select only where 2 things are true

A your_id brand_id B brand_id description A is filled with this data 1-1, 1-2, 2-2, 3-1, 3-2 how to get the your_id's with description of the brand where there are more brand_id's to a your_id with the next query i can get the data out with a where clause, but I want to select only the combo's select A.your_id as id, B.description from A left join B on A.brand_id=B.brand_id what do i have to add, or do I have to use a subquery (fi so, i use mysql, so I have to make temporary table) so the output I want would be only 1 ( as it has two brand_id's, and 3 ( also 2 brand_id's)) thanks in advance