Select between dates in Oracle SQL

SQL> with t as (select to_date('01/01/2007','dd/mm/yyyy') as update_date from dual union all
 2             select to_date('01/01/2007','dd/mm/yyyy') from dual union all
 3             select to_date('03/01/2007','dd/mm/yyyy') from dual union all
 4             select to_date('03/01/2007','dd/mm/yyyy') from dual union all
 5             select to_date('03/01/2007','dd/mm/yyyy') from dual union all
 6             select to_date('04/01/2007','dd/mm/yyyy') from dual union all
 7             select to_date('05/01/2007','dd/mm/yyyy') from dual union all
 8             select to_date('07/01/2007','dd/mm/yyyy') from dual union all
 9             select to_date('07/01/2007','dd/mm/yyyy') from dual)
10  -- end of test data
11  select to_char(x.UPDATE_DATE, 'YYYY-MM-DD') as update_date, DECODE(t.update_date, NULL, 0, count (*)) as count
12  from (select to_date('2007-01-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS')+(rownum-1) as update_date
13        from   dual
14        connect by rownum <= (to_date('2007-02-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS') -
15                              to_date('2007-01-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS'))) x
16        LEFT OUTER JOIN t ON (x.update_date = t.update_date)
17  where x.UPDATE_DATE >= to_date('2007-01-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS')
18  and x.UPDATE_DATE < color="navy">'2007-02-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS')
19  group by to_char(x.UPDATE_DATE, 'YYYY-MM-DD'), t.update_date
20  order by 1
21  /

UPDATE_DAT      COUNT
---------- ----------
2007-01-01          2
2007-01-02          0
2007-01-03          3
2007-01-04          1
2007-01-05          1