一、日期格式转换

1.字符日期格式转化为UNIX时间戳格式

字段endtime为内容为UNIX时间戳格式，例如1346650755

select * fromtest where endtime >= extract(epoch FROM date('2012-09-03 00:00:00'));

2.UNIX时间戳转化为字符日期格式

select * fromtest where date(to_timestamp(endtime))>='2012-09-02';

select uid,date(to_timestamp(insert_time)),count(*) from pubinfo where uid in (56,57,58,59,60) group by uid,date(to_timestamp(insert_time)) order by uid,date(to_timestamp(insert_time))