Error: SELECT * FROM `alt_productsgroupval` as pgv left join alt_categorygroups as cg on cg.productid=pgv.productid left join alt_productsgroup as pg on pg.ID=pgv.productsgroupid where cg.categoryid = 687 group by pg.TopID

Disk full (/var/tmp/#sql_1b5c_0); waiting for someone to free some space...