SQL - 在月份有 WHERE 时获取所有月份的应付总和

Question

已编辑：感谢大家的回复，但似乎一切都脱离了上下文。我的错，我应该详细说明。

查询是针对Master-Child reportviewer（后端的SQL Server 2008 R2）；其中 delvoucher 与 dvdetails 表具有 1:m 关系。该报告实际上是一张发票，在顶部（列表）显示cient_title和deliverydate等，并在内部tablix（主子报告场景）中显示交付细节。在底部，我显示所选月份的所有应付金额的总和。 （月份是通过放置在相同表单中的日期时间选择器选择的，该表单还包含我的 reportviewer 控件并刷新所选值更改的报告）。但是，我想得到自客户开始以来的总应付额减去本月的金额，即应付余额）。我应该使用 UNION 吗？并运行单独的查询以获取 SUM(amount) 而无需应用 WHERE month is blah blah。

总体问题是我必须显示拖欠 (sum(payable) - sum(paid)) 支付的金额是从另一个表中获得的 : 编辑关闭

我的查询

SELECT        
    delvoucher.dvdate, 
    delvoucher.dvno, 
    delvoucher.vehicleno, 
    delvoucher.salesman, 
    dvdetails.[desc], 
    dvdetails.supply, 
    dvdetails.empty, 
    dvdetails.amount, 
    dvdetails.rate, 
    delvoucher.title, 
    customer.currentaddress, 
    customer.phone, 
    customer.code
FROM         
    delvoucher 
    INNER JOIN dvdetails ON delvoucher.id = dvdetails.pid 
    INNER JOIN customer ON delvoucher.title = customer.title
WHERE        
    YEAR(delvoucher.dvdate) = YEAR(@i) 
    AND MONTH(delvoucher.dvdate) = MONTH(@i)

我想要的只是检索 SUM(dvdetails.amount)，例如

SELECT        
    SUM(dvdetails.amount) , 
    delvoucher.dvdate, 
    delvoucher.dvno, ............

这可能很简单，但它给了我错误。我哪里错了

Answer 1

您可以使用GROUP BY 语句和SUM() 来制作这样的每月摘要：

SELECT 
    SUM(dvdetails.amount), 
    YEAR(delvoucher.dvdate), 
    MONTH(delvoucher.dvdate) 
FROM
    delvoucher 
    INNER JOIN dvdetails ON delvoucher.id = dvdetails.pid 
    INNER JOIN customer ON delvoucher.title = customer.title
WHERE
    YEAR(delvoucher.dvdate) = YEAR(@i) 
    AND MONTH(delvoucher.dvdate) = MONTH(@i)
GROUP BY 
    YEAR(delvoucher.dvdate), 
    MONTH(delvoucher.dvdate)

您可以在此处阅读相关问题： SQL query to retrieve SUM in various DATE ranges

GOUP BY 的文档在这里： http://www.w3schools.com/sql/sql_groupby.asp

希望这会有所帮助。

Answer 2

@naota 有正确的答案，但如果您正在寻找这样的选择，即返回所有的 delvoucher 行：

SELECT        
    SUM(dvdetails.amount) , 
    delvoucher.dvdate, 
    delvoucher.dvno, ............

而不是

SELECT 
    AmountSum = SUM(dvdetails.amount),
    Year = YEAR(delvoucher.dvdate),
    Month = MONTH(delvoucher.dvdate)

那么您的查询可能看起来像这样（未经测试）

SELECT        
    totals.AmountSum,
    delvoucher.dvdate, 
    delvoucher.dvno, 
    delvoucher.vehicleno, 
    delvoucher.salesman, 
    dvdetails.[desc], 
    dvdetails.supply, 
    dvdetails.empty, 
    dvdetails.amount, 
    dvdetails.rate, 
    delvoucher.title, 
    customer.currentaddress, 
    customer.phone, 
    customer.code
FROM         
    delvoucher 
    INNER JOIN dvdetails ON delvoucher.id = dvdetails.pid 
    INNER JOIN customer ON delvoucher.title = customer.title
    INNER JOIN (   
        SELECT 
            AmountSum = SUM(dvdetails.amount),
            Year = YEAR(delvoucher.dvdate),
            Month = MONTH(delvoucher.dvdate) 
        FROM
            delvoucher 
            INNER JOIN dvdetails ON delvoucher.id = dvdetails.pid 
            INNER JOIN customer ON delvoucher.title = customer.title
        WHERE
            YEAR(delvoucher.dvdate) = YEAR(@i) 
            AND MONTH(delvoucher.dvdate) = MONTH(@i)
        GROUP BY 
            YEAR(delvoucher.dvdate), 
            MONTH(delvoucher.dvdate)
    ) totals ON totals.Year = YEAR(delvoucher.dvdate) AND totals.Month = MONTH(delvoucher.dvdate)
WHERE        
    YEAR(delvoucher.dvdate) = YEAR(@i) 
    AND MONTH(delvoucher.dvdate) = MONTH(@i)

基本上你的查询内部加入@naota 的查询加入年份和月份