SQL多表查询应用探讨  

Discussion on Application of SQL Multi-table Query

作　　者：宋素荣 

机构地区：[1]郑州市科技中等专业学校,郑州450008

出　　处：《价值工程》2012年第16期169-169,共1页Value Engineering

摘　　要：数据库检索速度的快慢一直是数据库开发和应用人员关注的焦点,影响它的一个重要因素就是SQL查询语句效率的高低,而在SQL查询语句中多表查询的使用频率非常高,最能体现查询的复杂性,也是SQL查询语句的重点与难点。The retrieval speed of database has been the focus of attention of database development and application staff,and an important factor affecting retrieval speed is SQL query efficiency.Frequency of utilization of multi-table query in the SQL query is very high,which can most embody complexity,and it is also the emphasis and difficulty of SQL query.

关 键 词：SQL 多表查询 联接查询 子查询 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]