Mysql加入查询运行结果中的错误

Question

编辑：I have a mysql table for items in and items out displayed as follows

当我运行以下查询以显示输入的项目数和拍摄的项目时，我得到以下结果。

Results after running the query

查询如下：

SELECT DISTINCT ii.item_in_nme 'Items In'
              , SUM(ii.item_in_quantity) 'Quantity In'
              , io.item_out_nme 'Items Taken'
              , SUM(item_out_quantity) 'Quantity Taken'
              , item_taken_by 'Taken By'
              , SUM(ii.item_in_quantity) - SUM(item_out_quantity) 'Available quantity' 
           FROM items_in ii 
           JOIN items_out io 
             ON io.item_out_nme = ii.item_in_nme 
          GROUP 
             BY ii.item_in_nme
              , io.item_out_nme

糖量显示出一个奇怪的数字。

你能帮我辨别出错了吗