Well, that's your opinion, Boudjakdji.

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If you don't see what wrong in the absurd results returned by the queries, I am afraid I can not do much for you.

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If you have...

DO NOT PUT NULL VALUES IN THE FIRST PLACE IN YOUR DB.

IGNORE THE WRITER'S ARTICLE.

Obviously the article is posted by somebody who has no clue about database fundamental theory....The writer just made up the *Four Rules* to make it sound scientific but in fact,...