type>characte
r
varying(<replaceable>n</>)</type> o
r
varying(<replaceable>n</>)</type>, then an overlength value will
<type>character(<replaceable>n</>)</type>, then an over-length
be truncated to <replaceable>n</> characters without raising an
value will be truncated to <replaceable>n</> characters without
error. (This too is required by the <acronym>SQL</acronym>
raising an error. (This too is required by the
standard.)
<acronym>SQL</acronym>
standard.)
</para>
</para>
</note>
</note>
...
@@ -870,14 +870,14 @@ CREATE TABLE <replaceable class="parameter">tablename</replaceable> (
...
@@ -870,14 +870,14 @@ CREATE TABLE <replaceable class="parameter">tablename</replaceable> (
</note>
</note>
<para>
<para>
The notations <type>char(<replaceable>n</>)</type> and
The notations <type>
var
char(<replaceable>n</>)</type> and
<type>
varchar(<replaceable>n</>)</type> are aliases fo
r
<type>
char(<replaceable>n</>)</type> are aliases for <type>characte
r
<type>character(<replaceable>n</>)</type> and <type>character
varying(<replaceable>n</>)</type> and
varying(<replaceable>n</>)</type>,
<type>character(<replaceable>n</>)</type>, respectively.
respectively. <type>character</type> without length specifier is
<type>character</type> without length specifier is equivalent to
equivalent to <type>character(1)</type>; if <type>character
<type>character(1)</type>; if <type>character varying</type> is used
varying</type> is used without length specifier, the type accepts
without length specifier, the type accepts strings of any size. The
strings of any size. The
latter is a <productname>PostgreSQL</> extension.
latter is a <productname>PostgreSQL</> extension.
</para>
</para>
<para>
<para>
...
@@ -961,19 +961,18 @@ SELECT b, char_length(b) FROM test2;
...
@@ -961,19 +961,18 @@ SELECT b, char_length(b) FROM test2;
<para>
<para>
There are two other fixed-length character types in
There are two other fixed-length character types in
<productname>PostgreSQL</productname>, shown in <xref linkend="datatype-character-special-table">.
<productname>PostgreSQL</productname>, shown in <xref
The <type>name</type> type
linkend="datatype-character-special-table">. The <type>name</type>
exists <emphasis>only</emphasis> for storage of internal catalog
type exists <emphasis>only</emphasis> for storage of internal
names and is not intended for use by the general user. Its length
catalog names and is not intended for use by the general user. Its
is currently defined as 64 bytes (63 usable characters plus terminator)
length is currently defined as 64 bytes (63 usable characters plus
but should be referenced using the constant
terminator) but should be referenced using the constant
<symbol>NAMEDATALEN</symbol>. The length is set at compile time
<symbol>NAMEDATALEN</symbol>. The length is set at compile time (and
(and is therefore adjustable for special uses); the default
is therefore adjustable for special uses); the default maximum
maximum length may change in a future release. The type
length may change in a future release. The type <type>"char"</type>
<type>"char"</type> (note the quotes) is different from
(note the quotes) is different from <type>char(1)</type> in that it
<type>char(1)</type> in that it only uses one byte of storage. It
only uses one byte of storage. It is internally used in the system
is internally used in the system catalogs as a poor-man's
catalogs as a poor-man's enumeration type.
enumeration type.
</para>
</para>
<table id="datatype-character-special-table">
<table id="datatype-character-special-table">
...
...
doc/src/sgml/sql.sgml
View file @
0eed62f3
<!--
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/sql.sgml,v 1.2
7 2002/08/28 14:35:36
momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/sql.sgml,v 1.2
8 2003/01/15 18:01:05
momjian Exp $
-->
-->
<chapter id="sql">
<chapter id="sql">
...
@@ -1749,19 +1749,20 @@ CREATE TABLE SELLS
...
@@ -1749,19 +1749,20 @@ CREATE TABLE SELLS
<listitem>
<listitem>
<para>
<para>
CHAR(<replaceable class="parameter">n</replaceable>):
VAR
CHAR(<replaceable class="parameter">n</replaceable>):
fixed length character string of
length
varying length character string of maximum
length
<replaceable class="parameter">n</replaceable>.
<replaceable class="parameter">n</replaceable>.
</para>
</para>
</listitem>
</listitem>
<listitem>
<listitem>
<para>
<para>
VAR
CHAR(<replaceable class="parameter">n</replaceable>):
CHAR(<replaceable class="parameter">n</replaceable>):
varying length character string of maximum
length
fixed length character string of
length
<replaceable class="parameter">n</replaceable>.
<replaceable class="parameter">n</replaceable>.
</para>
</para>
</listitem>
</listitem>
</itemizedlist>
</itemizedlist>
</para>
</para>
</sect3>
</sect3>
...
...
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