testsAndMisc/python_pkg/sql_drills/tests/solutions/11_lag_gap.sql
Krzysztof kuhy Rudnicki ee78ae44cc
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Add sql_drills MySQL exact-match harness
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
2026-11-01 21:13:18 +01:00

11 lines
296 B
SQL

WITH gaps AS (
SELECT user_name,
LAG(login_on) OVER (PARTITION BY user_name ORDER BY login_on) AS prev_on,
login_on
FROM logins
)
SELECT user_name, prev_on, login_on, DATEDIFF(login_on, prev_on)
FROM gaps
WHERE DATEDIFF(login_on, prev_on) >= 7
ORDER BY user_name, login_on;