SQL查询与GROUP BY子句，与和aggreagte

有问题，这个sql查询

IM，查询是自我解释，所以看着它会告诉ü什么问题，有SQL查询与GROUP BY子句，与和aggreagte

SELECT customer.customerid, 
     paymentdata.paidamount, 
     paymentdata.balanceamount, 
     sum(paymentreceipt.paidamount) AS Expr1 
FROM customer 
     INNER JOIN paymentdata 
       ON customer.customerid = paymentdata.customerid 
     INNER JOIN paymentreceipt 
       ON customer.customerid = paymentreceipt.customerid 
GROUP BY customer.customerid

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2013-05-31 Mirza Asghir Baig

我看着它，我看到的问题是，你没有给我一个线索是什么问题 – DaveRlz

哪里是sum（）聚合？应该有一些像（sum（somecloumn） – nakosspy

那么你怎么想计算等栏目，你只customerid分组使用聚合函数为组中未使用的列，但要显示也paymentdata.paidamount,paymentdata.balanceamount和paymentreceipt.paidamount？

考虑到该组为每个组返回多行，所以sql-server（或除MySql外的任何其他rdbms）不知道要为未分组的列显示哪一行。如果您不想挑选出单行，则必须汇总该列。所以例如通过使用SUM，COUNT，MAX或AVG：

例如：

SELECT customer.customerid, 
     MAX(paymentdata.paidamount) AS MaxPaid, 
     AVG(paymentdata.balanceamount) AS AverageBalance, 
     SUM(paymentreceipt.paidamount) AS ReceiptPaidSum 
FROM customer 
     INNER JOIN paymentdata 
       ON customer.customerid = paymentdata.customerid 
     INNER JOIN paymentreceipt 
       ON customer.customerid = paymentreceipt.customerid 
GROUP BY customer.customerid

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2013-05-31 07:47:53

我想使用这个“sum（paymentreceipt.paidamount）AS Expr1”只有 –

@MirzaAsghirBaig：编辑我的答案使用SUM（paymentreceipt.paidamount）AS ReceiptPaidSum'。但是你是什么想与其他两个非分组列？ –

我想有这样的事情 –

SELECT customer.customerid,paymentdata.customerid,paymentreceipt.customerid 
     paymentdata.paidamount, 
     paymentdata.balanceamount, 
     paymentreceipt.paidamount AS Expr1 
FROM customer,paymentdata,paymentreceipt 
     INNER JOIN paymentdata 
       ON customer.customerid = paymentdata.customerid 
     INNER JOIN paymentreceipt 
       ON customer.customerid = paymentreceipt.customerid 
GROUP BY customer.customerid,paymentdata.customerid,paymentreceipt.customerid

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2013-05-31 07:45:48

你有IM在你的小组中缺少一些术语。需要包括除汇总之外的所有列。

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2013-05-31 07:46:22 davek

您需要通过条款

SELECT customer.customerid, 
     sum(paymentdata.paidamount), 
     sum(paymentdata.balanceamount), 
     sum(paymentreceipt.paidamount) AS Expr1 
FROM customer 
     INNER JOIN paymentdata 
       ON customer.customerid = paymentdata.customerid 
     INNER JOIN paymentreceipt 
       ON customer.customerid = paymentreceipt.customerid 
GROUP BY customer.customerid

来源

2013-05-31 07:46:54

如果你正在做的聚集，那么你可能想聚合函数：

SELECT customer.customerid, 
     sum(paymentdata.paidamount), 
     sum(paymentdata.balanceamount), 
     sum(paymentreceipt.paidamount) AS Expr1 
FROM customer 
     INNER JOIN paymentdata 
       ON customer.customerid = paymentdata.customerid 
     INNER JOIN paymentreceipt 
       ON customer.customerid = paymentreceipt.customerid 
GROUP BY customer.customerid

这可能仍然不会为您提供正确的号码，因为您正在交付付款和收据。如果你想得到更好的答案，那么你应该在问题中提供样本数据和预期结果。

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2013-05-31 07:48:01

SQL查询与GROUP BY子句，与和aggreagte

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