sql server - Good books or sites for advanced SQL queries or puzzles? -

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I work with SQL daily and want to improve my SQL skills. I am looking for online resources or books for advanced questions for real life problems, which I liked for Celco's books and I am looking for similar resources. I am also interested in SQL puzzles, but who solve real life business apps I'm not like the problems of brain teasers, chess, games, cards, and SQL which look too complex or too vague.

I want to learn how to use SQL with less floating tables and more sophisticated, subqueries .. etc ..

I tested resources from a similar SO question, but I did not find them very useful and expected that there was a need for others. Celco's books refer to different ways of the same problem and I find it very informative and open the eye. I want more!

I like the following book:


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