Question

我试图检索2015年每小时的平均交易量＆＃34;从SQL Server和我使用以下查询：

select 
    avg(Cast(a.Orders as float)) as AvgOrders, a.Hour
from 
    (select 
         count(*) as Orders, 
         datepart(hour,created) as Hour,
         datepart(day,created) as Day
    from 
        ORDERS
    where 
        --      datepart(month,created) = 1
        datepart(year,created) = 2015
        and DATENAME(dw, created) NOT IN ('Saturday', 'Sunday')
        and branchno in ('113', '120', '122')
        and (filing = 1 or delivery = 1)
    group by 
        datepart(hour, created),
        datepart(day, created)
    ) a
group by 
    a.Hour
order by 
    a.Hour

此查询为我提供了每小时数据，这似乎是不正确的（每小时约150次交易，我知道这是不正确的）。当我取消注释语句datepart(month, created) = 1并使用其中的任何月份时，数据接近每小时40个事务，这是正确的数据。

为什么我无法为整个2015年生成正确的数据？为什么在选择月度数据时会获得准确的数据？

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Answer 1

尝试这样的事情，在发生的那一天分别获得每小时。

select count(*) as Orders
    , cast(created as date) as Date
    , Datepart(hour, created) as Hour  
from ORDERS
group by cast(created as date)
    , Datepart(hour, created) 
order by Date, Hour

从SQL Server

1 个答案: