使用 SUBSTRING() SQL Server 2008-R2 从字符串中获取数字

Question

我有一些如下所示的数据：

AS WRITTEN                                             | UNITS | ROUTINE
TRANSFUSE - RED BLOOD CELLS 1 UNITS ROUTINE, TRANSF... | 1     | 
TRANSFUSE - RED BLOOD CELLS 2UNITS ROUTINE, TRAN...    | 2     |
TRANSFUSE FRESH FROZEN PLASMA 2 ROUTINE                |       | 2
TRANSFUSE - RED BLOOD CELLS 2 UNITS ROUTINE, TRAN...   | 2     |
TRANSFUSE CRYOPRECIPITATE 10 ROUTINE                   |       |    <- 10 SHOULD BE HERE

我正在使用以下SELECT 语句来获取值，这可能是一种粗略的做法，但这是我第一次涉足SUBSTRING() CHARINDEX ETC。

SELECT 语句：

, CASE
    WHEN SUBSTRING(SO.DESC_AS_WRITTEN, CHARINDEX('UNIT', SO.DESC_AS_WRITTEN)-2,1) NOT IN (
        '1','2','3','4','5','6','7','8','9','10','11'
    )
        THEN ''
    ELSE SUBSTRING(SO.DESC_AS_WRITTEN, CHARINDEX('UNIT', SO.DESC_AS_WRITTEN)-2,1)
  END AS [UNITS]
, CASE 
    WHEN SUBSTRING(SO.DESC_AS_WRITTEN, CHARINDEX('ROUTINE', SO.DESC_AS_WRITTEN)-2,1) NOT IN (
        '1','2','3','4','5','6','7','8','9','10','11'
    )
        THEN ''
    ELSE SUBSTRING(SO.DESC_AS_WRITTEN, CHARINDEX('ROUTINE', SO.DESC_AS_WRITTEN)-2,2)
  END AS [ROUTINE]

如上所述，10 应该显示在ROUTINE 下的最后一列中，但不是，我不明白为什么。所有其他人似乎都工作得很好。

谢谢，

更新 在@EkriirkE 和@GoatCO 的大力帮助下，我使用了以下代码作为解决方案：

,(CAST
    (ISNULL
        (REPLACE
            (REPLACE
                (REPLACE
                    (CASE 
                        WHEN PATINDEX('%[0-9]UNIT%',so.desc_as_written) > 0 
                            THEN SUBSTRING(so.desc_as_written,
                                 PATINDEX('%[0-9]UNIT%',so.desc_as_written)-1,2) 
                        WHEN PATINDEX('%[0-9] UNIT%',so.desc_as_written) > 0 
                            THEN SUBSTRING(so.desc_as_written,
                                 PATINDEX('%[0-9] UNIT%',so.desc_as_written)-1,2)
                        WHEN PATINDEX('%[0-9]ROUTINE%',so.desc_as_written) > 0 
                            THEN SUBSTRING(so.desc_as_written,
                                 PATINDEX('%[0-9]ROUTINE%',so.desc_as_written)-1,2)
                        WHEN PATINDEX('%[0-9] ROUTINE%',so.desc_as_written) > 0 
                            THEN SUBSTRING(so.desc_as_written,
                                 PATINDEX('%[0-9] ROUTINE%',so.desc_as_written)-1,2)
                        WHEN PATINDEX('%[0-9]STAT%',so.desc_as_written) > 0 
                            THEN SUBSTRING(so.desc_as_written,
                                 PATINDEX('%[0-9]STAT%',so.desc_as_written)-1,2)
                        WHEN PATINDEX('%[0-9] STAT%',so.desc_as_written) > 0 
                            THEN SUBSTRING(so.desc_as_written,
                                 PATINDEX('%[0-9] STAT%',so.desc_as_written)-1,2)
                        WHEN PATINDEX('%[0-9]TODAY%',so.desc_as_written) > 0 
                            THEN SUBSTRING(so.desc_as_written,
                                 PATINDEX('%[0-9]TODAY%',so.desc_as_written)-1,2)
                        WHEN PATINDEX('%[0-9] TODAY%',so.desc_as_written) > 0 
                            THEN SUBSTRING(so.desc_as_written,
                                 PATINDEX('%[0-9] TODAY%',so.desc_as_written)-1,2) 
                    END,
                'S',''),
            'T',''),
        'U','')
    , 0)
AS INT)
) AS [TEST]

Answer 1

从查找 UNIT 或 ROUTINE 备份 2 个字符后，您只需要 1 个字符。 “10 ROUTINE”返回不在您的 IN 列表中的“0”。即您的代码仅适用于个位数。您应该取 -3 个字符然后 2 个字符长度并修剪空格，但如果您的样本中确实有“2UNITS”与“2 UNITS”之类的运行，那么您会遇到更多困难

Answer 2

这可能更可取：

SELECT *,CASE WHEN PATINDEX('%[0-9]UNITS%',written) > 0 THEN SUBSTRING(written,PATINDEX('%[0-9]UNITS%',written)-1,2) 
              WHEN PATINDEX('%[0-9] UNITS%',written) > 0 THEN SUBSTRING(written,PATINDEX('%[0-9] UNITS%',written)-1,2) 
         END
        ,CASE WHEN PATINDEX('%[0-9]ROUTINE%',written) > 0 THEN SUBSTRING(written,PATINDEX('%[0-9]ROUTINE%',written)-1,2)
              WHEN PATINDEX('%[0-9] ROUTINE%',written) > 0 THEN SUBSTRING(written,PATINDEX('%[0-9] ROUTINE%',written)-1,2)
         END 
FROM  #Table1

演示：SQL Fiddle

将CASE 语句包装在替换中可能比处理给定变体获取适当数量的字符更简单，即：

SELECT *,REPLACE(CASE WHEN PATINDEX('%[0-9]UNITS%',written) > 0 THEN SUBSTRING(written,PATINDEX('%[0-9]UNITS%',written)-1,2) 
                      WHEN PATINDEX('%[0-9] UNITS%',written) > 0 THEN SUBSTRING(written,PATINDEX('%[0-9] UNITS%',written)-1,2) 
                 END,'S','')                       
        ,REPLACE(CASE WHEN PATINDEX('%[0-9]ROUTINE%',written) > 0 THEN SUBSTRING(written,PATINDEX('%[0-9]ROUTINE%',written)-1,2)
                      WHEN PATINDEX('%[0-9] ROUTINE%',written) > 0 THEN SUBSTRING(written,PATINDEX('%[0-9] ROUTINE%',written)-1,2)
                 END,'S','') 
FROM  #Table1