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                ### 6.1、單一字段排序 排序采用order by子句,order by后面跟上排序字段,排序字段可以放多個,多個采用逗號間隔,order by默認采用升序,如果存在where子句那么order by必須放到where語句的后面 正序:從小到大 反序:從大到小 時間戳:從互聯網元年0天0時0分0秒0毫秒0微妙到到此刻的時間 l 按照薪水由小到大排序(系統默認由小到大) ``` select * from emp order by sal; ``` ![](https://img.kancloud.cn/90/e6/90e6e6d2586dd75cb19accf30fbfe5fa_643x327.png) l 取得job為MANAGER的員工,按照薪水由小到大排序(系統默認由小到大) ``` select * from emp where job='MANAGER' order by sal; ``` ![](https://img.kancloud.cn/c0/d7/c0d73f075025d3149dbb700bf2071e03_624x156.png) 如果包含where語句order by必須放到where后面,如果沒有where語句order by放到表的后面 以下寫法是錯誤的: ``` select * from emp order by sal where job='MANAGER'; ``` l 按照多個字段排序,如:首先按照job排序,再按照sal排序 ``` select * from emp order by job,sal; ``` ![](https://img.kancloud.cn/36/ee/36eef7c6e52f234925d5842d16ba6077_641x327.png)
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