时间比较的方式
查询写文章的时间列表
select distinct DATE_FORMAT(a.last_modify_time,'%Y年%m月') as yearmonth from article as a where a.userid=1
查询某个月的文章信息
select * from note where date_format(time, '%Y%m ')= '200705 '判断一个时间是否在一个区间内
select * from table where unix_timestamp( time ) between unix_time_stamp( start ) and unix_timestamp( end )