Convert comma-separated list of values into a single comma-separated string?

Question

How to convert this:

('xxx','yyy','zzz')

Into this:

('xxx,yyy,zzz')

Using T-SQL?

Answer 1

DECLARE @x VARCHAR(32) = '''xxx'',''yyy'',''zzz''';
SELECT REPLACE(@x, ''',''', ',');

If all you want to do is concatenate then you can do:

SELECT @param1 + ',' + @param2 + ',' ... + @param30;

However that is just silly IMHO. This is like washing each of your socks separately.

I have to question what you're going to do with the value now... if these are separate entities why are they comma-separated in the first place? Perhaps you should look into table-valued parameters instead of this comma-separated values nonsense, then you can use the values in a set-based way right from the start.

Answer 2

by concatenating the values ( which means individual columns )?

SELECT (col1 + ',' + col2+ ',' + col3) 
FROM   tableName