I have a foreign key constraint that I created to reference the primary key of another table:<BR><BR><pre class="ip-ubbcode-code-pre">constraint geneassay_fk foreign ...

Occasionally one sees an entity-relationship diagram (ERD) having an unusual characteristic. The unusual element is an entity (or more than one) that seems to have a relationship with every other ...

I'm working on a web app, and it part of it, there is a very simple database-driven file/document manager. As a file manager, there is the possibility of sub-folders. So in the DB, I have the ...