sql SQL(Structured Query Language)结构化查询语言,是一种数据库查询和程序设计语言,用于存取数据以及查询、更新和管理关系数据库系统。同时也是数据库脚本文件的扩展名-sql SQL (Structured Query Language) Structured Query Language, is a database query and programming language used to access the data and query, update and manage a relational database system. Is also a database scr ipt file extensions