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Mention ALTER COLUMN TYPE in FAQ.

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Bruce Momjian 2005-01-17 03:02:56 +00:00
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doc/FAQ
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Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Sun Jan 16 21:40:18 EST 2005
Last updated: Sun Jan 16 22:01:06 EST 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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ALTER TABLE new_table RENAME TO old_table;
COMMIT;
To change the data type of a column, do this:
Changing the data type of a column can be done easily in 8.0 and later
with ALTER TABLE ALTER COLUMN TYPE.
In earlier releases, do this:
BEGIN;
ALTER TABLE tab ADD COLUMN new_col new_data_type;
UPDATE tab SET new_col = CAST(old_col AS new_data_type);

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doc/src/FAQ/FAQ.html
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alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Sun Jan 16 21:40:18 EST 2005</P>
<P>Last updated: Sun Jan 16 22:01:06 EST 2005</P>
<P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
@ -854,8 +854,8 @@
<H4><A name="4.4">4.4</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,
<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;
@ -868,7 +868,10 @@
COMMIT;
</PRE>
<P>To change the data type of a column, do this:</P>
<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>.
<P>In earlier releases, do this:</P>
<PRE>
BEGIN;
ALTER TABLE tab ADD COLUMN new_col <i>new_data_type</i>;