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Postgres FD Implementation
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Abuhujair Javed
Postgres FD Implementation
Commits
2ccf79a6
Commit
2ccf79a6
authored
Feb 01, 2005
by
Bruce Momjian
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Remove FAQ mention of DROP column.
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25deba31
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doc/src/FAQ/FAQ.html
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doc/FAQ
View file @
2ccf79a6
Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Mon Jan 31 20:
35:58
EST 2005
Last updated: Mon Jan 31 20:
41:21
EST 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
...
...
@@ -51,7 +51,7 @@
4.1) How do I SELECT only the first few rows of a query? A random row?
4.2) How do I find out what tables, indexes, databases, and users are
defined? How do I see the queries used by psql to display them?
4.3) How do you
remove a column from a table, or change it
s data type?
4.3) How do you
change a column'
s data type?
4.4) What is the maximum size for a row, a table, and a database?
4.5) How much database disk space is required to store data from a
typical text file?
...
...
@@ -491,25 +491,16 @@
query to get information about the database.
There are also system tables beginning with pg_ that describe these
too. Use psql -l will list all databases.
too.
Use psql -l will list all databases.
Also try the file pgsql/src/tutorial/syscat.source. It illustrates
many of the SELECTs needed to get information from the database system
tables.
4.3) How do you
remove a column from a table, or change it
s data type?
4.3) How do you
change a column'
s data type?
DROP COLUMN functionality was added in release 7.3 with ALTER TABLE
DROP COLUMN. In earlier versions, you can do this:
BEGIN;
LOCK TABLE old_table;
SELECT ... -- select all columns but the one you want to remove
INTO TABLE new_table
FROM old_table;
DROP TABLE old_table;
ALTER TABLE new_table RENAME TO old_table;
COMMIT;
Changing the data type of a column can be done easily in 8.0 and later
with ALTER TABLE ALTER COLUMN TYPE.
...
...
doc/src/FAQ/FAQ.html
View file @
2ccf79a6
...
...
@@ -10,7 +10,7 @@
alink=
"#0000ff"
>
<H1>
Frequently Asked Questions (FAQ) for PostgreSQL
</H1>
<P>
Last updated: Mon Jan 31 20:
35:58
EST 2005
</P>
<P>
Last updated: Mon Jan 31 20:
41:21
EST 2005
</P>
<P>
Current maintainer: Bruce Momjian (
<A
href=
"mailto:pgman@candle.pha.pa.us"
>
pgman@candle.pha.pa.us
</A>
)
...
...
@@ -74,8 +74,7 @@
<A
href=
"#4.2"
>
4.2
</A>
) How do I find out what tables, indexes,
databases, and users are defined? How do I see the queries used
by
<I>
psql
</I>
to display them?
<BR>
<A
href=
"#4.3"
>
4.3
</A>
) How do you remove a column from a
table, or change its data type?
<BR>
<A
href=
"#4.3"
>
4.3
</A>
) How do you change a column's data type?
<BR>
<A
href=
"#4.4"
>
4.4
</A>
) What is the maximum size for a row, a
table, and a database?
<BR>
<A
href=
"#4.5"
>
4.5
</A>
) How much database disk space is required
...
...
@@ -645,28 +644,15 @@
database.
</P>
<P>
There are also system tables beginning with
<I>
pg_
</I>
that describe
these too. Use
<I>
psql -l
</I>
will list all databases.
</P>
these too.
</P>
<P>
Use
<I>
psql -l
</I>
will list all databases.
</P>
<P>
Also try the file
<I>
pgsql/src/tutorial/syscat.source
</I>
. It
illustrates many of the
<SMALL>
SELECT
</SMALL>
s needed to get
information from the database system tables.
</P>
<H4><A
name=
"4.3"
>
4.3
</A>
) How do you remove a column from a
table, or change its data type?
</H4>
<P><SMALL>
DROP COLUMN
</SMALL>
functionality was added in release 7.3
with
<SMALL>
ALTER TABLE DROP COLUMN
</SMALL>
. In earlier versions,
you can do this:
</P>
<PRE>
BEGIN;
LOCK TABLE old_table;
SELECT ... -- select all columns but the one you want to remove
INTO TABLE new_table
FROM old_table;
DROP TABLE old_table;
ALTER TABLE new_table RENAME TO old_table;
COMMIT;
</PRE>
<H4><A
name=
"4.3"
>
4.3
</A>
) How do you change a column's data type?
</H4>
<P>
Changing the data type of a column can be done easily in 8.0
and later with
<SMALL>
ALTER TABLE ALTER COLUMN TYPE
</SMALL>
.
...
...
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