我有问题。我有以下列和示例数据的表:
RN Date Time
---------------------
1 2015-02-02 12
2 2015-02-02 25
3 2015-02-02 27
1 2015-02-08 42
2 2015-02-08 45
1 2015-03-01 60
2 2015-03-01 62
3 2015-03-01 63
4 2015-03-01 63
我需要在每天的时间开始和结束时间之间取得差异。
例如:
27-12
45-42
63-60
有什么建议吗? :)
答案 0 :(得分:1)
select
Date, max(Time) as mx, min(Time) as mn, max(Time) - min(Time) as diff
from table_name
group by Date