MySQL：条件ORDER BY只有一列

您好,感谢您花时间阅读此问题.

我正在使用MySQL,我想使用ORDER BY将结果排序到一个特定列,但结果必须根据特定条件对此列进行排序.例如,在下表中,我想ORDER BY’group’,首先显示9,7,6’组’项目,最后显示10,8,5’组’项目：

names     group
--------- ------
susanita  10
miguelito 5
mafalda   7
manolito  8
libertad  6
felipe    9
guille    8

提前致谢.

解决方法:

SELECT* FROM mytable ORDER BY
LOCATE(CONCAT('.',`group`,'.'),'.9.7.6.10.8.5.');

我拿了你的样本数据,把它加载到名为mytable的表中并运行它.

结果如下：

mysql> use test
Database changed
mysql> drop table if exists mytable;
Query OK, 0 rows affected (0.04 sec)

mysql> create table mytable
    -> (
    ->    names varchar(10),
    ->    `group` int
    -> );
Query OK, 0 rows affected (0.08 sec)

mysql> insert into mytable values
    -> ('susanita',  10),
    -> ('miguelito', 5),
    -> ('mafalda',   7),
    -> ('manolito',  8),
    -> ('libertad',  6),
    -> ('felipe',    9),
    -> ('guille',    8);
Query OK, 7 rows affected (0.09 sec)
Records: 7  Duplicates: 0  Warnings: 0

mysql> SELECT * FROM mytable;
+-----------+-------+
| names     | group |
+-----------+-------+
| susanita  |    10 |
| miguelito |     5 |
| mafalda   |     7 |
| manolito  |     8 |
| libertad  |     6 |
| felipe    |     9 |
| guille    |     8 |
+-----------+-------+
7 rows in set (0.00 sec)

mysql> SELECT * FROM mytable ORDER BY
    -> LOCATE(CONCAT('.',`group`,'.'),'.9.7.6.10.8.5.');
+-----------+-------+
| names     | group |
+-----------+-------+
| felipe    |     9 |
| mafalda   |     7 |
| libertad  |     6 |
| susanita  |    10 |
| manolito  |     8 |
| guille    |     8 |
| miguelito |     5 |
+-----------+-------+
7 rows in set (0.01 sec)

mysql>

试试看 ！！！

更新2011-09-06 12:33美国东部时间

这是另一种方法：

SELECT* FROM mytable ORDER BY
IF(FIELD(`group`,9,7,6,10,8,5)=0,99999,FIELD(`group`,9,7,6,10,8,5));

这将强制除了9,7,6,10,8,5之外的任何组出现在查询的最底部.

更新2011-09-06 14:39美国东部时间

mysql> SELECT names, `group`
    -> FROM mytable
    -> WHERE `group` IN (9,7,6,10,8,5)
    -> ORDER BY find_in_set(`group`,'9,7,6,10,8,5');
+-----------+-------+
| names     | group |
+-----------+-------+
| felipe    |     9 |
| mafalda   |     7 |
| libertad  |     6 |
| susanita  |    10 |
| manolito  |     8 |
| guille    |     8 |
| miguelito |     5 |
+-----------+-------+
7 rows in set (0.00 sec)

嘿@Nick,你的样本数据也不错!!!

标签：mysql,condition,order-by
来源： https://codeday.me/bug/20190806/1599204.html