MYSQL/leetcode3 Confirmation Rate 특정 조건을 만족하는 행의 개수 세기 테이블 구조Table: Signups (가입 테이블) +----------------+----------+| Column Name | Type |+----------------+----------+| user_id | int || time_stamp | datetime |+----------------+----------+user_id는 이 테이블의 고유값 컬럼입니다.각 행은 user_id를 가진 사용자의 가입 시간 정보를 포함합니다.Table: Confirmations (확인 테이블)+----------------+----------+| Column Name | Type |+----------------+----------+| user_id .. 2025. 7. 28. Students and Examinations 문제+---------------+---------+| Column Name | Type |+---------------+---------+| student_id | int || student_name | varchar |+---------------+---------+student_id is the primary key (column with unique values) for this table.Each row of this table contains the ID and the name of one student in the school. Table: Subjects+--------------+---------+| Column Name | Type |+-----------.. 2025. 7. 28. Students and Examinations 문제+---------------+---------+| Column Name | Type |+---------------+---------+| student_id | int || student_name | varchar |+---------------+---------+student_id is the primary key (column with unique values) for this table.Each row of this table contains the ID and the name of one student in the school. Table: Subjects+--------------+---------+| Column Name | Type |+-----------.. 2025. 7. 23. 이전 1 다음