MYSQL查两个时间区间内有哪几个月分

SELECT

DISTINCT DATE_FORMAT(date_add(concat('2019-01-01'), INTERVAL(help_topic_id)DAY), '%Y-%m' ) DT

FROM

mysql.help_topic

WHERE

help_topic_id <= timestampdiff(DAY,concat('2019-01-01'), concat('2019-12-01'))

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//TODO

具体实现原理自己查是怎么回事吧，项目着急先实现了就，过后有功夫再来补充