Question

我使用以下IIF语句继承了Access查询，我试图将其转换为SQL Where条件。我用这个玩了几天不能得到它返回相同的结果。任何帮助将不胜感激。

访问

WHERE (((IIf([EFFDATE]-[MATDATE]<>[PDU_DAYS]-1 And [Calc_Type]="Cycles",IIf([PDU_DAYS] Between [30DayDQMin]+1 And [89DayDQMax]+1,"Yes","No"),IIf([PDU_DAYS] Between 31 And 90,"Yes","No")))="Yes"));

对于SQL代码，我一直在使用各种布尔语句，如下所示。我也试过构建一些案例逻辑。到目前为止没有运气。

([EffDATE]-[MatDate] <> [PDU_Days]-1 and CalcType = 'Cycles' and PDU_Days Between [30DayDQMin]+1 and [89DayDQMax]+1 or PDU_Days Between 31 and 90)

Answer 1

你应该成功使用几个CASE WHEN x THEN a ELSE b END指令如下：

WHERE
CASE WHEN (([EFFDATE]-[MATDATE]<>[PDU_DAYS]-1) And ([Calc_Type]='Cycles')) THEN
    CASE WHEN (([PDU_DAYS] Between [30DayDQMin]+1) And ([89DayDQMax]+1))
        THEN 'Yes' ELSE 'No' END
ELSE 
     CASE WHEN ([PDU_DAYS] Between 31 And 90) THEN 'Yes' ELSE 'No' END
END 

= 'Yes'

注意T-SQL单引号样式！

Answer 2

这是等效的SQL-Server语法：

(
    CASE WHEN ([EFFDATE]-[MATDATE] <> [PDU_DAYS]-1 AND [Calc_Type]= 'Cycles') THEN
        CASE WHEN ([PDU_DAYS] BETWEEN [30DayDQMin]+1 AND [89DayDQMax]+1) THEN 'Yes' ELSE 'No' END
    ELSE
        CASE WHEN [PDU_DAYS] BETWEEN 31 AND 90 THEN 'Yes' ELSE 'No' END
    END
) = 'yes'

如果[MATDATE]和[EFFDATE]是datetime字段，那么：

(
    CASE WHEN (DATEDIFF(dd,[MATDATE],[EFFDATE]) <> [PDU_DAYS]-1 AND [Calc_Type]= 'Cycles') THEN
        CASE WHEN ([PDU_DAYS] BETWEEN [30DayDQMin]+1 AND [89DayDQMax]+1) THEN 'Yes' ELSE 'No' END
    ELSE
        CASE WHEN [PDU_DAYS] BETWEEN 31 AND 90 THEN 'Yes' ELSE 'No' END
    END
) = 'Yes'

Answer 3

你真的不应该需要所有有条件的复杂性，这应该产生相同的结果：

WHERE ([EFFDATE]-[MATDATE]<>[PDU_DAYS]-1 
       AND [Calc_Type]="Cycles" 
       AND ([PDU_DAYS] BETWEEN [30DayDQMin]+1 AND [89DayDQMax]+1)
      )
      OR ([PDU_DAYS] Between 31 And 90)

Access IIF表达式转换为SQL

3 个答案: