摘要: mysql 查询语句 select * from school; 指定查询列 select id,name from school; 起别名 select id,name as 姓名,sex as 性别,age as 年龄 from student; 去重查询 select distinct sex 阅读全文
posted @ 2021-07-07 01:31 胡勇健 阅读(156) 评论(0) 推荐(0)