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group by month and year with this format "01/29/2016"


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Use str_to_date() to convert your format to to DATE type. Then you can use the other datetime functions on it.


    YEAR(STR_TO_DATE(datestr, '%m/%d/%Y')) as yr
,   MONTH(STR_TO_DATE(datestr, '%m/%d/%Y')) as mth
,   COUNT(*) as total
FROM mytable
GROUP BY yr, mth

You can use the same function to update your database table with a single query.

  • Backup the table, just in case
  • UPDATE mytable SET datestr = STR_TO_DATE(datestr, '%m/%d/%Y');
  • Alter varchar to DATE
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