Tsql 在SQL Server 2008中，从字符串中获取下划线之前的字符，并用逗号分隔

我试过这个问题

 DECLARE @AdvancedSearchSelectedDropdownName TABLE (
    SelectedIds VARCHAR(2048),
    AdvanceSearchOptionTypeId INT
)

INSERT INTO @AdvancedSearchSelectedDropdownName
VALUES ('4_0,5_1,6_2,7_3', 23),
       ('62_3', 21), ('2_4', 23)

DECLARE @selectedIds VARCHAR(MAX) = '';

SELECT @selectedIds +=
    CASE WHEN SelectedIds IS NULL
            THEN  @selectedIds  +  ISNULL(SelectedIds + ',', '')
         WHEN SelectedIds IS NOT NULL
            THEN  SUBSTRING(SelectedIds, 0, CHARINDEX('_', SelectedIds, 0)) + ','
    END
   FROM @AdvancedSearchSelectedDropdownName WHERE advanceSearchOptionTypeId = 23

SELECT @selectedIds

电流输出：4,2

所需输出：4,5,6,7,2

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在SelectedDS列中，可能有n个逗号分隔的值。

您可以这样做：

WITH Casted AS
(
    SELECT * 
          ,CAST('<x><y>' + REPLACE(REPLACE(SelectedIds,'_','</y><y>'),',','</y></x><x><y>') + '</y></x>' AS XML)  SplittedToXml
    FROM @AdvancedSearchSelectedDropdownName
)
SELECT *
FROM Casted;

提示：不要存储逗号分隔的值！ 以这种格式存储数据是一个非常糟糕的主意。您可以使用诸如my XML之类的通用格式来存储此文件或相关副表的结构。但这样的构造往往会成为一个真正的麻烦…

免责声明。根据第一个标准形式，您不应该在单个单元格中存储多个值。我建议您避免以这种方式存储。 方法仍然是：创建一个UDF函数，将逗号分隔的列表分隔为表值变量。下面的代码我还没有测试过。但是，它给出了如何处理这个问题的想法

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如果对助手函数感兴趣

厌倦了提取字符串左，右，charindex，patindex。。。我修改了s split/parse函数以接受两个不相似的分隔符。在这种情况下，a和

范例

返回

TVF如果感兴趣

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再想想。也许更简单一点

现在，如果你有有限的

范例

返回

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阅读，你会看到很多原因，为什么这个问题的答案绝对是肯定的！繁重的工作是标记器。。。顺便说一句，这个选择@selectedIds+=。。。称为古怪更新，不建议连接字符串。可能会有意想不到的结果。。。更好地使用XML路径，从v2016开始，有一个字符串\u AGG…在其中挖掘嵌套的XMLpass@JohnCappelletti是的，很酷。我曾经在分解多行csv时发现了这个。在一次传递中使用换行符和分号，并将整个文件作为xml获取。

<x>
  <y>4</y>
  <y>0</y>
</x>
<x>
  <y>5</y>
  <y>1</y>
</x>
<x>
  <y>6</y>
  <y>2</y>
</x>
<x>
  <y>7</y>
  <y>3</y>
</x>

WITH Casted AS
(
    SELECT * 
          ,CAST('<x><y>' + REPLACE(REPLACE(SelectedIds,'_','</y><y>'),',','</y></x><x><y>') + '</y></x>' AS XML)  SplittedToXml
    FROM @AdvancedSearchSelectedDropdownName
)
SELECT Casted.AdvanceSearchOptionTypeId AS TypeId
      ,x.value('y[1]/text()[1]','int') AS IdValue
FROM Casted
CROSS APPLY SplittedToXml.nodes('/x') A(x);

TypeId  IdValue
23      4
23      5
23      6
23      7
21      62
23      2

Declare @selectedIds varchar(max) = '';
SET @selectedIds = SELECT STUFF
   (SELECT ','+ (SUBSTRING(c.value, 0, CHARINDEX('_', c.value, 0)) 
   FROM @AdvancedSearchSelectedDropdownName AS tv 
   CROSS APPLY dbo.udfForCSVToList(SelectedIds) AS c
   WHERE advanceSearchOptionTypeId = 23
   FOR XML PATH('')),1,2,'');
SELECT @selectedIds

;with cte as (
    Select A.AdvanceSearchOptionTypeId
          ,B.*
          ,RN = Row_Number() over(Order by (Select NULL))
     From  @AdvancedSearchSelectedDropdownName A
     Cross Apply [dbo].[tvf-Str-Extract](','+A.SelectedIds,',','_') B
)
Select AdvanceSearchOptionTypeId
      ,IDs = stuff((Select ',' +RetVal From cte Where AdvanceSearchOptionTypeId=A.AdvanceSearchOptionTypeId Order by RN,RetVal For XML Path ('')),1,1,'')
 From cte A
 Group By AdvanceSearchOptionTypeId

AdvanceSearchOptionTypeId   IDs
21                          62
23                          4,5,6,7,2

CREATE FUNCTION [dbo].[tvf-Str-Extract] (@String varchar(max),@Delimiter1 varchar(100),@Delimiter2 varchar(100))
Returns Table 
As
Return (  

with   cte1(N)   As (Select 1 From (Values(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) N(N)),
       cte2(N)   As (Select Top (IsNull(DataLength(@String),0)) Row_Number() over (Order By (Select NULL)) From (Select N=1 From cte1 N1,cte1 N2,cte1 N3,cte1 N4,cte1 N5,cte1 N6) A ),
       cte3(N)   As (Select 1 Union All Select t.N+DataLength(@Delimiter1) From cte2 t Where Substring(@String,t.N,DataLength(@Delimiter1)) = @Delimiter1),
       cte4(N,L) As (Select S.N,IsNull(NullIf(CharIndex(@Delimiter1,@String,s.N),0)-S.N,8000) From cte3 S)

Select RetSeq = Row_Number() over (Order By N)
      ,RetPos = N
      ,RetVal = left(RetVal,charindex(@Delimiter2,RetVal)-1) 
 From  (
        Select *,RetVal = Substring(@String, N, L) 
         From  cte4
       ) A
 Where charindex(@Delimiter2,RetVal)>1

)
/*
Max Length of String 1MM characters

Declare @String varchar(max) = 'Dear [[FirstName]] [[LastName]], ...'
Select * From [dbo].[tvf-Str-Extract] (@String,'[[',']]')
*/

;with cte as (
Select *
      ,RN = Row_Number() over(Order by (Select NULL))
    From  @AdvancedSearchSelectedDropdownName A
)
Select AdvanceSearchOptionTypeId
      ,IDs = replace(
             replace(
             replace(
             replace(
             replace(
             stuff((Select ',' +SelectedIds From cte Where AdvanceSearchOptionTypeId=A.AdvanceSearchOptionTypeId Order by RN For XML Path ('')),1,1,'')
             ,'_0','')
             ,'_1','')
             ,'_2','')
             ,'_3','')
             ,'_4','')
 From  cte A
 Group By AdvanceSearchOptionTypeId

AdvanceSearchOptionTypeId   IDs
21                          62
23                          4,5,6,7,2