Title: SQL进阶 Download
Description: The first chapter is practice, a large number of SQL code, read 2 days at a time, has come to 330 pages. The second chapter is about theory, which mainly deals with the history of relational database, the origin of set theory, predicate logic and ternary logic. It may take two months, two years or 20 years to understand deeply. The third chapter is the appendix, detailed exercise solutions.
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