Traversing through dates

Hi There,
Suppose I have a table in the following format,
id , start_dt, end_dt, transaction_dt.
Basically I will have a transaction for a contract whose start date and end date are start_dt and end_dt respectively, for a transaction date which is txn_dt. So I want to find out all the dates between start_dt and end_dt for which there is no transaction. Can you please suggest me a query or a logic?
Thanks,
JJ

As Rob already shows, the connect by sample seems not to be restrictive enough:
SQL>
SQL> with t
2 as
3 (
4      select 1 id, to_date('1/2/2007','dd-mm-yyyy') st, to_date('7/2/2007','dd-mm-yyyy') ed, to_date('1/2/2007','dd-mm-yyyy') tx from dual
5      union all
6      select 2 id, to_date('1/2/2007','dd-mm-yyyy') , to_date('7/2/2007','dd-mm-yyyy') , to_date('2/2/2007','dd-mm-yyyy') from dual
7      union all
8      select 3 id, to_date('1/2/2007','dd-mm-yyyy') , to_date('7/2/2007','dd-mm-yyyy') , to_date('3/2/2007','dd-mm-yyyy') from dual
9      union all
10      select 4 id, to_date('1/2/2007','dd-mm-yyyy') , to_date('7/2/2007','dd-mm-yyyy') , to_date('7/2/2007','dd-mm-yyyy') from dual
11      union all
12      select 5 as id, date '2008-01-01', date '2008-01-03', date '2008-01-02' from dual
13 )
14 select nt.dt
15    from t,
16          (select t1.st + (level-1) dt
17        from dual,(select min(st) st,max(ed) ed from t group by st,ed) t1
18      connect by level <= (t1.ed - t1.st)+1) nt
19   where t.tx(+) = nt.dt
20      and t.tx is null
21 order by nt.dt
22 /
DT
04.02.07
04.02.07
04.02.07
04.02.07
04.02.07
04.02.07
04.02.07
04.02.07
05.02.07
05.02.07
05.02.07
05.02.07
05.02.07
05.02.07
05.02.07
05.02.07
06.02.07
06.02.07
06.02.07
06.02.07
06.02.07
06.02.07
06.02.07
06.02.07
01.01.08
03.01.08
03.01.08
03.01.08
03.01.08
29 rows selected.This seems to work however using a row identifier and the DBMS_RANDOM trick to prevent the loop cycle detection:
SQL>
SQL> with mytable as (
2 select 1 as id, date '2007-02-01' as start_dt, date '2007-02-07' as end_dt, date '2007-02-01' as transaction_dt from dual union all
3 select 2, date '2007-02-01', date '2007-02-07', date '2007-02-02' from dual union all
4 select 3, date '2007-02-01', date '2007-02-07', date '2007-02-03' from dual union all
5 select 4, date '2007-02-01', date '2007-02-07', date '2007-02-07' from dual union all
6 select 5 as id, date '2008-01-01' as start_dt, date '2008-01-03' as end_dt, date '2008-01-02' as transaction_dt from dual),
7 distinct_periods1 as
8 ( select distinct start_dt startdate
9          , end_dt enddate
10       from mytable
11 ),
12 distinct_periods as
13 ( select rownum as rowno,
14            startdate
15          , enddate
16       from distinct_periods1
17 )
18 , all_days as
19 ( select startdate
20          , enddate
21          , startdate + level - 1 as day
22       from distinct_periods
23       connect by rowno = prior rowno
24       and prior dbms_random.value is not null
25       and level <= enddate - startdate + 1
26 )
27 select
28 startdate,
29 enddate,
30 day
31 from all_days
32 minus
33 select start_dt,end_dt,transaction_dt
34 from mytable;
STARTDAT ENDDATE DAY
01.02.07 07.02.07 04.02.07
01.02.07 07.02.07 05.02.07
01.02.07 07.02.07 06.02.07
01.01.08 03.01.08 01.01.08
01.01.08 03.01.08 03.01.08Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle:
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

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