[英]comparing data from tables in sql server
我面臨着巨大的危險。 我有2個表--- PurchaseTbl和CustomerTbl,其中包含:
PurchaseTbl:C_ID(int-FK),Purchase_amt(int)
CustomerTbl:C_ID(int-PK),[其他詳細信息]。
所以我想計算兩個表中的C_ID匹配的所有購買的總和
謝謝
格魯
SELECT C.C_ID,
--You can add more columns (like customer name) here if you wish
SUM(Purchase_amt) AS SUMP
FROM CustomerTbl C
JOIN purchaseTbl P
ON P.C_ID = C.C_ID
GROUP BY C.C_ID
--If you added more columns in the select add them here too separated with comma
如果您只想知道總金額而不將其分成客戶,那么:
SELECT SUM(Purchase_amt) AS SUMP
FROM CustomerTbl C
JOIN purchaseTbl P
ON P.C_ID = C.C_ID
僅當CustomerTbl
有相應的C_ID
,以上內容才會獲得總額。
像這樣在查詢中使用group by子句。
SELECT CustomerTbl.C_ID, SUM(Purchase_amt) AS PurchaseSUM FROM CustomerTbl, purchaseTbl WHERE purchaseTbl.C_ID = CustomerTbl.C_ID GROUP BY CustomerTbl.C_ID
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