Re: unique index with bool

tmpmac@mac.com wrote:
> CREATE UNIQUE INDEX name on table(param1,param2);
> 
> How to create such unique index when param2 is bool type, and this
> param2 should be accepted only in case of true ?
> 
> I tried: CREATE UNIQUE INDEX name on table(param1,(param2 = 'true'));
>  but it's not working.

Something like:

CREATE UNIQUE INDEX my_uniq_idx ON table(param1,param2)

ALTER TABLE table ADD CONSTRAINT my_constraint CHECK (param2='' OR 
param1=true);

So - separate out the test linking param1/param2 from your uniqueness 
requirement.
-- 
   Richard Huxton
   Archonet Ltd