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ezerick on 06/21/11

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# Function to split a list into a table in T-SQL

/ Published in: SQL
`CREATE FUNCTION dbo.DelimitedSplit8K--===== Define I/O parameters        (@pString VARCHAR(8000), @pDelimiter CHAR(1))RETURNS TABLE WITH SCHEMABINDING AS RETURN--===== "Inline" CTE Driven "Tally Table" produces values from 0 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 "zero base" and limits the number of rows right up front                     -- for both a performance gain and prevention of accidental "overruns"                 SELECT 0 UNION ALL                 SELECT TOP (DATALENGTH(ISNULL(@pString,1))) 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 t.N+1                   FROM cteTally t                  WHERE (SUBSTRING(@pString,t.N,1) = @pDelimiter OR t.N = 0)                 )--===== 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 s.N1),        Item       = SUBSTRING(@pString,s.N1,ISNULL(NULLIF(CHARINDEX(@pDelimiter,@pString,s.N1),0)-s.N1,8000))   FROM cteStart s;`