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Status1 Status2 Dt1 Dt2
A D 2019-05-23 10:00:00 2019-05-23 13:00:00
A D 2019-05-23 14:00:00 2019-05-23 17:00:00
A null 2019-05-23 18:00:00 null
Warning: Null value is eliminated by an aggregate or other SET operation.