Im trying to create a new table on SQL which will have summarized data.
For example. In the original table i have this data:
If you see rows 9, 10 and 11 they are consecutive, so i want to group them on one row with
Begin: 2020-07-02 20:11:00.000 End: 2020-07-02 20:13:00.000
Ignore rows 12 and 13. I made a mistake colorizing them
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Answer
This is a gaps-and-islands problem. You want to group consecutive rows whose gap between begin_date
is less than 1 minute.
Here, I would recommend you lag()
and a cumulative sum to define the groups, then aggregation:
select id, min(begin_date) begin_date, max(begin_date) end_date from ( select t.*, sum(case when begin_date <= dateadd(minute, 1, lag_begin_date) then 0 else 1 end) over(partition by id order by begin_date) grp from ( select t.*, lag(begin_date) over(partition by id order by begin_date) lag_begin_date from mytable t ) t ) t group by id, grp