Oh I forgot to add, the rules of relational database are exactly what CODD said they are because CODD invented them and said "I define the relational model to b

Oh I forgot to add, the rules of relational database are exactly what CODD said they are because CODD invented them and said "I define the relational model to be this" What they are NOT is what you, Chris Date and Fabian Pascal want them to be. And no-one is going to use Tutorial-D ever, so it's about time you made your peace with SQL.