Fetching Data frm Table

Question

SQL> create table leave (sid number(10), leave_type number(2), start_date date, end_date date, days number(3));
Table created.
SQL> insert into leave values (101, 12, '03-jan-2011', '05-jan-2011', 1);
1 row created.
SQL> insert into leave values (101, 12, '12-jan-2011', '12-Jan-2011', 1);
1 row created.
SQL> insert into leave values (101, 12, '21-jan-2011', '22-jan-2011', 2  );
1 row created.
SQL>  insert into leave values (101, 10, '26-jan-2011', '26-jan-2011', 1);
1 row created.
SQL> insert into leave values (101, 12, '14-feb-2011', '16-feb-2011', 3);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from leave;
SQL> select * from leave;
       SID LEAVE_TYPE START_DATE  END_DATE  javascript:void(0);        DAYS
       101         12 03-jan-2011 05-jan-2011          3
       101         12 12-jan-2011 12-jan-2011          1
       101         12 21-jan-2011 22-jan-2011          2
       101         10 26-jan-2011 26-jan-2011          1
       101         12 14-feb-2011 16-feb-2011          3Now, I have a date range as input for a specific SID. I would like the list the leave records in contiguous order for that date range. If date range input is between *'01-Jan-2011'* to *'31-Jan-2011'* then the result output should be :
SID     LEAVE_TYPE     ON_LEAVE
101     12          03-jan-2011
101     12          04-jan-2011
101     12          05-jan-2011
101     12          12-jan-2011
101     12          21-jan-2011
101     12          22-jan-2011
101     10          26-jan-2011Due to some restriction I can not create temporary table to implement this. Can anyone suggest me ways whether this can be achieved through SQL or I need to use PL/SQL ?

Answer 1

This would be the basic query to give the contiguous dates...
SQL> select sid, leave_type, start_date+rn-1 as leave_date
  2  from leave
  3       join (select rownum as rn from dual connect by rownum <= 31)
  4       on (rn <= days)
  5  order by leave_date
  6  /
       SID LEAVE_TYPE LEAVE_DATE
       101         12 03-JAN-2011
       101         12 04-JAN-2011
       101         12 05-JAN-2011
       101         12 12-JAN-2011
       101         12 21-JAN-2011
       101         12 22-JAN-2011
       101         10 26-JAN-2011
       101         12 14-FEB-2011
       101         12 15-FEB-2011
       101         12 16-FEB-2011
10 rows selected.Apply clauses to restrict to a particular date range as required.
Edit: This does assume that someone isn't going to have more than 31 days leave in any one go. If you need more, just change the 31 to whatever the maximum leave would be as appropriate.