SEO

Hello,
is it possible to define a CHECK CONSTRAINT on a table, whereas the
CHECK-OPTION will be a SELECT.
With this CHECK CONSTRAINT i try to ensure, that there will allways a
state only set once within several rows. If possible, does someone can
provide an example ? I did not find anything in the docs.

Thanks

Joerg

joerg.sailer@weltbild.com wrote:
> Hello,
> is it possible to define a CHECK CONSTRAINT on a table, whereas the
> CHECK-OPTION will be a SELECT.
> With this CHECK CONSTRAINT i try to ensure, that there will allways a
> state only set once within several rows. If possible, does someone can
> provide an example ? I did not find anything in the docs.
Check constraints are limited to data in the row.
Have you considered using a trigger or an RI constraint?

Cheers
Serge
--
Serge Rielau
DB2 Solutions Development
IBM Toronto Lab

>> is it possible to define a CHECK CONSTRAINT on a table, whereas the CHECK-OPTION will be a SELECT. <<

A check constraint must have search condition.

>> With this CHECK CONSTRAINT i try to ensure, that there will always a state only set once within several rows. <<

That sounds like a UNIQUE constraint. Post better specifications and
we can help you.