Re: Converting char to varchar automatically

Also, don't forget to test for relkind = 'r'. My bad from before.
Revised query is below.

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';

On Mon, Oct 6, 2014 at 6:18 PM, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com> wrote:

> On 10/6/14, 12:41 PM, hari(dot)fuchs(at)gmail(dot)com wrote:
>
>> Melvin Davidson <melvin6925(at)gmail(dot)com> writes:
>>
>> This query might work for you, but double check all result statements
>>> first.
>>>
>>> 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 = 'char'
>>> AND n.nspname <> 'pg_catalog';
>>>
>> Make that "t.typname = 'bpchar'".
>>
>> Just a heads-up: each of those ALTER's will rewrite the table, so unless
> your database is tiny this will be a slow process. There's ways to work
> around that, but they're significantly more complicated.
>
> --
> Jim Nasby, Data Architect, Blue Treble
> Data in Trouble? Get it in Treble! http://BlueTreble.com
>
>
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--
*Melvin Davidson*
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.