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Update DROP COLUMN example to use transactions and rollback-able DROP TABLE>

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Bruce Momjian 2002-04-27 03:04:08 +00:00
parent 97b6e3f06f
commit aafe72efb2
2 changed files with 8 additions and 2 deletions
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doc/FAQ
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Frequently Asked Questions (FAQ) for PostgreSQL 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) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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4.4) How do you remove a column from a table? 4.4) How do you remove a column from a table?
We do not support ALTER TABLE DROP COLUMN, but do this: 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 SELECT ... -- select all columns but the one you want to remove
INTO TABLE new_table INTO TABLE new_table
FROM old_table; FROM old_table;
DROP TABLE old_table; DROP TABLE old_table;
ALTER TABLE new_table RENAME TO 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? 4.5) What is the maximum size for a row, a table, and a database?

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doc/src/FAQ/FAQ.html
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alink="#0000ff"> alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> <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= <P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR> "mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
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<P>We do not support <SMALL>ALTER TABLE DROP COLUMN,</SMALL> but do <P>We do not support <SMALL>ALTER TABLE DROP COLUMN,</SMALL> but do
this:</P> this:</P>
<PRE> <PRE>
BEGIN;
LOCK TABLE old_table;
SELECT ... -- select all columns but the one you want to remove SELECT ... -- select all columns but the one you want to remove
INTO TABLE new_table INTO TABLE new_table
FROM old_table; FROM old_table;
DROP TABLE old_table; DROP TABLE old_table;
ALTER TABLE new_table RENAME TO old_table; ALTER TABLE new_table RENAME TO old_table;
COMMIT;
</PRE> </PRE>
<H4><A name="4.5">4.5</A>) What is the maximum size for a row, a <H4><A name="4.5">4.5</A>) What is the maximum size for a row, a