Fetch last match data..

table
id carno houseno entrytime exit time
1 11 333 3/4/2014 3:15:18 PM   3/4/2014 3:25:18 PM
2 11 333 3/4/2014 3:35:18 PM   3/4/2014 3:45:18 PM
3 11 333 3/4/2014 3:55:18 PM   3/4/2014 4:25:18 PM
4 14 33 3/4/2014 4:35:18 PM   3/4/2014 5:25:18 PM
5 15 544 3/4/2014 6:35:18 PM   3/4/2014 7:25:18 PM
6 11 333 4/4/2014 3:55:18 PM null
7 15 544 6/4/2014 3:55:18 PM 6/4/2014 4:25:18 PM
this is my table structure.............
so my query is i want to search row which use where clause to match carno and houseno.....in my table so many place carno and houseno are same but only timings are different ..i want to select the last entry which matchs...
example i give input houseno-333 and carno-11 then i want to serch last entry for this same houseno and carno...that means id-6 will be fetch.......how to achieve this.....i m able to fetch last record with where clause like house no and carno condition.....then
i want to check is exit time in null in dis row or having some value...
fynl summary i want to retrive last row based on where clause after retrivinbg i want to check value of exit column....
is it blank or some value in exit time..

there are so many issue arise when i test with dummy values..
some chnges.....
id carno houseno entrytime exit time
1 11 333 3/4/2014 3:15:18 PM null
2 11 333 null 3/4/2014 3:45:18 PM
3 11 333 3/4/2014 3:55:18 PM null
4 14 33 null 3/4/2014 5:25:18 PM
5 15 544 3/4/2014 6:35:18 PM null
6 11 333 4/4/2014 3:55:18 PM null
7 15 544 6/4/2014 3:55:18 PM null
now i have to find if there is two simulatneously entry happening in a sequence means without exit
between two entry of same carno and house no.. thn i need to beep alarm.....if entry tym is store then it should exit first for reenter again....if somehave two duplicate id of card no and house no..then we need to find duplicate of id....this
is rfid tag which is used for enter in a society,,,,entry gate will open after identify this tag
example/////// id-5 carno-15 enter at 3/4/2014 6:35:18 PM means last entry inserted...after tht no exit
happen for this carno and houseno.......at 7 id it will try again to enter..but it doesnot have exit so we need to restrict this.......

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1. Oracle version (e.g. 10.2.0.4)
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