You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '24,28,20,26,27,22,23,25,11,1,2, and gdc_cat_producten.publiceren=1 order by p...' at line 1<br />select * from gdc_cat_producten,mod_winkelform_btwcodes where proBtw=btwId and gdc_cat_producten.proFiltersNiv=21,24,28,20,26,27,22,23,25,11,1,2, and gdc_cat_producten.publiceren=1 order by proNieuw desc,gdc_cat_producten.volgnummer,proId