[英]comparing data from tables in sql server
我面临着巨大的危险。 我有2个表--- PurchaseTbl和CustomerTbl,其中包含:
PurchaseTbl:C_ID(int-FK),Purchase_amt(int)
CustomerTbl:C_ID(int-PK),[其他详细信息]。
所以我想计算两个表中的C_ID匹配的所有购买的总和
谢谢
格鲁
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
如果您只想知道总金额而不将其分成客户,那么:
SELECT SUM(Purchase_amt) AS SUMP
FROM CustomerTbl C
JOIN purchaseTbl P
ON P.C_ID = C.C_ID
仅当CustomerTbl
有相应的C_ID
,以上内容才会获得总额。
像这样在查询中使用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
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.