SELECT DISTINCT 
crs.serial_spt, 
crs.serial_lvl,
lvl.name_lvl, 
crs.serial_set,
setc.name_set, 
crs.serial_scy  
FROM course crs 
JOIN level lvl ON lvl.serial_lvl = crs.serial_lvl
JOIN section setc ON setc.serial_set = crs.serial_set
WHERE crs.serial_scy = '3' 
AND crs.status_crs = 'ACTIVE'