Question

我有一个字段（SIDENT），其中包含不同格式的文本数据。我想更新数据并制作一致的格式。目前的数据如下：

22-Jan-2014-0101
22-Jan-2014-0101
23-Jan-14-10001
QA Calibration C
23-Jan-14-10005

我想要的是YYYY-MM-DD-##### ---我必须忽略Alpha字符串（“QA ...”）

我有一个报告的选择语句（缺少运算符） - 有人可以告诉我错误在哪里吗？

SELECT SIDENT,
   CASE WHEN SUBSTRING(SIDENT, 10, 1) = '-' THEN CAST(CAST(SUBSTRING(SIDENT, 1, 9) AS DATE) AS NVARCHAR) + '-' +
          (CASE WHEN LEN(SIDENT) = 15 THEN SUBSTRING(SIDENT, 11, 5) ELSE '0' + SUBSTRING(SIDENT, 11, 4) END)   ELSE
          CAST(CAST(SUBSTRING(SIDENT, 1, 11) AS DATE) AS NVARCHAR) + '-' +
          (CASE WHEN LEN(SIDENT) = 15 THEN SUBSTRING(SIDENT, 13, 5) ELSE '0' + SUBSTRING(SIDENT, 13, 4) END)
   END AS SIDENT_FIXED
FROM ExcelFile_sident
ORDER BY 
   CASE WHEN SUBSTRING(SIDENT, 10, 1) = '-' THEN CAST(CAST(SUBSTRING(SIDENT, 1, 9) AS DATE) AS NVARCHAR) + '-' +
          (CASE WHEN LEN(SIDENT) = 15 THEN SUBSTRING(SIDENT, 11, 5) ELSE '0' + SUBSTRING(SIDENT, 11, 4) END)   ELSE
          CAST(CAST(SUBSTRING(SIDENT, 1, 11) AS DATE) AS NVARCHAR) + '-' +
          (CASE WHEN LEN(SIDENT) = 15 THEN SUBSTRING(SIDENT, 13, 5) ELSE '0' + SUBSTRING(SIDENT, 13, 4) END)
   END

Answer 1

正如评论中所指出的，Access不使用Case...when...end语法。相反，您需要使用inline ifs（[IIF]）1。如果我尝试在Access查询中使用Case，那么您所说的错误就是我得到的确切错误。

其他Access转化次数为

Cast(xxx as Date) ---＆gt; CDate()

Cast(xxx as NVARCHAR) ---＆gt; CStr()

Substring() ---＆gt; Mid()

+ ---＆gt; ＆安培;

SELECT SIDENT, iif(Mid(SIDENT, 10, 1) = '-', mid(SIDENT, 1, 9) & '-' & 
   iif(LEN(SIDENT) = 15,Mid(SIDENT, 11, 5),'0' & Mid(SIDENT, 11, 4))
      , Mid(SIDENT, 1, 11) & '-' & iif(LEN(SIDENT) = 15,Mid(SIDENT, 13, 5)
      ,'0' + Mid(SIDENT, 13, 4)) ) as SIDENT_FIXED 
from  ExcelFile_sident 
order by iif(Mid(SIDENT, 10, 1) = '-', mid(SIDENT, 1, 9) & '-' & 
   iif(LEN(SIDENT) = 15,Mid(SIDENT, 11, 5),'0' & Mid(SIDENT, 11, 4))
      , Mid(SIDENT, 1, 11) & '-' & iif(LEN(SIDENT) = 15,Mid(SIDENT, 13, 5)
      ,'0' + Mid(SIDENT, 13, 4)) )

Answer 2

如果要使用Access SQL转换这些字符串，请使用此立即窗口示例中的Access支持的函数：

SIDENT = "22-Jan-2014-0101"
? InstrRev(SIDENT,"-")
 12 
? Left(SIDENT, InstrRev(SIDENT,"-") - 1)
22-Jan-2014
? Format(Left(SIDENT, InstrRev(SIDENT,"-") - 1), "yyyy-mm-dd")
2014-01-22
? Format(Left(SIDENT, InstrRev(SIDENT,"-") - 1), "yyyy-mm-dd") _
    & "-" & Format(Mid(SIDENT, InstrRev(SIDENT,"-") + 1), "00000")
2014-01-22-00101

以下是使用这些功能的SELECT查询：

SELECT
    e.ID,
    e.SIDENT,
    Format(Left(SIDENT, InstrRev(SIDENT, '-') - 1), 'yyyy-mm-dd') 
        & '-' & Format(Mid(SIDENT, InstrRev(SIDENT, '-') + 1), '00000')
        AS SIDENT_FIXED
FROM ExcelFile_sident AS e
WHERE e.SIDENT ALike '%-%';

请注意WHERE子句：我假设您要转换的SIDENT值都包含至少一个＆＃34; - ＆＃34;字符。如果我的假设是错误的，请根据需要更改WHERE子句。

以下是基于您的示例数据的查询输出：

ID SIDENT           SIDENT_FIXED
-- ---------------- ----------------
 1 22-Jan-2014-0101 2014-01-22-00101
 2 22-Jan-2014-0101 2014-01-22-00101
 3 23-Jan-14-10001  2014-01-23-10001
 5 23-Jan-14-10005  2014-01-23-10005

如果您确实要更改存储的SIDENT值，请将SELECT转换为UPDATE查询。

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2 个答案: