sql server求分组最大值，最小值，最大值对应时间，和最小值对应时间

先创建Students表

CREATE TABLE [dbo].[Students](
[Id] [int] IDENTITY(1,1) NOT NULL,
[age] [int] NULL,
[name] [nvarchar](50) NULL,
[addTime] [datetime]  NULL
) ON [PRIMARY]

插入几条测试数据

INSERT [dbo].[Students] ([age], [name], [addTime]) VALUES (22, N'李四', '2015-04-08 01:00:00.000')
INSERT [dbo].[Students] ([age], [name], [addTime]) VALUES (8, N'李四', '2017-05-03 00:00:00.000')
INSERT [dbo].[Students] ([age], [name], [addTime]) VALUES (98, N'李四', '2017-10-03 00:00:00.000')
INSERT [dbo].[Students] ([age], [name], [addTime]) VALUES (34, N'张三', '2016-09-08 00:00:00.000')
INSERT [dbo].[Students] ([age], [name], [addTime]) VALUES (45, N'张三','2011-05-08 00:00:00.000')
INSERT [dbo].[Students] ( [age], [name], [addTime]) VALUES (5, N'张三', '2014-04-01 00:00:00.000')

第一种写法：

　　这种写法用到了窗口函数，窗口函数的行为描述出现在函数的OVER子句中，并涉及多个元素，3个核心元素分别是：分区，排序和框架

select distinct name,
maxAge, max(case maxAgenum when 1 then addtime else '' end) over(partition by name) maxAddTime ,
minage,max(case minAgenum when 1 then addtime else '' end) over(partition by name) minAddTime
from (
select name,addtime,
max(age) over(partition by name) maxAge,
min(age) over(partition by name) minAge,
RANK() over(partition by name order by age desc) maxAgeNum ,
RANK() over(partition by name order by age ) minAgeNum from students
) s

第二种写法：

with s as
(
select name,max(age) maxAge,min(age) minAge from students
group by name
)
select name,max(maxAge) maxAge,max(maxAgeTime) maxAgeTime,max(minAge) minAge,max(minAgeTime) minAgeTime from (
select ss.name,s.maxAge,ss.addTime maxAgeTime,0 minAge, '' minAgeTime from students ss inner join s on ss.name=s.name and ss.age=s.maxAge
union all
select ss.name,0 maxAge , '' maxAgeTime,s.minAge minAge,ss.addTime minAgeTime from students ss inner join s on ss.name=s.name and ss.age=s.minAge
) a group by name

结果如下图：

 

根据上面又延伸出来一个新需求。

求一天之内的最大值最小值   最大值时间最小值时间

select name,d '日期',maxAge,maxAddTime,minage,minAddTime from
(
          select distinct name,d,
          maxAge, max(case maxAgenum when 1 then addtime else '' end) over(partition by name,d) maxAddTime ,
          minage,max(case minAgenum when 1 then addtime else '' end) over(partition by name,d) minAddTime
          from
         (
              select name,addtime,DAY(addtime) d,
              max(age) over(partition by name,DAY(addtime)) maxAge,
              min(age) over(partition by name,DAY(addtime)) minAge,
              RANK() over(partition by name,DAY(addtime) order by age desc) maxAgeNum ,
              RANK() over(partition by name,DAY(addtime) order by age ) minAgeNum from students where addtime>='2017-5-1' and addtime<'2017-6-1'
         ) s
) a order by name,d