SELECT CONCAT(SUBSTRING(DATE_FORMAT(`request_date`, '%M'),1,3),DATE_FORMAT(`request_date`,'-%Y')) as dateName, COUNT(*)
FROM foo
WHERE PERIOD_DIFF(DATE_FORMAT(NOW(), '%Y%m'), DATE_FORMAT(`request_date`, '%Y%m'))<12
GROUP BY YEAR(`request_date`), MONTH(`request_date`)

结果:

dateName    COUNT(*)
Sep-2014    1
Jun-2015    1
Jul-2015    1
Aug-2015    2