Extract values from a string using a delimiter

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Extract values from a string using a delimiter

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Tim Sneller

Posted Sunday, September 23, 2007 2:26 AM

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Comments posted to this topic are about the item Extract values from a string using a delimiter

Post #401518

RyanRandall

Posted Thursday, November 01, 2007 6:07 AM

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Just for fun :D, here's the same sort of thing using the recursive CTE technique...

DECLARE @String VARCHAR(255)
DECLARE @Delimiter CHAR(1)
DECLARE @Occurrence INT
DECLARE @Num_Fields INT

SET @String = 'A,B,C,D,E'
SET @Delimiter = ','
SET @Occurrence = 2
SET @Num_Fields = 2

DECLARE @s VARCHAR(255)
SET @String = @String + @Delimiter

; WITH
a AS (
SELECT CAST(NULL AS VARCHAR(255)) AS x, @String y, 0 AS i
UNION ALL
SELECT LEFT(y, CHARINDEX(',', y)-1), SUBSTRING(y, CHARINDEX(',', y)+1, 255), i + 1 FROM a WHERE y <> '')
SELECT @s = ISNULL(@s + ',', '') + x
FROM a, (SELECT CASE WHEN @Occurrence < 0 THEN COUNT(*) + @Occurrence ELSE @Occurrence END AS o FROM a) b
WHERE i BETWEEN o AND o + @Num_Fields - 1

PRINT @s -->B,C

Ryan Randall

Solutions are easy. Understanding the problem, now, that's the hard part.

Post #417478

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