5-Mustaqil ish
UNION, INTERSECT, MINUS, HAVING va DISTINCT standart so‘zidan foydalanish. JOIN lar bilan ishlash. Agregat funksiyalardan foydalanish. ORDER BY kommandasidan foydalanib satrlarni tartiblashtirish. ORDER BY kommandasidan foydalanib satrlarni tartiblashtirish
