mysql - 左连接使用 5 个表值 Sum 和 Minus

Question

我正在尝试使用左连接对 5 个表进行求和和减法运算，但在该函数中添加了自动增量

SELECT item.*, 
       SUM(IFNULL(item.item_quantity, 0) 
           + IFNULL(inward.passedquantity, 0) 
           + IFNULL(op.opening_stock, 0) - IFNULL(bom.quantitytopick, 0) + 
           IFNULL(adj.adjustment_quantity, 0)) AS totalquality 
FROM   itemmaster item 
       LEFT JOIN inwardmaster inward 
              ON item.item_barcode = inward.item_barcode 
       LEFT JOIN openingstock op 
              ON item.item_barcode = op.item_barcode 
       LEFT JOIN bomupload bom 
              ON item.item_barcode = bom.item_barcode 
       LEFT JOIN adjustment_inventory adj 
              ON item.item_barcode = adj.item_barcode 
GROUP  BY item.item_barcode