Split function equivalent in T-SQL?

Try this

DECLARE @xml xml, @str varchar(100), @delimiter varchar(10)
SET @str="1,2,3,4,5,6,7,8,9,10,11,12,13,14,15"
SET @delimiter=","
SET @xml = cast(('<X>'+replace(@str, @delimiter, '</X><X>')+'</X>') as xml)
SELECT C.value('.', 'varchar(10)') as value FROM @xml.nodes('X') as X(C)

OR

DECLARE @str varchar(100), @delimiter varchar(10)
SET @str="1,2,3,4,5,6,7,8,9,10,11,12,13,14,15"
SET @delimiter=","
;WITH cte AS
(
    SELECT 0 a, 1 b
    UNION ALL
    SELECT b, CHARINDEX(@delimiter, @str, b) + LEN(@delimiter)
    FROM CTE
    WHERE b > a
)
SELECT SUBSTRING(@str, a,
CASE WHEN b > LEN(@delimiter) 
    THEN b - a - LEN(@delimiter) 
    ELSE LEN(@str) - a + 1 END) value      
FROM cte WHERE a > 0

Many more ways of doing the same is here How to split comma delimited string?

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