嵌套查询出错

Question

这是我的疑问：

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

执行错误后显示

。

  

错误1242（21000）：子查询返回超过1行

此表net_backupdevice返回2条记录，我希望记录信息id，DeviceName，DeviceTypeId存储在设备表中。

所以请帮忙。

Answer 1

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

请注意IN而不是Like

Answer 2

最简单的修复

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

可能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;