Working on a statistics plugin I needed a way to group records by the day. Turns out it’s remarkably easy.
SELECT COUNT(id), theDate FROM table GROUP BY YEAR(theDate), MONTH(theDate), DAY(theDate);
If you just want to group by year and month take off the DAY() part. This would also be a good query to use WEEK() on to pull records grouped by the week they were posted.
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