Need help with a query

[Michael Morris]

Here it is

[sql]SELECT * FROM post
WHERE userid = 1
AND postid IN SELECT reviewids from product where productid = 3 [/sql]

The product table has a field called reviewids which is a list of reviewsids in this format 980,1020,2212

I know I can execute a single query to grab the ids and a second query to make this check (which should return true or false), but I'd rather do it in one query if I can.