I’ve just added Toon Koppelaars to my blog roll – and this is just a temporary note to highlight the addition.
The blog is “Triggers considered harmful, considered harmful” (and the near-quine is deliberate). It is a series of articles presenting and expanding on the presentations that Toon has given in the past at events like the Hotsos Symposium; and, eventually, will explain how we can implement all the necessary levels of constraints that allow a relational database implemented in Oracle to guarantee correct data.
Toon (along with Lex De Haan (RIP)) wrote Applied Mathematics for Database Professionals which is one of the very few books I’ve reviewed at Amazon (UK). He’s a very good writer with some very important ideas that he explains very well. If you need an explanation about the “necessary levels of constraints”, I list them all in my review.