[프로그래머스, 131535] 조건에 맞는 회원수 구하기 (mysql)

 

https://school.programmers.co.kr/learn/courses/30/lessons/131535

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SELECT COUNT(user_id) AS USERS
FROM user_info
WHERE joined BETWEEN "2021-01-01" AND "2021-12-31"
AND age >= 20 and age <= 29