From: | "Andrus" <kobruleht2(at)hot(dot)ee> |
---|---|
To: | "Jim Nasby" <Jim(dot)Nasby(at)BlueTreble(dot)com>, "Melvin Davidson" <melvin6925(at)gmail(dot)com> |
Cc: | <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Converting char to varchar automatically |
Date: | 2014-11-01 20:02:31 |
Message-ID: | B0A064BAC79A49BAA4102FC017093ED5@dell2 |
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Thread: | |
Lists: | pgsql-general |
Hi!
> That looks sane, though you didn't need the WITH.
I changed select to code below.
If same table name appears in multiple schemas, it generates duplicate alter
column clauses which cause error.
How to fix it to generate proper sql ?
I added n.nspname='myschame' as shown in code below but problem persists.
Andrus.
SELECT 'ALTER TABLE ' || quote_ident(n.nspname) || '.'
|| quote_ident(c.relname) || ' ' ||
string_agg(
' ALTER COLUMN ' || quote_ident(a.attname) || ' TYPE varchar(' ||
i.character_maximum_length ||')',
',' ) || ';' as statement
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
and n.nspname='myschema'
group by n.nspname, c.relname
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