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Krzysztof kuhy Rudnicki
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Docker mysql:8.0.33 container, judge-style output grading, 12 original drills with live-verified references kept in tests only. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WzxdWZewj4WS5X6AZyjWDp
408 B
408 B
LAG and DATEDIFF: find long gaps between logins
logins has one row per user per day they logged in. Find every pair of
consecutive logins by the same user that are 7 or more days apart.
Output columns (no header): user_name, previous login date, login date,
gap in days.
- Order by
user_name, then login date ascending. - Window functions cannot appear in
WHERE; wrap them in a CTE or subquery.