Question

I’m trying to group by Date(). I’ve got 3 records with the created_at column:

2011-12-03 08:00:24, 2011-12-03 08:12:10, 2011-12-04 09:00:00

I’d like to only group by year, month and day, regardless of time. So for the example above. It should only return two rows:

2011-12-03 and 2011-12-04

How should I go about this?

Answer 1

This should allow you to group by year month and day

 SELECT group_by_column
      , DATE_FORMAT(created_at, '%Y')
      , DATE_FORMAT(created_at, '%m')
      , DATE_FORMAT(created_at, '%d')
   FROM my_table
  GROUP BY group_by_column

or if you want to do them all together.

 SELECT group_by_column
      , DATE_FORMAT(created_at, '%Y%m%d')
   FROM my_table
  GROUP BY group_by_column