The paper holds that relational database sets up connection between tables in the database. And once the tables are connected, they can work coordinately to solve practical problems. In database operation, multiple tables can accomplish assigned tasks coordinately. The paper specifies how it can be used in daily work.%数据库的多表操作是指多个表协同完成指定的任务，这种现象在实际工作中经常用到。关系数据库的特点是可以为表建立表间关系，如果两个表之间具有某种关联，就可以协同起来，解决很多实际问题。
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