【19-19】数据排序
2022-02-10 21:16:00 # MySQL

语法格式

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select
    字段...
from 
    表名
where
    条件
order by 字段 asc/desc;

查询员工工资按照升序/降序

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mysql> select ename,sal from emp order by sal asc;
+--------+---------+
| ename  | sal     |
+--------+---------+
| SMITH  |  800.00 |
| JAMES  |  950.00 |
| ADAMS  | 1100.00 |
| WARD   | 1250.00 |
| MARTIN | 1250.00 |
| MILLER | 1300.00 |
| TURNER | 1500.00 |
| ALLEN  | 1600.00 |
| CLARK  | 2450.00 |
| BLAKE  | 2850.00 |
| JONES  | 2975.00 |
| SCOTT  | 3000.00 |
| FORD   | 3000.00 |
| KING   | 5000.00 |
+--------+---------+
14 rows in set (0.00 sec)

mysql> select ename,sal from emp order by sal desc;
+--------+---------+
| ename  | sal     |
+--------+---------+
| KING   | 5000.00 |
| SCOTT  | 3000.00 |
| FORD   | 3000.00 |
| JONES  | 2975.00 |
| BLAKE  | 2850.00 |
| CLARK  | 2450.00 |
| ALLEN  | 1600.00 |
| TURNER | 1500.00 |
| MILLER | 1300.00 |
| WARD   | 1250.00 |
| MARTIN | 1250.00 |
| ADAMS  | 1100.00 |
| JAMES  |  950.00 |
| SMITH  |  800.00 |
+--------+---------+
14 rows in set (0.00 sec)

'2' 代表按照第二列  
mysql> select ename,sal from emp order by 2 asc;
+--------+---------+
| ename  | sal     |
+--------+---------+
| SMITH  |  800.00 |
| JAMES  |  950.00 |
| ADAMS  | 1100.00 |
| WARD   | 1250.00 |
| MARTIN | 1250.00 |
| MILLER | 1300.00 |
| TURNER | 1500.00 |
| ALLEN  | 1600.00 |
| CLARK  | 2450.00 |
| BLAKE  | 2850.00 |
| JONES  | 2975.00 |
| SCOTT  | 3000.00 |
| FORD   | 3000.00 |
| KING   | 5000.00 |
+--------+---------+
14 rows in set (0.00 sec)

按照工资升序工资一样按名字降序排序

先按字段1，再按字段2 

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select 字段 from 表 order by 字段1 desc, 字段2 asc, ...;
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mysql> select ename,sal from emp order by sal desc, ename asc;
+--------+---------+
| ename  | sal     |
+--------+---------+
| KING   | 5000.00 |
| FORD   | 3000.00 |
| SCOTT  | 3000.00 |
| JONES  | 2975.00 |
| BLAKE  | 2850.00 |
| CLARK  | 2450.00 |
| ALLEN  | 1600.00 |
| TURNER | 1500.00 |
| MILLER | 1300.00 |
| MARTIN | 1250.00 |
| WARD   | 1250.00 |
| ADAMS  | 1100.00 |
| JAMES  |  950.00 |
| SMITH  |  800.00 |
+--------+---------+
14 rows in set (0.00 sec)

查找岗位是SALSMAN要求按照薪资降序排列

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mysql> select ename,job,sal from emp where job = 'SALESMAN' order by sal desc;
+--------+----------+---------+
| ename  | job      | sal     |
+--------+----------+---------+
| ALLEN  | SALESMAN | 1600.00 |
| TURNER | SALESMAN | 1500.00 |
| WARD   | SALESMAN | 1250.00 |
| MARTIN | SALESMAN | 1250.00 |
+--------+----------+---------+
4 rows in set (0.00 sec)

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2022-02-10 21:16:00 # MySQL
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