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Parse a delimited string, return n-th value

By Ray Wong,

This UDF will parse a string delimited by the character you specify and return the value in the n-th position you requested.

select dbo.fn_parse('this string', ' ', 1) --> 'this'
select dbo.fn_parse('this string', ' ', 2) --> 'string'
select dbo.fn_parse('this string', ' ', 3) --> NULL
select dbo.fn_parse('this  string', ' ', 2) --> ''

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