Frequently Asked Questions (FAQ) for PostgreSQL
- Last updated: Thu Apr 18 00:44:51 EDT 2002
+ Last updated: Fri Apr 26 23:03:46 EDT 2002
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
4.4) How do you remove a column from a table?
We do not support ALTER TABLE DROP COLUMN, but 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;
4.5) What is the maximum size for a row, a table, and a database?
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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
- <P>Last updated: Thu Apr 18 00:44:51 EDT 2002</P>
+ <P>Last updated: Fri Apr 26 23:03:46 EDT 2002</P>
<P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
<P>We do not support <SMALL>ALTER TABLE DROP COLUMN,</SMALL> but 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="4.5">4.5</A>) What is the maximum size for a row, a