Re: Converting char to varchar automatically

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
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