From: | "Andrus" <kobruleht2(at)hot(dot)ee> |
---|---|
To: | "Melvin Davidson" <melvin6925(at)gmail(dot)com> |
Cc: | "Jim Nasby" <jim(dot)nasby(at)bluetreble(dot)com>, <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Converting char to varchar automatically |
Date: | 2014-10-08 22:21:54 |
Message-ID: | 79ED1A0744DC4A51B2C242E91D58AEED@dell2 |
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Lists: | pgsql-general |
Hi!
Thank you.
>This revised query should give you what you need:
>SELECT 'ALTER TABLE ' || quote_ident(n.nspname) || '.'
> || quote_ident(c.relname)
> || ' ALTER COLUMN ' || quote_ident(a.attname) || ' TYPE varchar(' || i.character_maximum_length || ');'
> 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
> JOIN information_schema.columns i ON (i.table_name = c.relname AND i.column_name = a.attname)
>WHERE t.typname = 'bpchar'
> AND c.relkind = 'r'
> AND n.nspname <> 'pg_catalog' and not attisdropped;
How to create single alter table command for every table ?
Can we use string concat aggregate function or window functions or plpgsql or something other ?
Andrus.
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