Oracle Query选择员工

Question

我的数据库记录和TIME_IO是oracle db的时间戳字段。

我需要一个查询来选择这种格式的记录，查询应该返回每天和每位员工的最小和最大TIME_IO。

Answer 1

从这个开始

select TRUNC(timeio) as day_timeio, min(timeio) as min_timeoi, 
        max(timeio) as max_timeoi 
 from table
        group by TRUNC(timeio)