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목록between (2)
RE:cord
[SQL] Analyzing User Retention (유저 리텐션 분석) (DATEDIFF / BETWEEN AND / HAVING)
* 문제 애매한 점 정의 - reservation date가 따로 없음. ⇒ activity_date를 reservation date로 취급 - 가입일에만 접속 로그가 남아있는 사용자 처리 조건 명시 x -> 가입일에만 접속한 사람도 활동유저로 집계 SELECT ua.user_id, ua.activity_date, COUNT(ua.activity_date)FROM user_profiles AS up JOIN user_activities AS ua ON up.user_id = ua.user_idWHERE DATEDIFF(activity_date, signup_date) BETWEEN 0 AND 30GROUP BY up.user_id--HAVING COUNT(up.user_id)>0-- * ..
[SQL] UNION / COUNT / BETWEEN
SELECT games FROM olympics_athletes_events WHERE age = (SELECT max(age) FROM olympics_athletes_events) UNION SELECT games FROM olympics_athletes_events WHERE age = (SELECT min(age) FROM olympics_athletes_events); select count(order_id) from shopify_orders; SELECT worker_id, login_timestamp FROM worker_loginsWHERE login_timestamp BETWEEN '2021-12-13 00:00:00' AND '2021-12-19 23:59:59'; Just i..