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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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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)
@ -690,7 +690,10 @@ log_*
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);