一.介绍众所周知，结构化查询语言（SQL）是一种数据库语言，通过它我们可以对现有数据库进行某些操作，也可以使用这种语言来创建数据库。通常SQL 是使用命令来执行所需的任务，比如 Create、Drop、Insert 等相关命令，而这些命令主要又分为五类，分别如下： 1. DDL——数据定义语言； 2. DQl —— 数据查询语言； 3. DML——数据操作语言； 4. DCL —....

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更新时间 2024-03-04 10:15:50

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