Question

I’m curious if it’s possible to select, as one field a JOIN of several integral ids… something along the lines of

table foo
1 | a
2 | b
3 | c

and then pseudo code:

select CONCAT_AS_STRING( (select id from foo), ",");  //the "," would be the token that it would JOIN on

so the result would be
“1,2,3”

Does MySQL have such a feature?

Answer 1

Try GROUP_CONCAT:

SELECT GROUP_CONCAT(id SEPARATOR ‘,’) FROM foo;