在MySQL select语句IN子句中按值顺序排序?
您可以将field()
函数与ORDER BY子句一起使用,以按值顺序排序。语法如下
SELECT *FROM yourTableNameWHERE yourColumnName IN(Value1,Value2,Value3,.......N);
ORDER BY FIELD(yourColumnName ,Value1,Value2,Value3,.......N);
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 SelectInDemo-> (
-> StudentId int,
-> StudentName varchar(100),
-> StudentAge int
-> );
使用insert命令在表中插入记录。查询如下
mysql> insert into SelectInDemo values(1,'Mike',23);mysql> insert into SelectInDemo values(10,'Bob',21);
mysql> insert into SelectInDemo values(11,'Carol',30);
mysql> insert into SelectInDemo values(15,'Sam',24);
mysql> insert into SelectInDemo values(20,'John',26);
mysql> insert into SelectInDemo values(101,'David',27);
mysql> insert into SelectInDemo values(96,'Justin',23);
使用select语句显示表中的所有记录。查询如下
mysql> select *from SelectInDemo;
以下是输出
+-----------+-------------+------------+| StudentId | StudentName | StudentAge |
+-----------+-------------+------------+
| 1 | Mike | 23 |
| 10 | Bob | 21 |
| 11 | Carol | 30 |
| 15 | Sam | 24 |
| 20 | John | 26 |
| 101 | David | 27 |
| 96 | Justin | 23 |
+-----------+-------------+------------+
7 rows in set (0.00 sec)
这是在MySQL中将IN与SELECT语句一起使用的查询
mysql> select *from SelectInDemo-> where StudentId IN(1,96,101,10,15,11,20)
-> order by field(StudentId,1,96,101,10,15,11,20);
以下是输出
+-----------+-------------+------------+| StudentId | StudentName | StudentAge |
+-----------+-------------+------------+
| 1 | Mike | 23 |
| 96 | Justin | 23 |
| 101 | David | 27 |
| 10 | Bob | 21 |
| 15 | Sam | 24 |
| 11 | Carol | 30 |
| 20 | John | 26 |
+-----------+-------------+------------+
7 rows in set (0.00 sec)
让我们看看另一个订单。
对于二阶查询如下。
mysql> select *from SelectInDemo-> where StudentId IN(1,10,11,15,20,101,96)
-> order by field(StudentId,1,10,11,15,20,101,96);
以下是outpu
+-----------+-------------+------------+| StudentId | StudentName | StudentAge |
+-----------+-------------+------------+
| 1 | Mike | 23 |
| 10 | Bob | 21 |
| 11 | Carol | 30 |
| 15 | Sam | 24 |
| 20 | John | 26 |
| 101 | David | 27 |
| 96 | Justin | 23 |
+-----------+-------------+------------+
7 rows in set (0.00 sec)
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