Re: ALTER TABLE

> work=# ALTER TABLE rdu ADD CONSTRAINT rdu_finish_time CHECK ((start_time <=
> finish_time) OR finish_time IS NULL);
> ERROR:  AlterTableAddConstraint: rejected due to CHECK constraint
> rdu_finish_time

I can say that the field, finish_time have the values which conflict with
the check constraint you define. ie.. Records exist with start_time
> finish_time, so update the records and try.

regards,
bhuvaneswaran