访问IIF查询

Question

我需要将“最终决策”字段作为 IIF 语句的结果。

但我不断收到语法错误。

    SELECT x.AR_ID, 
           Final Decision: IIf([x].[R_DECISION] Is Not Null,
                               [R_DECISION],
                               IIf([ap_decsion] Is Not Null,
                                   [ap_decsion],
                                   IIf([ho_decision] Is Not Null,
                                       [ho_decision],[ar_decision])
                                   )
                              ) FROM x;

Answer 1

您需要将列别名放在 IIF 语句的末尾，并在其周围放置 []

  SELECT x.AR_ID, 
         IIf([x].[R_DECISION] Is Not Null,
            [R_DECISION],
            IIf([ap_decsion] Is Not Null,
               [ap_decsion],
                  IIf([ho_decision] Is Not Null,
                     [ho_decision],
                     [ar_decision]))) as [Final Decision:]

  FROM x;

Answer 2

尝试使用 ISNULL 代替：

SELECT x.AR_ID，最终决策：IIf(NOT ISNULL([x].[R_DECISION]),[R_DECISION],IIf(NOT ISNULL([ap_decsion]),[ap_decsion],IIf( NOT ISNULL([ho_decision]),[ho_decision],[ar_decision])))
来自 x;