SQL Join table-valued function with table where table field is a function input

Question

I have a table-valued function called fn_SplitCommaSep, which comma-separates a text field (from \'a, b, c\' to 3 rows: a b c)

How can I join this to a table, taking

Answer 1

Storing comma-separated values in a DB aside, take a look at APPLY

So something like:

SELECT fs.TextWithoutComma, mt.Id 
FROM   MyTable mt 
    CROSS APPLY fn_SplitCommaSep(mt.TextWithCommas) AS fs