SQL：查询学习笔记
摘要：
SQL 查询命令SELECT语法SELECT "column_name"FROM "table_name";返回一列1 SELECT Username FROM Users返回多列1 SELECT Username, Password From Users返回所有列1 SELECT * FROM UsersDISTINCT语法SELECT DISTINCT "column_name"FROM "table_name";示例1 SELECT DISTINCT Name FROM UsersWHERE语法SELECT 阅读全文
posted @ 2013-12-09 15:49 幸福框架 阅读(880) 评论(0) 推荐(0) 编辑
