Question

我对此查询过去2天的挑战。我到处搜索但是徒劳无功。我有3张桌子; customers，transactions和withdrawals。客户表有AccountNumber，Names等，交易有FK账号，金额和提款有FK账号和金额。

我只想选择AccountNumber，来自客户的姓名和SUM相应的交易金额和SUM按账户编号提取金额账户编号。

目前我被迫开始

SELECT AccountNumber,FirstName,LastName,Town,Contact
FROM customers
WHERE status = 1
ORDER BY AccountNumber ASC

将数据加载到datatable中并循环遍历它以选择：

SELECT SUM(SusuAmount)
FROM transactions
WHERE AccountNumber = " + account + "
  AND Approval = 1`

和此：

SELECT SUM(ValueAmount)
FROM withdrawals
WHERE AccountNumber = " + account + "
  AND Approval = 1`

请建议一次查询以帮助完成此操作。

Answer 1

尝试此查询：

SELECT cus.AccountNumber,cus.FirstName,cus.LastName,cus.Town,cus.Contract,Sum(trans.SusuAmount) AS TransactionAmount,SUM(widraw.ValueAmount) AS WithdrawalsAmount FROM customers AS cus 
LEFT JOIN transactions AS tran ON (trans.AccountNumber=cus.AccountNumber AND cus.Approval=1)
LEFT JOIN withdrawals AS widraw ON (widraw.AccountNumber=cus.AccountNumber AND widraw.Approval=1) 
WHERE cus.status=1 ORDER BY cus.AccountNumber ASC

从table1 sum table2.column sum table3.column中选择基于表accountNumbers

1 个答案: