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我正在尝试在 MS Access 中使用 SWITCH 函数，但我一直被告知没有正确数量的参数。我是 switch 函数的新手，但我了解语法。

开关（表达式1，值1，表达式2，值2，...表达式_n，值_n）

我是否在交换机中做了一些无法使用的事情，可能是子查询？我检查了我的逗号、括号，并且有一个表达式，然后是一个返回值。当我从 T-SQL 转换为 jet 并替换一个运行良好的 CASE 语句时，我快疯了。

Switch(
        (eh.STARTDTE <> sh.STARTDTE AND IsNull(eh.ENDDTE,"") <> IsNull(sh.ENDDTE,"") AND eh.STARTDTE < sh.STARTDTE),
          "FAIL - Employment Start Date Before Service Start Date",
        (eh.STARTDTE <> sh.STARTDTE AND IsNull(eh.ENDDTE,"") <> IsNull(sh.ENDDTE,"") AND eh.ENDDTE > sh.ENDDTE),
          "FAIL - Employment End Date After Service End Date",
        (eh.STARTDTE <> sh.STARTDTE AND IsNull(eh.ENDDTE,"") <> IsNull(sh.ENDDTE,"") AND  (
                                                                                            SELECT
                                                                                                COUNT(*)
                                                                                            FROM
                                                                                                emphist AS eh2
                                                                                            WHERE
                                                                                                eh2.MEMBNO = sh.MEMBNO
                                                                                            AND eh2.EMPID = sh.EMPID
                                                                                            AND eh2.ENDDTE = DateAdd(dd,-1,eh.STARTDTE)
                                                                                          ) = 0),
          "FAIL - Previous Employment Period Corrupt or Missing",
        (eh.STARTDTE <> sh.STARTDTE AND IsNull(eh.ENDDTE,"") <> IsNull(sh.ENDDTE,"") AND  (
                                                                                            SELECT
                                                                                                COUNT(*)
                                                                                            FROM
                                                                                                emphist AS eh2
                                                                                            WHERE
                                                                                                eh2.MEMBNO = sh.MEMBNo
                                                                                            AND eh2.EMPID = sh.EMPID
                                                                                            AND eh2.ENDDTE = DateAdd(dd,-1,eh.STARTDTE)
                                                                                          ) = 0),
          "FAIL - Previous Employment Period Corrupt or Missing",
        (eh.STARTDTE <> sh.STARTDTE AND IsNull(eh.ENDDTE,"") <> IsNull(sh.ENDDTE,"") AND (
                                                                                            SELECT
                                                                                                COUNT(*)
                                                                                            FROM
                                                                                                emphist AS eh2
                                                                                            WHERE
                                                                                                eh2.MEMBNO = sh.MEMBNO
                                                                                            AND eh2.EMPID = sh.EMPID
                                                                                            AND eh2.STARTDTE = DateAdd(dd,1,eh.ENDDTE)
                                                                                          ) = 0),
          "FAIL - Next Employment Period Corrupt or Missing",
        (eh.STARTDTE = sh.STARTDTE AND eh.ENDDTE <> sh.ENDDTE AND (
                                                                    SELECT
                                                                        COUNT(*)
                                                                    FROM
                                                                        emphist AS eh2
                                                                    WHERE
                                                                        eh2.MEMBNO = sh.MEMBNO
                                                                    AND eh2.EMPID = sh.EMPID
                                                                    AND eh2.STARTDTE = DateAdd(dd,1,eh.ENDDTE)
                                                                  ) = 0),
          "FAIL - Next Employment Period Corrupt or Missing",
        (eh.STARTDTE <> sh.STARTDTE AND eh.ENDDTE = sh.ENDDTE AND (
                                                                    SELECT
                                                                        COUNT(*)
                                                                    FROM
                                                                        emphist AS eh2
                                                                    WHERE
                                                                        eh2.MEMBNO = sh.MEMBNO
                                                                    AND eh2.EMPID = sh.EMPID
                                                                    AND eh2.ENDDTE = DateAdd(dd,-1,eh.STARTDTE)
                                                                  ) = 0),
          "FAIL - Previous Employment Period Corrupt or Missing",
        (eh.STARTDTE = sh.STARTDTE AND eh.ENDDTE = sh.ENDDTE AND  (
                                                                    SELECT
                                                                        COUNT(*)
                                                                    FROM
                                                                        emphist AS eh2
                                                                    WHERE
                                                                        eh2.MEMBNO = sh.MEMBNO
                                                                    AND eh2.EMPID = sh.EMPID
                                                                  ) <> 1),
          "FAIL - Too Many or No Employment History Records"
  ) AS "Reason"

更新了答案

Switch(
        (eh.STARTDTE <> sh.STARTDTE AND NZ(eh.ENDDTE,"") <> NZ(sh.ENDDTE,"") AND eh.STARTDTE < sh.STARTDTE),
          "FAIL - Employment Start Date Before Service Start Date",
        (eh.STARTDTE <> sh.STARTDTE AND NZ(eh.ENDDTE,"") <> NZ(sh.ENDDTE,"") AND eh.ENDDTE > sh.ENDDTE),
          "FAIL - Employment End Date After Service End Date",
        (eh.STARTDTE <> sh.STARTDTE AND NZ(eh.ENDDTE,"") <> NZ(sh.ENDDTE,"") AND  (
                                                                                            SELECT
                                                                                                COUNT(*)
                                                                                            FROM
                                                                                                emphist AS eh2
                                                                                            WHERE
                                                                                                eh2.MEMBNO = sh.MEMBNO
                                                                                            AND eh2.EMPID = sh.EMPID
                                                                                            AND eh2.ENDDTE = DateAdd("dd",-1,eh.STARTDTE)
                                                                                          ) = 0),
          "FAIL - Previous Employment Period Corrupt or Missing",
        (eh.STARTDTE <> sh.STARTDTE AND NZ(eh.ENDDTE,"") <> NZ(sh.ENDDTE,"") AND  (
                                                                                            SELECT
                                                                                                COUNT(*)
                                                                                            FROM
                                                                                                emphist AS eh2
                                                                                            WHERE
                                                                                                eh2.MEMBNO = sh.MEMBNo
                                                                                            AND eh2.EMPID = sh.EMPID
                                                                                            AND eh2.ENDDTE = DateAdd("dd",-1,eh.STARTDTE)
                                                                                          ) = 0),
          "FAIL - Previous Employment Period Corrupt or Missing",
        (eh.STARTDTE <> sh.STARTDTE AND NZ(eh.ENDDTE,"") <> NZ(sh.ENDDTE,"") AND (
                                                                                            SELECT
                                                                                                COUNT(*)
                                                                                            FROM
                                                                                                emphist AS eh2
                                                                                            WHERE
                                                                                                eh2.MEMBNO = sh.MEMBNO
                                                                                            AND eh2.EMPID = sh.EMPID
                                                                                            AND eh2.STARTDTE = DateAdd("dd",1,eh.ENDDTE)
                                                                                          ) = 0),
          "FAIL - Next Employment Period Corrupt or Missing",
        (eh.STARTDTE = sh.STARTDTE AND eh.ENDDTE <> sh.ENDDTE AND (
                                                                    SELECT
                                                                        COUNT(*)
                                                                    FROM
                                                                        emphist AS eh2
                                                                    WHERE
                                                                        eh2.MEMBNO = sh.MEMBNO
                                                                    AND eh2.EMPID = sh.EMPID
                                                                    AND eh2.STARTDTE = DateAdd("dd",1,eh.ENDDTE)
                                                                  ) = 0),
          "FAIL - Next Employment Period Corrupt or Missing",
        (eh.STARTDTE <> sh.STARTDTE AND eh.ENDDTE = sh.ENDDTE AND (
                                                                    SELECT
                                                                        COUNT(*)
                                                                    FROM
                                                                        emphist AS eh2
                                                                    WHERE
                                                                        eh2.MEMBNO = sh.MEMBNO
                                                                    AND eh2.EMPID = sh.EMPID
                                                                    AND eh2.ENDDTE = DateAdd("dd",-1,eh.STARTDTE)
                                                                  ) = 0),
          "FAIL - Previous Employment Period Corrupt or Missing",
        (eh.STARTDTE = sh.STARTDTE AND eh.ENDDTE = sh.ENDDTE AND  (
                                                                    SELECT
                                                                        COUNT(*)
                                                                    FROM
                                                                        emphist AS eh2
                                                                    WHERE
                                                                        eh2.MEMBNO = sh.MEMBNO
                                                                    AND eh2.EMPID = sh.EMPID
                                                                  ) <> 1),
          "FAIL - Too Many or No Employment History Records"
  ) AS "Reason"
4

2 回答 2

0

好的，有两个问题。

  1. IsNull 函数不是 Access 函数，因此我替换为 NZ（语法相同）。

  2. 对于 DateAdd 函数，我忽略了用语音标记包围 datepart 参数。

查询现在可以愉快地运行。我猜是因为 IsNull 函数没有被识别，它看起来好像缺少我认为的参数。经验教训，不正确的参数数量也可能表明无效的功能。

注意。我将使用修改后的 switch 语句更新我的 OP，以供其他人比较。

于 2017-11-01T10:37:15.193 回答
0

引发错误的不是Switch而是IsNull 。所以替换所有这些错误的语句：

IsNull(eh.ENDDTE,"")

和：

Nz(eh.ENDDTE)
于 2017-11-01T10:14:44.257 回答