如何在SQL Server中对具有不同列名的两个表进行求和和组联合

Question

以下查询成功返回了信用卡并按供应商检查了日期范围内的付款。 我一直无法使用别名写一个外部选择语句来对金额和供应商分组。 我该如何查询？

SELECT
BillPaymentCreditCard.PayeeEntityRefFullName as Vendor, BillPaymentCreditCard.Amount as Amount 
FROM
BillPaymentCreditCard NOSYNC 
WHERE
BillPaymentCreditCard.TxnDate >= {d'2014-01-01'} and BillPaymentCreditCard.TxnDate <= {d'2014-02-01'} 

UNION ALL

SELECT
BillPaymentCheck.PayeeEntityRefFullName as Vendor, BillPaymentCheck.Amount as Amount 
FROM
BillPaymentCheck NOSYNC 
WHERE 
BillPaymentCheck.TxnDate >= {d'2014-01-01'} and  BillPaymentCheck.TxnDate <= {d'2014-02-01'}

Answer 1

这应该做。 -每个注释-删除nosync表提示。

SELECT Vendor, SUM(Amount) AS TotalAmount
FROM (

    SELECT BillPaymentCreditCard.PayeeEntityRefFullName as Vendor, BillPaymentCreditCard.Amount as Amount
    FROM BillPaymentCreditCard
    WHERE BillPaymentCreditCard.TxnDate >= {d'2014-01-01'}
         and BillPaymentCreditCard.TxnDate <= {d'2014-02-01'}

    UNION ALL

    SELECT BillPaymentCheck.PayeeEntityRefFullName as Vendor, BillPaymentCheck.Amount as Amount
    FROM BillPaymentCheck
    WHERE BillPaymentCheck.TxnDate >= {d'2014-01-01'}
         and BillPaymentCheck.TxnDate <= {d'2014-02-01'}
    ) AS Vendors
GROUP BY Vendor