2020.8.13课堂笔记（DQL查询数据）

中括号代表可选，大括号代表至少有一条 最简单的 select * from tablename; mysql> select stu_name as ‘学生姓名’,gender as ‘性别’,address ‘地址’,email ‘邮箱’ from student; mysql> select s.stu_name as ‘学生姓名’,s.gender as ‘性别’,s.address ‘地址

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