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INSERT 0 16
clientmac apmac start_time dwell_time
1 a 2019-11-01 12:01:00+00 00:09:00
1 b 2019-11-01 12:10:00+00 00:15:00
1 a 2019-11-01 12:25:00+00 02:10:00
2 a 2019-11-01 12:20:00+00 00:02:00
SELECT 4