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with t1 as
(
select date'2016-7-1' d1 from dual
union
select date'2016-7-2' d1 from dual
union
select date'2016-7-4' d1 from dual
union
select date'2016-7-5' d1 from dual
union
select date'2016-7-6' d1 from dual
union
select date'2016-7-7' d1 from dual
union
select date'2016-7-8' d1 from dual
union
select date'2016-7-9' d1 from dual
union
select date'2016-7-11' d1 from dual
union
select date'2016-7-12' d1 from dual
union
select date'2016-7-13' d1 from dual
union
select date'2016-7-14' d1 from dual
union
select date'2016-7-18' d1 from dual
union
select date'2016-7-19' d1 from dual
)
select gn,min(d1),max(d1),count(*)
from(
select d1,to_number(to_char(d1,'dd'))-row_number() over(order by d1) gn from t1
)group by gn order by 2
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