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MySQL Order By日期列和整数列，但是指定整数列的排序规则？可能吗？

2024-05-10 20:24:04 403

您可以借助ORDERBYCASE语句来实现。语法如下-

SELECT *FROM yourTableName ORDER BY CASE yourIntegerColumnName1 WHEN 2 THEN 1 ELSE 0 END DESC ,yourDateColumnName ASC;

为了理解上述语法，让我们创建一个表。创建表的查询如下-

mysql> create table OrderByCaseDemo
   -> (
   -> Id int NOT NULL AUTO_INCREMENT,
   -> GroupId int,
   -> ArrivalDate date,
   -> PRIMARY KEY(Id)
   -> );

使用insert命令在表中插入一些记录。查询如下-

mysql> insert into OrderByCaseDemo(GroupId,ArrivalDate) values(2,'19/02/06');
mysql> insert into OrderByCaseDemo(GroupId,ArrivalDate) values(1,'20/02/06');
mysql> insert into OrderByCaseDemo(GroupId,ArrivalDate) values(3,'18/02/06');
mysql> insert into OrderByCaseDemo(GroupId,ArrivalDate) values(3,'21/02/06');
mysql> insert into OrderByCaseDemo(GroupId,ArrivalDate) values(2,'17/02/06');
mysql> insert into OrderByCaseDemo(GroupId,ArrivalDate) values(1,'22/02/06');

使用select语句显示表中的所有记录。查询如下-

mysql> select *from OrderByCaseDemo;

以下是输出-

+----+---------+-------------+
| Id | GroupId | ArrivalDate |
+----+---------+-------------+
|  1 |       2 | 2019-02-06  |
|  2 |       1 | 2020-02-06  |
|  3 |       3 | 2018-02-06  |
|  4 |       3 | 2021-02-06  |
|  5 |       2 | 2017-02-06  |
|  6 |       1 | 2022-02-06  | 
+----+---------+-------------+
6 rows in set (0.00 sec)

这是按日期排序的查询列以及整数列-

mysql> select *from OrderByCaseDemo order by case GroupId when 2 then 1 else 0 end desc,ArrivalDate asc;

以下是输出-

+----+---------+-------------+
| Id | GroupId | ArrivalDate |
+----+---------+-------------+
|  5 |       2 | 2017-02-06  |
|  1 |       2 | 2019-02-06  |
|  3 |       3 | 2018-02-06  |
|  2 |       1 | 2020-02-06  |
|  4 |       3 | 2021-02-06  |
|  6 |       1 | 2022-02-06  |
+----+---------+-------------+
6 rows in set (0.00 sec)

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MySQL Order By日期列和整数列，但是指定整数列的排序规则？可能吗？

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