如何使用单个查询对多列进行排序？

首先创建一个表格 –

mysql> create table DemoTable
    -> (
    ->  Id int,
    ->  Value int
    -> );
Query OK, 0 rows affected (0.68 sec)

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable values(100,85885);
Query OK, 1 row affected (0.16 sec)

mysql> insert into DemoTable values(101,885995474);
Query OK, 1 row affected (0.14 sec)

mysql> insert into DemoTable values(100,895943);
Query OK, 1 row affected (0.20 sec)

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

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输出

+------+-----------+
| Id   | Value     |
+------+-----------+
|  100 |     85885 |
|  101 | 885995474 |
|  100 |    895943 |
+------+-----------+
3 rows in set (0.00 sec)

以下是对多个列进行排序的查询-

mysql> select Id,Value from DemoTable order by Value DESC;

输出

+------+-----------+
| Id   | Value     |
+------+-----------+
|  101 | 885995474 |
|  100 |    895943 |
|  100 |     85885 |
+------+-----------+
3 rows in set (0.00 sec)