I have a schema which has 6 different types of entities, but they all have a lot of things in common. I figured I could probably abstract a lot of this commonality out at the type level, but I've h...

Making a ternary logic table, and I would like to make my own function for an operator that I'll call <=>. So, for example, I want to do this, but that isn't right. what's the correct way t...

Suppose that I have the following (PostgreSQL) table definition: CREATE TABLE books ( id serial NOT NULL, title character varying NOT NULL, PRIMARY KEY (id) ); And the following record defin...