如何在 MySQL "IN" 查询中保持顺序?
mysqlmysqli database
您可以借助 field 命令在 MySQL IN 查询中保持顺序。语法如下 −
select *from yourTableName anyVariableName where anyVariableName.yourColumnName in(value1,value2,......N) order by field(anyVariableName.yourColumnName,value1,value2,......N);
为了实现上述语法，让我们创建一个表 −
mysql> create table OrderInDemo −> ( −> Id int, −> Name varchar(100), −> Age int −> ); Query OK, 0 rows affected (1.24 sec)
现在让我们在表中插入一些记录。插入记录的查询如下 −
mysql> insert into OrderInDemo values(90,'David',23); Query OK, 1 row affected (0.10 sec) mysql> insert into OrderInDemo values(9,'Sam',24); Query OK, 1 row affected (0.59 sec) mysql> insert into OrderInDemo values(10,'Carol',19); Query OK, 1 row affected (0.25 sec) mysql> insert into OrderInDemo values(1,'John',26); Query OK, 1 row affected (0.42 sec) mysql> insert into OrderInDemo values(3,'Johnson',25); Query OK, 1 row affected (0.18 sec) mysql> insert into OrderInDemo values(2,'Ramit',20); Query OK, 1 row affected (0.18 sec)
使用 select 语句显示所有记录，查询如下 −
mysql> select *from OrderInDemo;
以下是输出 −
+------+---------+------+ | Id | Name | Age | +------+---------+------+ | 90 | David | 23 | | 9 | Sam | 24 | | 10 | Carol | 19 | | 1 | John | 26 | | 3 | Johnson | 25 | | 2 | Ramit | 20 | +------+---------+------+ 6 rows in set (0.00 sec)
实现我们在开始时讨论的语法，以在 MySQL IN 查询中保持顺序。查询如下 −
mysql> select *from OrderInDemo OD where OD.Id in(10,1,3) −> order by field(OD.Id,10,1,3);
以下是按查询中提供的顺序显示结果的输出 −
+------+---------+------+ | Id | Name | Age | +------+---------+------+ | 10 | Carol | 19 | | 1 | John | 26 | | 3 | Johnson | 25 | +------+---------+------+ 3 rows in set (0.00 sec)
