SELECT * FROM point_users pu
where point > 20000
SELECT * from users u
where name = '황**'
SELECT * from orders o
where course_title = '웹개발 종합반' and payment_method = 'CARD'
SELECT * FROM users u
WHERE name = '황' or name = '이'
SELECT * from orders o
WHERE payment_method !='CARD'
SELECT * from point_users pu
WHERE point BETWEEN 20000 and 23962
SELECT *from users u
where email like 's%com'
SELECT *from users u
where email like 's%com' and name ='이**'
SELECT * from orders o
where payment_method = 'kakaopay'
limit 100
select DISTINCT (payment_method) from orders o
select count(*) from orders
where payment_method ='kakaopay'
select count(DISTINCT(name)) from users u
