錯誤與嵌套查詢

Question

這是我的查詢：

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

以下錯誤顯示

執行之後。

ERROR 1242（21000）：子查詢返回多個1行

此表net_backupdevice返回2條記錄，我想都記錄信息的ID，設備名稱，DeviceTypeId存儲在設備表。

所以請大家幫忙。

Answer 1

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

請注意，而不是像

的IN

Answer 2

最簡單的解決

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

也許這是一個正確的版本

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