错误与嵌套查询

Question

这是我的查询：

SELECT id, DeviceName, DeviceTypeId 
FROM device 
WHERE DeviceTypeId LIKE (SELECT DeviceId FROM net_backupdevice WHERE CustomerId = '1'); 

以下错误显示

执行之后。

ERROR 1242（21000）：子查询返回多个1行

此表net_backupdevice返回2条记录，我想都记录信息的ID，设备名称，DeviceTypeId存储在设备表。

所以请大家帮忙。

Answer 1

SELECT id, DeviceName, DeviceTypeId FROM device WHERE DeviceTypeId IN (select DeviceId from net_backupdevice where CustomerId = '1'); 

请注意，而不是像

的IN

Answer 2

最简单的解决

SELECT id, DeviceName, DeviceTypeId 
FROM device 
WHERE DeviceTypeId IN (select DeviceId from net_backupdevice where CustomerId = '1'); 

也许这是一个正确的版本

SELECT id, DeviceName, DeviceTypeId 
FROM device d inner join net_backupdevice nb on d.DeviceTypeId = nb.DeviceId 
WHERE nb.CustomerId = 1;