SQL Server查询返回重复的行

我有SQL的查询是多个表的连接，它返回重复的行和经历无法找出小时后在那里它去错了SQL Server查询返回重复的行

SELECT 
    StkItem.iUOMStockingUnitID, 
    _etblUnits1.cUnitCode as 'parkSize', 
    _etblUnits2.cUnitCode as 'quantitySize', 
    InvNum.fInvTotExclForeign, 
    [_btblInvoiceLines].*, 
    [_rtblCountry].cCountryName, 
    [CurrencyHist].fBuyRate, 
    Vendor.Name, 
    InvNum.OrderDate, 
    InvNum.InvNumber 
FROM 
    [dbo].[_btblInvoiceLines] 
LEFT JOIN 
    StkItem ON StkItem.StockLink = [_btblInvoiceLines].iStockCodeID 
LEFT JOIN 
    _etblUnits as _etblUnits1 ON _etblUnits1.idunits = StkItem.iUOMDefSellUnitID 
LEFT JOIN 
    _etblUnits as _etblUnits2 ON _etblUnits2.idunits = StkItem.iUOMStockingUnitID 
LEFT JOIN 
    InvNum ON iInvoiceID = AutoIndex 
LEFT JOIN 
    Vendor ON Vendor.DCLink = InvNum.AccountID 
LEFT JOIN 
    [_rtblCountry] ON [_rtblCountry].idCountry = Vendor.iCountryID 
LEFT JOIN 
    [CurrencyHist] ON InvNum.ForeignCurrencyID = [CurrencyHist].iCurrencyID 
WHERE 
    OrderNum = '' 
    AND [CurrencyHist].iCurrencyID = (SELECT TOP 1 iCurrencyID 
             FROM [CurrencyHist] 
             WHERE iCurrencyID = InvNum.ForeignCurrencyID 
             ORDER BY idCurrencyHist DESC)

这里是查询，任何帮助将高度赞赏，在此先感谢

来源

2017-02-10 lulliezy

'ORDER BY'在嵌套查询工作？ –

逐个删除连接，直到额外的行消失。然后你知道问题在哪里。 –

当我加入currencyhist表 – lulliezy

从您以前的意见，当您加入[CurrencyHist]时，问题即将到来。从名字来看，它似乎是历史表，因此每个货币必须有多行作为历史记录。要消除重复的行，您应该加入特定货币的最新更新记录。所以，你的查询也能像下面，

SELECT StkItem.iUOMStockingUnitID, 
      _etblUnits1.cUnitCode as 'parkSize', 
      _etblUnits2.cUnitCode as 'quantitySize', 
      InvNum.fInvTotExclForeign, 
      [_btblInvoiceLines].*, 
      [_rtblCountry].cCountryName, 
      [CurrencyHist].fBuyRate, 
      Vendor.Name, 
      InvNum.OrderDate, 
      InvNum.InvNumber 
    FROM [dbo].[_btblInvoiceLines] 
    LEFT JOIN StkItem ON StkItem.StockLink = [_btblInvoiceLines].iStockCodeID 
    LEFT JOIN _etblUnits as _etblUnits1 ON _etblUnits1.idunits = StkItem.iUOMDefSellUnitID 
    LEFT JOIN _etblUnits as _etblUnits2 ON _etblUnits2.idunits = StkItem.iUOMStockingUnitID 
    LEFT JOIN InvNum ON iInvoiceID = AutoIndex 
    LEFT JOIN Vendor ON Vendor.DCLink = InvNum.AccountID 
    LEFT JOIN [_rtblCountry] ON [_rtblCountry].idCountry = Vendor.iCountryID 
    LEFT JOIN (SELECT DENSE_RANK() over (partition by [CurrencyHist].iCurrencyID order by [CurrencyHist].LastUpdated desc) as rn,[CurrencyHist].iCurrencyID as 'iCurrencyID' 
    FROM [CurrencyHist] AS [CurrencyHist] 
    )[CurrencyHist] ON InvNum.ForeignCurrencyID = [CurrencyHist].iCurrencyID 
    and [CurrencyHist].rn=1 
WHERE OrderNum = '' AND 
[CurrencyHist].iCurrencyID = (SELECT TOP 1 iCurrencyID 
             FROM [CurrencyHist] 
             WHERE iCurrencyID = InvNum.ForeignCurrencyID 
             ORDER BY idCurrencyHist DESC)

注：我假设CurrencyHist表中有日期时间数据类型列一个LastUpdated

来源

2017-02-10 09:06:52

我刚刚更新了你的建议和工作后，我刚看到这个答案，谢谢 – lulliezy

SQL Server查询返回重复的行

回答

相关问题