목록MySQL 달력 (2)

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[SQL] rolling retention 계산

0. 목표 - rolling retention 계산 1. 실습 1) 데이터 만들기 - 링크 2) 쿼리 작성 (1) 각 id 별 첫 번째 접속일과 마지막 접속일 연산 WITH summary AS ( SELECT id, MIN(dated) AS first_login, MAX(dated) AS last_login FROM sql_test.classic_retention GROUP BY 1 ORDER BY 1 ), (2) 달력 생성 Calendar AS ( SELECT CONCAT(y, '0101') + INTERVAL tt*1000 + a*100 + b*10 + c DAY AS dt FROM (SELECT 0 AS tt UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SE..
ComputerLanguage_Program/SQL 2022. 2. 1. 02:26
[SQL] MySQL 로 달력(일 / 요일 테이블) 만들기

0. 목표 - MySQL 로 달력 만들기 1. 실습 -- 2000-01-01 부터 + 9999 일까지 달력 만들기 WITH Calendar AS ( SELECT CONCAT(y, '0101') + INTERVAL tt*1000 + a*100 + b*10 + c DAY AS dt FROM (SELECT 0 AS tt UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9 ) AS tt , (SELECT 0 AS a UNION ALL SELECT 1 UNION ..
ComputerLanguage_Program/SQL 2021. 12. 8. 00:12
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