查询一个月最后一天的总用户数，数据库中没有保存最好一天的数据
select total_user from a_user_no where date_time=(select max(date_time) from a_user_no where ‘2013-05’ '=to_char(date_time,‘yyyy-mm’)); 通过max 函数来去5月份出现最大日期的数据
select total_user from a_user_no where date_time=(select max(date_time) from a_user_no where
‘2013-05’+ "'=to_char(date_time,‘yyyy-mm’));
通过max 函数来去5月份出现最大日期的数据
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