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    <p>My production code based on local guru advises and @Ben technique:</p> <pre> -- generate sequence 1..N: SELECT level FROM dual CONNECT BY level &lt;= 4; -- generates days: select to_date('01-01-2012','DD-MM-YYYY') + level - 1 from dual connect by level &lt;= to_date('31-12-2012','DD-MM-YYYY') - to_date('01-01-2012','DD-MM-YYYY') + 1; with dates as ( select (to_date('01-01-2012','DD-MM-YYYY') + level - 1) as daterange from dual connect by level &lt;= to_date('31-12-2012','DD-MM-YYYY') - to_date('01-01-2012','DD-MM-YYYY') + 1 ) select sum(tbl.cnt) as summ, trunc(dates.daterange, 'DDD') from dates left outer join DATA_TBL tbl on trunc(tbl.inc_date, 'DDD') = trunc(dates.daterange, 'DDD') group by trunc(dates.daterange, 'DDD') order by trunc(dates.daterange, 'DDD'); -- generates months: select ADD_MONTHS(to_date('01-01-2012','DD-MM-YYYY'), level - 1) from dual connect by level &lt;= months_between(to_date('31-12-2012','DD-MM-YYYY'), to_date('01-01-2012','DD-MM-YYYY')) + 1; with dates as ( select add_months(to_date('01-01-2012','DD-MM-YYYY'), level-1) as daterange from dual connect by level &lt;= months_between(to_date('31-12-2012','DD-MM-YYYY'), to_date('01-01-2012','DD-MM-YYYY')) + 1 ) select sum(tbl.cnt) as summ, trunc(dates.daterange, 'MM') from dates left outer join DATA_TBL tbl on trunc(tbl.inc_date, 'MM') = trunc(dates.daterange, 'MM') group by trunc(dates.daterange, 'MM') order by trunc(dates.daterange, 'MM'); -- generates quarters: select ADD_MONTHS(to_date('01-01-2012','DD-MM-YYYY'), (level-1)*3) from dual connect by level &lt;= months_between(to_date('31-12-2012','DD-MM-YYYY'), to_date('01-01-2012','DD-MM-YYYY'))/3 + 1; with dates as ( select add_months(to_date('01-01-2012','DD-MM-YYYY'), (level-1)*3) as daterange from dual connect by level &lt;= months_between(to_date('31-12-2012','DD-MM-YYYY'), to_date('01-01-2012','DD-MM-YYYY'))/3 + 1 ) select sum(tbl.cnt) as summ, trunc(dates.daterange, 'Q') from dates left outer join DATA_TBL tbl on trunc(tbl.inc_date, 'Q') = trunc(dates.daterange, 'Q') group by trunc(dates.daterange, 'Q') order by trunc(dates.daterange, 'Q'); -- generates years: select add_months(to_date('01-01-2007','DD-MM-YYYY'), (level-1)*12) from dual connect by level &lt;= months_between(to_date('31-01-2012','DD-MM-YYYY'), to_date('01-01-2007','DD-MM-YYYY'))/12 + 1; with dates as ( select add_months(to_date('01-01-2007','DD-MM-YYYY'), (level-1)*12) as daterange from dual connect by level &lt;= months_between(to_date('31-01-2012','DD-MM-YYYY'), to_date('01-01-2007','DD-MM-YYYY'))/12 + 1 ) select sum(tbl.cnt) as summ, trunc(dates.daterange, 'YYYY') from dates left outer join DATA_TBL tbl on trunc(tbl.inc_date, 'YYYY') = trunc(dates.daterange, 'YYYY') group by trunc(dates.daterange, 'YYYY') order by trunc(dates.daterange, 'YYYY'); </pre> <p>But <strong>connect by level</strong> is hack according to:</p> <ul> <li><a href="http://www.sqlsnippets.com/en/topic-11821.html" rel="nofollow">http://www.sqlsnippets.com/en/topic-11821.html</a> (Gotchas. To Use PRIOR or Not to Use PRIOR, That is the Question)</li> </ul>
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