Help me good SQL Ebooks [closed]

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I have basic knowledge about SQL. But I still have difficulty when write SQL for the complex queries. Please help me some ebooks to improve my skill to write SQL, and the way to write a good SQL for performance.

The book should have example database to practice.

Thanks.

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If you have an iPhone, you can buy many excellent SQL Server books through the AppStore. Do a search for SQL, and you'll find books by Kalen Delaney and the like.