單行子查詢返回不止一行

Question

我收到以下錯誤：「單行子查詢返回多個行」試圖執行以下查詢：

select * 
from wm_inventory 
where item_id =(select item_cbo.item.id 
       from item_cbo 
       where item_name in ('564310','140270')); 

Answer 1

改成這樣：

select * 
from wm_inventory 
where item_id in (select item_cbo.item.id 
       from item_cbo 
       where item_name in ('564310','140270')); 

您不能爲「=」運算符返回多行。

Answer 2

錯誤非常明顯。使用in：

select i.* 
from wm_inventory i 
where i.item_id in (select item_cbo.item.id 
        from item_cbo 
        where item_name in ('564310', '140270') 
        );