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SELECT t1.id FROM (SELECT a.*,1 as ascase FROM `artikli` a INNER JOIN artikli2category a2c ON a.`id` = a2c.`id_artikla` WHERE a.`id`!='0' AND a.`novo`!='on' AND a.`aktivan`='on' AND a.`naziv`!='' AND a.`vpcena`!='0.00' AND a2c.`category_id` IN (15) UNION SELECT a.*,1 as ascase FROM `artikli` a INNER JOIN artikli2category a2c ON a.`id` = a2c.`id_artikla` WHERE a.`id`!='0' AND a.`novo`!='on' AND a.`aktivan`='on' AND a.`naziv`!='' AND a.`vpcena`!='0.00' AND a2c.`category_id` IN (15) ) t1 ORDER BY ascase ASC, t1.`sifra` ASC LIMIT 0, 24