Follow this step-by-step guide to install PostgreSQL, load data, connect to a database, and execute SQL queries including table joins PostgreSQL is an open-source, object-relational (also called ...

Hi all! I'm creating an access policy to be used among some of my contracts, and I want to re-use the same policy for some of them. I'm able to create the policy with ...

I think the logic is too complicated for a CHECK constraint, and I haven't managed to get a user-defined function to work it that context so it may not be possible that way.

I've got an interesting constraint I'm trying to add to our database. I can do with with triggers, but am curious if there is a more elegant way to do this in T-SQL (SQL2005, FWIW) We have two related ...