Longest Daily Login Streak

SQL practice question · Hard · Gaps & Islands · Atlassian, Meta

Users can log in to the Jira app many times per day. A streak is a run of consecutive calendar days with at least one login. For every user return user_id, longest_streak_days, streak_start and streak_end (dates 'YYYY-MM-DD') of their longest streak; if two streaks tie, report the earliest one. Order by longest_streak_days DESC, then user_id.

Table: logins

Schema of logins
ColumnType
user_idINTEGER
login_tsTIMESTAMP
Sample rows of logins
user_idlogin_ts
1012026-03-01 08:00:00
1012026-03-01 21:00:00
1012026-03-02 09:00:00
1012026-03-03 09:30:00
1012026-03-05 10:00:00
1022026-03-02 11:00:00
1022026-03-03 11:00:00
1022026-03-07 11:00:00
Expected output on the sample data
user_idlongest_streak_daysstreak_startstreak_end
10242026-03-072026-03-10
10132026-03-012026-03-03
10312026-03-042026-03-04

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