访问 SQL 到 T-SQL

Question

此查询在 MS Access 中有效：

SELECT 
       Firm.Adm_Firm_ID, 
       Firm.CCIS_Firm_Seqn_Nbr, 
       Firm.Firm_Name, 
       Firm.Dba_Firm_Name, 
       OHA.File_Closure_Date, 
       OHA.Adm_Qual_Flag,
       OHA.Firm_FY_End_Date,
       OHA.Report_Received_Date,
       OHA.Cognizant_Letter_Flag, 
       OHA.Audit_Type, 
       Firm.AQ_Flag,
       IIF(OHA.File_Closure_Date>=DATEADD("m", -18, Date()),"Yes","No") AS Relevant
FROM 
      dbo_Adm_Firm AS Firm 
INNER JOIN 
      dbo_Adm_OHA_Rate AS OHA ON Firm.Adm_Firm_ID = OHA.Adm_Firm_ID
WHERE 
      ((OHA.File_Closure_Date IS NOT Null) AND (OHA.File_Closure_Date>#1/1/2010#))
ORDER BY 
      Firm.Firm_Name, OHA.Firm_FY_End_Date DESC;

我尽力将其转换为 T-SQL，我在批处理脚本中调用它。

SELECT 
      Firm.Adm_Firm_ID, 
      Firm.CCIS_Firm_Seqn_Nbr, 
      Firm.Firm_Name, 
      Firm.Dba_Firm_Name, 
      OHA.File_Closure_Date, 
      OHA.Adm_Qual_Flag, 
      OHA.Firm_FY_End_Date, 
      OHA.Report_Received_Date, 
      OHA.Cognizant_Letter_Flag, 
      OHA.Audit_Type, 
      Firm.AQ_Flag, 
      IIF(OHA.File_Closure_Date>=DATEADD(m, -18, GETDATE()),'Yes','No') AS Relevant
FROM 
      dbo.Adm_Firm AS Firm 
INNER JOIN 
      dbo.Adm_OHA_Rate AS OHA ON Firm.Adm_Firm_ID = OHA.Adm_Firm_ID
WHERE 
      ((OHA.File_Closure_Date IS NOT Null) AND (OHA.File_Closure_Date>'1/1/2010'))
ORDER BY 
      Firm.Firm_Name, OHA.Firm_FY_End_Date DESC;

我在 excel 文件中得到的输出是：

消息 102，级别 15，状态 1，服务器 CH-IS-DB1，第 3 行
'>' 附近的语法不正确。

所以我相信问题出在DATEADD 方法上，但我就是不知道有什么区别。我尝试将 Date() 更改为 GetDate() 并更改字符串分隔符。有什么建议吗？

Answer 1

尝试使用CASE WHEN

SELECT 
      Firm.Adm_Firm_ID, 
      Firm.CCIS_Firm_Seqn_Nbr, 
      Firm.Firm_Name, 
      Firm.Dba_Firm_Name, 
      OHA.File_Closure_Date, 
      OHA.Adm_Qual_Flag, 
      OHA.Firm_FY_End_Date, 
      OHA.Report_Received_Date, 
      OHA.Cognizant_Letter_Flag, 
      OHA.Audit_Type, 
      Firm.AQ_Flag, 
      CASE 
      WHEN OHA.File_Closure_Date >= DATEADD(m, -18, GETDATE()) THEN 'Yes'ELSE 'No' END AS Relevant
FROM 
      dbo.Adm_Firm AS Firm 
INNER JOIN 
      dbo.Adm_OHA_Rate AS OHA ON Firm.Adm_Firm_ID = OHA.Adm_Firm_ID
WHERE 
      ((OHA.File_Closure_Date IS NOT Null) AND (OHA.File_Closure_Date>'1/1/2010'))
ORDER BY 
      Firm.Firm_Name, OHA.Firm_FY_End_Date DESC;