Count between

Hi,
I'm primarily a Java developer, but I have to write a reporting tool in a proprietary framework (read as inflexible framework). I'm stuck with a legacy database. I have a table containing a log of events belonging to different users:
Username Event time Event type
user1 time1 Start
user1 time2 Notify
user1 time3 Notify
user1 time4 Stop
I have 3 types of events, say start, notify and stop. I have to generate a report containing the number of notify's between each start and stop. Is there a way to do this without having to join the table a few times with itself? I also thought of writing a PL/SQL query (but I cannot use functions, so I'll end up with a huge loop with a horrible amount of if then else blocks)
Thanks in advance!
Peter

or, if there can be more Start and Stop events:
SQL> create table mytable
2 as
3 select 'user1' username, sysdate-3 time, 'Start' event_type from dual union all
4 select 'user1', sysdate - 2, 'Notify' from dual union all
5 select 'user1', sysdate - 1, 'Notify' from dual union all
6 select 'user1', sysdate, 'Stop' from dual union all
7 select 'user2', sysdate - 6, 'Start' from dual union all
8 select 'user2', sysdate - 5, 'Notify' from dual union all
9 select 'user2', sysdate - 4, 'Notify' from dual union all
10 select 'user2', sysdate - 3, 'Notify' from dual union all
11 select 'user2', sysdate - 2, 'Stop' from dual union all
12 select 'user2', sysdate - 1, 'Stop' from dual
13 /
Tabel is aangemaakt.
SQL> select username
2       , count(case when time between latest_start_time+1/86400 and first_stop_time-1/86400 then 1 end) count_between
3    from ( select username
4                , time
5                , first_value(time) over (partition by username order by decode(event_type,'Start',0,1),time desc) latest_start_time
6                , first_value(time) over (partition by username order by decode(event_type,'Stop', 0,1),time) first_stop_time
7             from mytable
8         )
9   group by username
10 /
USERN COUNT_BETWEEN
user1             2
user2             3
2 rijen zijn geselecteerd.Regards,
Rob.

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Count between two dates.

dear friends
i want fetch count between two dates.
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its given out like -13 but i want in positive mod like 13 only not '-' Sign.

just use abs() function to your query to get the positive value
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Here are examples:
Mar 10, 2013 = 69 days from 31-DEC-2012
Mar 11, 2013 = 69 days from 31-DEC-2012
Mar 12, 2013 = 70 days from 31-DEC-2012
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March 11 should be 70, and March 12 should be 71. November 3 should be 307, and November 4 corrects the wrong count which began March 11.
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var w1= ($v("P48_PAST_DATE"));
w1 = (w1.toString());
var vmon = (w1.substr(3,3));
var vyr = (w1.substr(7));
var r = (vyr.length);
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Did you google for something like "javascript number of days between two dates". I think you will find the explanation in this observation:
This method doesn't work properly if there's a daylight savings jump between the two dates.
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Count between (1 table)

I want ONLY the IDs which:
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1     POL     0902
1     OOP     1006
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