July 2007 - Posts

• A Better Developer in 6 months? Deal!

  It's all the fault of Denis Gobo . He tagged me , and now I feel obliged to publish my plans for the last half of 2007 as well. I am not quite as ambitious as Denis, though. My first commitment Like Denis, I will read more technical books. I have a huge Read More... Posted Wednesday, July 18, 2007 1:08 AM by Hugo Kornelis | 10 Comments Filed under: Personal, Books

• The logic of three-valued logic

  In my previous post , I explained what NULL does and does not mean, how and why the rule of NULL propagation forces any expression involving NULL to result in NULL. I also mentioned that comparisons involving NULL do not result in NULL but, rather, in Read More... Posted Tuesday, July 17, 2007 11:58 PM by Hugo Kornelis | 6 Comments Filed under: T-SQL, Database theory, NULL

• NULL - The database's black hole

  I once read a scientific article on black holes that started of on the observation that, since a hole is the absence of anything and black is invisible in space, a black hole is in fact an invisible nothing – so what the heck are we talking about? Well, Read More... Posted Friday, July 06, 2007 12:20 AM by Hugo Kornelis | 24 Comments Filed under: T-SQL, Database theory, NULL