SQL에서 열 값 구문 분석

Question

제한이없는 테이블 STG(ID,VALUE,TEXT)이 있습니다.

ID|VALUE|TEXT 
1 |22 |sample 
4 |19 |question 
4 |17 |question 
5 |29 |solution 
. 
. 
. 

가 어떻게 SQL 서버에서이 작업을 수행 할 수 있습니다 -

여기

ID|VALUE|TEXT 
1 |22 |sample 
4 |19,17|question 
5 |29 |solution 
. 
. 
. 

내가 원하는 것입니다 - 여기

내가 가진 무엇인가?

Answer 1

당신은 (결국 아주 멀리) 여기에 게시 예를 DelimitedSplit8K 기능에 사용할 수

:

http://www.sqlservercentral.com/articles/Tally+Table/72993/

그리고이 같은 당신의 선택과 그 가입 :

select 
    t.ID, 
    s.Item, 
    t.TEXT 
from 
    table t 
    cross apply dbo.DelimitedSplit8K(t.VALUE, ',') s 

편집 기능 코드 포함 :

CREATE FUNCTION [dbo].[DelimitedSplit8K] 
--===== Define I/O parameters 
     (@pString VARCHAR(8000), @pDelimiter CHAR(1)) 
--WARNING!!! DO NOT USE MAX DATA-TYPES HERE! IT WILL KILL PERFORMANCE! 
RETURNS TABLE WITH SCHEMABINDING AS 
RETURN 
--===== "Inline" CTE Driven "Tally Table" produces values from 1 up to 10,000... 
    -- enough to cover VARCHAR(8000) 
    WITH E1(N) AS (
       SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
       SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
       SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 
       ),       --10E+1 or 10 rows 
     E2(N) AS (SELECT 1 FROM E1 a, E1 b), --10E+2 or 100 rows 
     E4(N) AS (SELECT 1 FROM E2 a, E2 b), --10E+4 or 10,000 rows max 
cteTally(N) AS (--==== This provides the "base" CTE and limits the number of rows right up front 
        -- for both a performance gain and prevention of accidental "overruns" 
       SELECT TOP (ISNULL(DATALENGTH(@pString),0)) ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E4 
       ), 
cteStart(N1) AS (--==== This returns N+1 (starting position of each "element" just once for each delimiter) 
       SELECT 1 UNION ALL 
       SELECT t.N+1 FROM cteTally t 
       WHERE SUBSTRING(@pString,t.N,1) = @pDelimiter 
       ), 
cteLen(N1,L1) AS(--==== Return start and length (for use in substring) 
       SELECT s.N1, 
        ISNULL(NULLIF(CHARINDEX(@pDelimiter,@pString,s.N1),0)-s.N1,8000) 
        FROM cteStart s 
       ) 
--===== Do the actual split. The ISNULL/NULLIF combo handles the length for the final element when no delimiter is found. 
SELECT ItemNumber = ROW_NUMBER() OVER(ORDER BY l.N1), 
     Item  = SUBSTRING(@pString, l.N1, l.L1) 
    FROM cteLen l 
;