主要介绍SQL的语法规则及在实际开发中的应用，并且对SQL在MySQL、MS SQL Server、Oracle和DB2中的差异进行了分析。《程序员的SQL金典》分为3部分：第1部分为基础篇，主要讲解数据库对增、删、改、查等SQL的支持，给出了这些SQL的应用案例；第2部分为进阶篇，讲解了函数、子查询、表连接、不同DBMS中的SQL语法差异、SQL调优、NULL值处理、事务、开窗函数等高级技术；第3部分为案例篇，对前两部分的知识进行了综合运用。-SQL syntax rules and the actual development, and SQL in MySQL, MS SQL Server, Oracle and DB2 difference. Programmers SQL Golden "is divided into three parts: Part 1 based articles, mainly on the database to add, delete, change, check SQL support, given these SQL Applications　Part 2 Advanced articles, explain the function, sub-queries, table joins, senior technical SQL syntax differences in different DBMS, SQL tuning, NULL values ​ ​ handling affairs, windowing function　part 3 for the case papers, the knowledge of the first two parts the integrated use of.