SQL查询语句优化研究

Study on The Optimization Methods for SQL(Structured Query Language)

在关系数据库系统中,结构化查询语言(SQL)的查询效率一直是人们关注的焦点。首先分析了SQL优化的可行性,然后研究了SQL的优化原理,最后给出了几种SQL优化方法。

SQL（structured query language） efficiency is the key factor in the relational data base management system（RDBMS）. The feasibility of SQL optimization is analyzed,optimization principle is studied and optimization methods are given in the paper.