解答
210
SQL文(クエリ)
WITH first AS ( SELECT cid , MIN(date_time) AS min_date_time , MIN(session_count) AS min_session_count FROM sample.web_log GROUP BY cid HAVING min_session_count = 1 ) , cvs AS ( SELECT cid , MIN(date_time) AS min_cv_date_time FROM ( SELECT cid , date_time FROM sample.web_log WHERE page = "/thank_you/" ) GROUP BY cid ) SELECT cid , FORMAT_DATETIME("%F", min_date_time) AS first_visit_day , FORMAT_DATETIME("%F", min_cv_date_time) AS first_cv_day , DATETIME_DIFF(min_cv_date_time, min_date_time, DAY) AS cv_leadtime_days FROM first JOIN cvs USING (cid) ORDER BY min_cv_date_time DESC LIMIT 1