摘要: 一、基本查询语句及方法补充 1.concat_ws 拼接多个 select concat(name,":",age,":",post,":",salary) from emp; select concat_ws(':',name,age,post,salary) from emp; 上述语句完全等价 阅读全文
posted @ 2019-08-22 20:24 Francis` 阅读(307) 评论(0) 推荐(0) 编辑