Select date/time groupings in MySQL grouped by hour

Question

I have a bunch of date data in a mysql table like this:

2010-02-13 1:00:00, \"soma data\"
2010-02-13 1:25:00, \"soma data\"
2010-02-13 1:37:00, \"soma data\"         


        

Answer 1

SELECT HOUR(datetime), COUNT(*)
FROM table
GROUP BY HOUR(datetime);

You will get two fields: the hour and the number of events during that hour.