[英]SQL using SUM and INNER JOIN issue
当我尝试执行以下所示的查询时出现此错误
在选择列表中,列“ dbo.Stock_Purchase.Supplier_ID”无效,因为它既不包含在聚合函数中,也不包含在GROUP BY子句中。
查询:
SELECT
dbo.Stock_Purchase.*, dbo.Stock_Purchase_Details.*,
dbo.Supplier.*,
SUM(Stock_Purchase_Details.Discount) AS totaldis
FROM
dbo.Stock_Purchase
INNER JOIN
dbo.Stock_Purchase_Details ON dbo.Stock_Purchase.Purchase_ID = dbo.Stock_Purchase_Details.Purchase_ID
INNER JOIN
dbo.Supplier ON dbo.Stock_Purchase.Supplier_ID = dbo.Supplier.Supplier_ID
GROUP BY
Stock_Purchase.Purchase_ID
您只能在GROUP BY
中将该列包括为SELECT
的“裸露”列。 所以:
SELECT p.Purchase_ID, sum(pd.Discount) as totaldis
FROM dbo.Stock_Purchase p INNER JOIN
dbo.Stock_Purchase_Details pd
ON p.Purchase_ID = pd.Purchase_ID INNER JOIN
dbo.Supplier s
ON p.Supplier_ID = s.Supplier_ID
GROUP BY p.Purchase_ID ;
还要注意表别名如何使查询更易于阅读,编写和理解。
如果确实需要所有详细信息,则可以使用窗口功能:
SELECT p.*, pd.*, s.*,
SUM(pd.Discount) OVER (PARTITION BY p.Purchase_ID) as totaldis
FROM dbo.Stock_Purchase p INNER JOIN
dbo.Stock_Purchase_Details pd
ON p.Purchase_ID = pd.Purchase_ID INNER JOIN
dbo.Supplier s
ON p.Supplier_ID = s.Supplier_ID;
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