Re: Converting char to varchar automatically

On 10/6/14, 12:41 PM, hari.fuchs@gmail.com wrote:

Melvin Davidson <melvin6925@gmail.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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