SQL语言是关系数据库标准语言，掌握SQL是学习和应用数据库技术的基础。通过实验可使学生了解利用数据库管理系统建立和操纵数据库的方式，更加深刻地学习和掌握SQL语言的各种功能及使用方式。

1.　　表的复杂查询：连接查询、嵌套查询、使用各种逻辑运算符的查询、查询结果的并、交、差操作等。

2.　　集函数的使用及分组子句、排序子句的使用。-SQL relational database language is standard language, to learn and master the application of SQL database technology. Experiments will enable students to understand the use of database management system to build and manipulate databases, and more profoundly to study and master the SQL language and the use of various functions. 1. Form the complexity of query: join query, nested query, using a variety of logical query operators, query results and, to pay, and poor operation. 2. Set function and the use of sub-clause, the clause used to sort.