How can I write a query for this?

Question

I have a table as below ,
room.........date.............inventory
A..............01/01.................5
A..............01/02.................5
A..............01/03.................5
A..............01/05.................5
A..............01/06.................5
A..............01/07.................8
I want the output as below
room.....begin_date........end_date......inventory
A............01/01.................01/03..........5
A............01/05.................01/06..........5
A............01/07.................01/07..........8
Is there any suggestion?
Thanks
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Answer 1

with x as
(select 'A' room, to_date ('01/01/2007', 'mm/dd/yyyy') d, 5 i from dual union all
select 'A' room, to_date ('01/02/2007', 'mm/dd/yyyy') d, 5 i from dual union all
select 'A' room, to_date ('01/03/2007', 'mm/dd/yyyy') d, 7 i from dual union all
select 'A' room, to_date ('01/04/2007', 'mm/dd/yyyy') d, 7 i from dual union all
select 'A' room, to_date ('01/05/2007', 'mm/dd/yyyy') d, 5 i from dual union all
select 'A' room, to_date ('01/06/2007', 'mm/dd/yyyy') d, 5 i from dual
select min (d)
     , max (d)
     , min (i)
  from (
select room
     , d
     , i
     , max (g) over (order by d) mg
  from
(select room
     , d
     , i
     , case when lead (i) over (partition by grp order by d) = i
       then rownum
       end  g
from (
select room
, d
, i
, d - rownum grp
from x
order by d
group by mg