Question

我的CMS表包含CMS_STARTTIME和CMS_STOPTIME（附件）。
alt text http://img339.imageshack.us/img339/755/exdatabase.jpg

我想创建报告，通过使用日期，时间和年份作为参数（附件）来汇总现有数据。
alt text http://img444.imageshack.us/img444/3508/reportdailyen.jpg

我不知道如何创建sql语句来满足这个要求。我正在使用MySQL和MS-SQL。有人可以帮忙吗？
非常感谢你。

Answer 1

这是SQL Server的解决方案

SELECT 
 DATEPART(hh,CMS_StartTime)  AS HourOfDay, 
 COUNT(*)              AS NumMsgs, 
 SUM(DATEDIFF(mi,CMS_StartTime,CMS_STOPTIME)) AS TotalTimeInMinutes,
 AVG(DATEDIFF(mi,CMS_StartTime,CMS_STOPTIME)) AS AvgTimeBetweenInMinutes
FROM 
      MyTable   
WHERE CMS_StartTime
      BETWEEN 'may 1 2010' AND 'may 2 2010'
GROUP BY
      DATEPART(hh,CMS_StartTime)

Answer 2

要使其工作，您需要一个Numbers或Tally表，其中包含从零开始的整数顺序列表。在我的示例中，我的Numbers表看起来像：

Create Table Numbers ( Value int not null primary key )

使用它并在SQL Server中执行此操作，您可以执行以下操作：

Select N.Value As [Hour]
    , Count(T.StartDate) As CallCount
    , Sum(DateDiff(mi, T.StartDate, T.EndDate)) As [TotalTime(mi)]
    , Avg(DateDiff(mi, T.StartDate, T.EndDate)) As [AvgTime(mi)]
From Numbers As N
    Left Join Table As T
        On DatePart(hh, T.StartDate) = N.Value
Where N.Value Between 0 And 23  
Group By N.Value

由于你没有指定，我假设一个呼叫在给定的小时内计数，如果它在那个小时开始。一个参数可能会使一个小时内的呼叫计算在一个小时内开始或结束，这会产生重复计算，但会告诉您在一天中的给定时间内正在进行的呼叫数量。为此，需要更改上面的查询以将以下内容添加到On子句Or DatePart(hh, T.EndDate) = N.Value。

我相信MySql的等价物是：

Select N.Value As [Hour]
    , Count(T.StartDate) As CallCount
    , Sum( TimestampDiff(MINUTE, T.StartDate, T.EndDate) ) As [TotalTime(mi)]
    , Avg( TimestampDiff(MINUTE, T.StartDate, T.EndDate) ) As [AvgTime(mi)]
From Numbers As N
    Left Join Table As T
        On Hour(T.StartDate) = N.Value
Where N.Value >= 0 And N.Value <= 23    
Group By N.Value

使用SQL语句汇总数据

2 个答案: