2011年6月22日
Sql的一些概念
摘要： DDL: Data Definition Language ,deals with object definitions and includes statements such as CREATE, ALTER, and DROP.DML : Data Manipulation Language ,allows you to query and modify data and includes statements such as SELECT, INSERT, UPDATE, DELETE, and MERGE.DCL : Data Control Language ,deals with 阅读全文
posted @ 2011-06-22 14:20 HelloWorld.Michael 阅读(158) 评论(0) 推荐(0)