SQL查詢與GROUP BY子句，與和aggreagte

有問題，這個sql查詢

IM，查詢是自我解釋，所以看着它會告訴ü什麼問題，有SQL查詢與GROUP BY子句，與和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

來源

2013-05-31 Mirza Asghir Baig

我看着它，我看到的問題是，你沒有給我一個線索是什麼問題 – DaveRlz

哪裏是sum（）聚合？應該有一些像（sum（somecloumn） – nakosspy

那麼你怎麼想計算等欄目，你只customerid分組使用聚合函數爲組中未使用的列，但要顯示也paymentdata.paidamount,paymentdata.balanceamount和paymentreceipt.paidamount？

考慮到該組爲每個組返回多行，所以sql-server（或除MySql外的任何其他rdbms）不知道要爲未分組的列顯示哪一行。如果您不想挑選出單行，則必須彙總該列。所以例如通過使用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

來源

2013-05-31 07:47:53

我想使用這個「sum（paymentreceipt.paidamount）AS Expr1」只有 –

@MirzaAsghirBaig：編輯我的答案使用SUM（paymentreceipt.paidamount）AS ReceiptPaidSum'。但是你是什麼想與其他兩個非分組列？ –

我想有這樣的事情 –

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

來源

2013-05-31 07:45:48

你有IM在你的小組中缺少一些術語。需要包括除彙總之外的所有列。

來源

2013-05-31 07:46:22 davek

您需要通過條款

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

來源

2013-05-31 07:46:54

如果你正在做的聚集，那麼你可能想聚合函數：

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

這可能仍然不會爲您提供正確的號碼，因爲您正在交付付款和收據。如果你想得到更好的答案，那麼你應該在問題中提供樣本數據和預期結果。

來源

2013-05-31 07:48:01

SQL查詢與GROUP BY子句，與和aggreagte

回答

相關問題