[英]Assistance with Access ADP and/or SQL iif statement
我使用 Access ADP 作为 SQL 的前端。 我有两张桌子:
我想根据 Purchase_Date 从 Price_2018 或 Price_2020 表中选择价格。 我首先尝试将 IiF 语句放在查询设计器中:
Iif ([Purchase_Date] < Convert(DateTime, '2020-01-01 00:00:00'),[Price_2018],[Price_2020])
Access 不允许这样做,最终将整个内容放在 SQL 窗格中的引号中,所以我得到的只是文本 output。
有人建议放入 Select 部分:
CASE ([Purchase_Date] < CONVERT(DATETIME, '2020-01-01 00:00:00') WHEN 1 THEN [Price_2018] ELSE [Price_2020]
那也不起作用,并给了我这个错误:
Error in list of function arguments: '<' not recognized.Error in list of function arguments: ',' not recognized.Error in list of function arguments: 'FROM' not recognized.
Unable to parse query text.
CASE
语句。我按照建议合并了 2 个价格表(称为 VWC_2018_2020 的合并表)。 完整查询:
SELECT TOP 100 PERCENT dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Service_ID, dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Service_Date_From, dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Update_Status, dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Account_Number, dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Service_Units, dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Modifiers, dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Procedure_Code, NormalUnionCPASumAdjustments.SumAmount AS Adjustment, NormalUnionCPASumPayments.SumAmount AS Payment, dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Service_Fee AS Charge, dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Service_Fee - ISNULL(NormalUnionCPASumPayments.SumAmount, 0) AS Unpaid, dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Primary_Diagnosis_Code, LastInsurancePmt.last_insurance_pmt, dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Patient_Number, dbo.VWCFees_2018_2020.VWC_2020, dbo.VWCFees_2018_2020.VWC_2018, IIF (dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Service_Date_From < CDate('2020-01-01 00:00:00'),dbo.VWCFees_2018_2020.VWC_2018,dbo.VWCFees_2018_2020.VWC_2020) AS VWCFEE
FROM dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo LEFT OUTER JOIN dbo.VWCFees_2018_2020 ON dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Procedure_Code = dbo.VWCFees_2018_2020.CPT LEFT OUTER JOIN dbo.NormalUnionCPASumAdjustments() NormalUnionCPASumAdjustments ON dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Service_ID = NormalUnionCPASumAdjustments.Service_ID LEFT OUTER JOIN dbo.NormalUnionCPASumPayments() NormalUnionCPASumPayments ON dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Service_ID = NormalUnionCPASumPayments.Service_ID LEFT OUTER JOIN dbo.LastInsurancePmt() LastInsurancePmt ON dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Service_ID = LastInsurancePmt.Service_ID
WHERE (dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Update_Status <= 1) AND (dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Service_Date_From BETWEEN @StartDate AND @EndDate) AND (dbo.VHCSERVER_Ntier_VHC_dbo_vwGenSvcInfo.Patient_Number = @VHC_NumberChild)
在 Access 中运行,给出错误消息:“<”无法识别。 缺少 FROM 子句。 无法解析查询文本。
现在怎么办? 谢谢
由于ADP 文件使用 SQL 服务器后端(自 MS Access 2013 起不再支持),您必须使用其 TSQL 方言,它支持IIF
(或CASE
)并且可以将日期与字符串表示形式进行比较而无需转换。
下面我将扩展到更全面的查询,假设有各种列。 根据需要调整:
SELECT
...
IIF(t.[Purchase_Date] < '2020-01-01', p18.price, p20.price)
...
FROM [Transactions] t
INNER JOIN [Price_2018] p18
ON t.price_id = p18.price_id
INNER JOIN [Price_2020] p20
ON t.price_id = p20.price_id
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