Peak Concurrent Meetings per Org

SQL practice question · Hard · Analytics · Microsoft

A meeting occupies [start_ts, end_ts): a meeting that ends exactly when another starts does NOT overlap with it. For each org find the maximum number of meetings running at the same moment and the earliest time that maximum is reached. Return org_id, max_concurrent and peak_start. Order by org_id.

Table: teams_meetings

Schema of teams_meetings
ColumnType
meeting_idINTEGER
org_idTEXT
start_tsTIMESTAMP
end_tsTIMESTAMP
Sample rows of teams_meetings
meeting_idorg_idstart_tsend_ts
1A2026-08-03 09:00:002026-08-03 10:00:00
2A2026-08-03 09:30:002026-08-03 10:30:00
3A2026-08-03 09:45:002026-08-03 11:00:00
4A2026-08-03 10:00:002026-08-03 10:15:00
5B2026-08-03 13:00:002026-08-03 14:00:00
6B2026-08-03 14:00:002026-08-03 15:00:00
Expected output on the sample data
org_idmax_concurrentpeak_start
A32026-08-03 09:45:00
B12026-08-03 13:00:00

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