UPDATE burger_cfs SET real_cf_diff = IF( fonbet IS NULL , -1, 1 / real_cf -1 / fonbet ) WHERE bk_name =  'fonbet' AND  `status` =1;
UPDATE burger_cfs SET real_cf_diff = IF( marathon IS NULL , -1, 1 / real_cf -1 / olimp ) WHERE bk_name =  'marathon' AND  `status` =1;
UPDATE burger_cfs SET real_cf_diff = IF( olimp IS NULL , -1, 1 / real_cf -1 / olimp ) WHERE bk_name =  'olimp' AND  `status` =1