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Comma Separated String to Rows in Table in SQL SERVER

Code :

DECLARE @id_list VARCHAR(MAX) = '21100010004,21100010008,21100010011'
DECLARE @table TABLE ( id VARCHAR(50) )
DECLARE @x INT = 0
DECLARE @firstcomma INT = 0
DECLARE @nextcomma INT = 0

SET @x = LEN(@id_list) - LEN(REPLACE(@id_list, ',', '')) + 1 -- number of ids in id_list

WHILE @x > 0
    BEGIN
        SET @nextcomma = CASE WHEN CHARINDEX(',', @id_list, @firstcomma + 1) = 0
                              THEN LEN(@id_list) + 1
                              ELSE CHARINDEX(',', @id_list, @firstcomma + 1)
                         END
        INSERT  INTO @table
        VALUES  ( SUBSTRING(@id_list, @firstcomma + 1, (@nextcomma - @firstcomma) - 1) )
        SET @firstcomma = CHARINDEX(',', @id_list, @firstcomma + 1)
        SET @x = @x - 1
    END

SELECT  RTRIM(LTRIM(id))
FROM    @table

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