摘要：
--统计每天指定时间段内的数据select count(*) as 每天数量, trunc(t.modify_dat,'DD')from t_total twhere t.modify_dat between to_date('2012-7-24','yyyy-mm-dd') and to_date('2012-7-30','yyyy-mm-dd') and to_number(to_char(t.modify_dat,'hh24')) between 12 and 14group by trunc 阅读全文