UNIONS, JOINS,
Abdusobur Xalimov
UNION vs UNION ALL
time_table_asistant
time_table_tutors_hostory
payment
course_payment
INTERSECT, EXCEPT
time_table_asistant
time_table_tutors_hostory
LEFT JOIN
●
user balance
INNER JOIN
payment qilgan userlarni topish
kurs sotib olganlar sonini toping
course_tutor with task_id
lesson tasks count
unread tasks
unread chats
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