From: | "Andrus" <kobruleht2(at)hot(dot)ee> |
---|---|
To: | <jim(dot)nasby(at)bluetreble(dot)com>, <melvin6925(at)gmail(dot)com> |
Cc: | <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Converting char to varchar automatically |
Date: | 2014-10-08 19:34:56 |
Message-ID: | 9CDA39C9CFD1404FA57F9A2B61BAC62B@dell2 |
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Thread: | |
Lists: | pgsql-general |
Hi!
Using Toms recommendation I added not attisdropped and now got the query
SELECT 'ALTER TABLE ' || quote_ident(n.nspname) || '.'
|| quote_ident(c.relname)
|| ' ALTER COLUMN ' || quote_ident(a.attname) || ' TYPE
varchar;'
FROM pg_class c
JOIN pg_namespace n ON n.oid = c.relnamespace
JOIN pg_attribute a ON a.attrelid = c.oid
JOIN pg_type t ON t.oid = a.atttypid
WHERE t.typname = 'bpchar'
AND c.relkind = 'r'
AND n.nspname <> 'pg_catalog' and not attisdropped;
Will this create commands which replace all user-defined char things in
database to varchar ?
"TYPE varchar" creates single character column so most alter table command
will fail.
How to change this so that original char column width is kept ?
I looked into tables used in this query but havent found column which holds
char column defined width.
How get it or is it better to re-write this query using informational_schema
?
How to change this query so that it creates single alter table command for
every table
(with multiple alter column clauses) to increase conversion speed ?
Andrus.
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