Question

我的系统中有这些数据。将持续时间列设为NVARCHAR类型。

 | Site | Application |    Time Checked    | Duration |
 ------------------------------------------------------
    A        AAAA       1/11/2016 12:00AM      5.0s
    B        AAAA       1/11/2016 12:00AM      4.0s
    A        BBBB       1/11/2016 12:00AM      5.0s
    B        BBBB       1/11/2016 12:00AM      4.0s
    A        AAAA       1/11/2016 12:30AM      5.0s
    B        AAAA       1/11/2016 12:30AM      4.0s
    A        BBBB       1/11/2016 12:30AM      5.0s
    B        BBBB       1/11/2016 12:30AM      4.0s
 ......................................................
    A        AAAA       1/11/2016 11:00PM      5.0s
    B        AAAA       1/11/2016 11:00PM      4.0s
    A        BBBB       1/11/2016 11:00PM      5.0s
    B        BBBB       1/11/2016 11:00PM      4.0s
    A        AAAA       1/11/2016 11:30PM      5.0s
    B        AAAA       1/11/2016 11:30PM      4.0s
    A        BBBB       1/11/2016 11:30PM      5.0s
    B        BBBB       1/11/2016 11:30PM      4.0s
    A        AAAA       1/12/2016 12:00AM      5.0s
    B        AAAA       1/12/2016 12:00AM      4.0s
    A        BBBB       1/12/2016 12:00AM      5.0s
    B        BBBB       1/12/2016 12:00AM      4.0s
    A        AAAA       1/12/2016 12:30AM      5.0s
    B        AAAA       1/12/2016 12:30AM      4.0s
    A        BBBB       1/12/2016 12:30AM      5.0s
    B        BBBB       1/12/2016 12:30AM      4.0s
 ......................................................
    A        AAAA       1/12/2016 11:00PM      5.0s
    B        AAAA       1/12/2016 11:00PM      4.0s
    A        BBBB       1/12/2016 11:00PM      5.0s
    B        BBBB       1/12/2016 11:00PM      4.0s
    A        AAAA       1/12/2016 11:30PM      5.0s
    B        AAAA       1/12/2016 11:30PM      4.0s
    A        BBBB       1/12/2016 11:30PM      5.0s
    B        BBBB       1/12/2016 11:30PM      4.0s

我的系统每天检查持续时间每小时2次（从NN开始：00 AM / PM，接下来是NN：30 AM / PM）我需要获得不同站点每天的持续时间的总平均值和整个月的申请。

喜欢这个

 | (Site A) Ave.Duration | Day Time Checked | Application |
          5.4 s               1/11/2016          AAAA
          5.4 s               1/12/2016          AAAA
          5.4 s               1/13/2016          AAAA
 ..........................................................
          5.4 s               1/11/2016          BBBB
          5.4 s               1/12/2016          BBBB
          5.4 s               1/13/2016          BBBB
 ..........................................................

有人可以帮我这个吗？我已经在这里遇到了不同的问题。

但我还是不太明白。

你的回答将会很有帮助。

Answer 1

试试这个：一个完整的Demo

create table 
#test1
(
site char(1),
apl char(10),
timechecked datetime,
duration real,
)

insert into #test1
select 
'A','AAAA','1/11/2016 12:00AM',5.0s
union all
select
'B','BBBB','1/11/2016 12:30AM',4.0s
union all
select 
'A','BBBB','1/12/2016 12:00AM',5.0s

--nromal method
;with cte
as
(
select duration,convert(varchar(2),datepart(day,timechecked))+'/'+
convert(varchar(2),datepart(month,timechecked))+'/'+
convert(varchar(4),datepart(year,timechecked)) as datetimee,
apl
from
#test1
)
select 
avg(duration) as avgduration,
datetimee,apl
from
cte
group by datetimee,apl

---using window functions
;with cte
as
(
select duration,convert(varchar(2),datepart(day,timechecked))+'/'+
convert(varchar(2),datepart(month,timechecked))+'/'+
convert(varchar(4),datepart(year,timechecked)) as datetimee,
apl
from
#test1
)

select
avg(duration) over (partition by datetimee order by datetimee ) as avgduration,
datetimee,
apl
from cte

获取一个月中每天的平均时间 - SQL Server

1 个答案: