Re: Changing colums type

> Hi,
>
> I would like to change column type from int8 to int4 in psql command
> line utility. I am run command ALTER TABLE blah blah blah, but nothing
> happens. No error message and no change of column type. Anyone have a
> clue what is happening?

Way 1:

=> BEGIN;
=> ALTER TABLE my_table ADD COLUMN new_column int4;
=> UPDATE my_table SET new_column = old_column;
=> ALTER TABLE my_table DROP COLUMN old_column;
=> COMMIT;

Way 2:

=# BEGIN;
=# UPDATE pg_attribute SET atttypid = pg_type.oid WHERE attrelid =
pg_class.oid AND pg_class.relnamespace = pg_namespace.oid AND
pg_namespace.nspname = 'my_schema' AND pg_class.relname = 'my_table' AND
pg_attribute.attname = 'my_column' AND pg_type.typname = 'int4';
=# COMMIT;

Hope it helps.

regards,
bhuvaneswaran