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with ttest(id, beginTime, endTime) as ( select 10, to_date('13/01/2019 11', 'dd/mm/yyyy hh24'), to_date('13/01/2019 15', 'dd/mm/yyyy hh24') from dual union all select 20, to_date('13/01/2019 20', 'dd/mm/yyyy hh24'), to_date('14/01/2019 09', 'dd/mm/yyyy hh24') from dual union all select 30, to_date('13/01/2019 18', 'dd/mm/yyyy hh24'), to_date('15/01/2019 10', 'dd/mm/yyyy hh24') from dual union all select 40, to_date('16/01/2019 22', 'dd/mm/yyyy hh24'), null from dual) select dt, 24 * sum(nvl2(endtime, least(dt + 1, endtime, dt + 1), dt) - nvl2(endtime, greatest(begintime, dt), begintime)) duration from ttest t join (select trunc(nvl(endtime, sysdate)) dt from ttest) d on begintime < dt + 1 and (dt < endtime or endtime is null) group by dt order by dt
DT
DURATION
13-JAN-19
14
14-JAN-19
33
15-JAN-19
10
30-JAN-19
314