SQL group by date (hour)

Question

I have a Table with a \"Date\" Column. I want to group by hour for a specific date.

Answer 1

select to_char(datecol,'HH24') thehour, count(*) count_in_hour
from tbl
where datecol = date '20110224'
group by to_char(datecol,'HH24')
order by thehour asc