From 2ccf79a6a16728911602d48c7bfc661e759d20e3 Mon Sep 17 00:00:00 2001 From: Bruce Momjian Date: Tue, 1 Feb 2005 01:41:37 +0000 Subject: [PATCH] Remove FAQ mention of DROP column. --- doc/FAQ | 21 ++++++--------------- doc/src/FAQ/FAQ.html | 26 ++++++-------------------- 2 files changed, 12 insertions(+), 35 deletions(-) diff --git a/doc/FAQ b/doc/FAQ index c092e10b9c..3c35b3c2ec 100644 --- a/doc/FAQ +++ b/doc/FAQ @@ -1,7 +1,7 @@ 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 its 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 its 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. diff --git a/doc/src/FAQ/FAQ.html b/doc/src/FAQ/FAQ.html index 1385d59012..71fd857710 100644 --- a/doc/src/FAQ/FAQ.html +++ b/doc/src/FAQ/FAQ.html @@ -10,7 +10,7 @@ alink="#0000ff">

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) @@ -74,8 +74,7 @@ 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 its 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 @@ -645,28 +644,15 @@ database.

There are also system tables beginning with pg_ that describe - these too. Use psql -l will list all databases.

+ these 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 its 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;
-
+

4.3) How do you change a column's data type?

Changing the data type of a column can be done easily in 8.0 and later with ALTER TABLE ALTER COLUMN TYPE. -- 2.40.0