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SQL query - inclue only work days

Posted on 2006-10-26
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Last Modified: 2008-01-09
Hi experts,

I have to create a query that determines the difference in time between two dates and then calculate the average time difference based on a grouping of another field. There is a trick however - the calculation of the difference in time should exclude Saturdays and Sundays. The query as follows:

SELECT t.name, AVG(DATEDIFF(dd,t.dateone,t.datetwo) AS time
FROM db.dbo.table t
GROUP BY t.name

I have no idea how to do the exclusion of  Saturdays and Sundays in the calculation. Any help would be much appreciated.

Thanks!
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Question by:avdvyver
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6 Comments
 

Author Comment

by:avdvyver
ID: 17810844
My apologies - the query as follows:

SELECT t.name, AVG(DATEDIFF(dd,t.dateone,t.datetwo)) AS time
FROM db.dbo.table t
GROUP BY t.name
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LVL 75

Accepted Solution

by:
Aneesh Retnakaran earned 500 total points
ID: 17810880
use this function to get the no of working days b/w 2 dates

CREATE FUNCTION dbo.GetWorkingDays
( @StartDate datetime,
@EndDate datetime )
RETURNS INT
AS
BEGIN
DECLARE @WorkDays int, @FirstPart int
DECLARE @FirstNum int, @TotalDays int
DECLARE @LastNum int, @LastPart int
IF (DATEDIFF(day, @StartDate, @EndDate) < 2)
BEGIN
RETURN ( 0 )
END
SELECT
@TotalDays = DATEDIFF(day, @StartDate, @EndDate) - 1,
@FirstPart = CASE DATENAME(weekday, @StartDate)
WHEN 'Sunday' THEN 6
WHEN 'Monday' THEN 5
WHEN 'Tuesday' THEN 4
WHEN 'Wednesday' THEN 3
WHEN 'Thursday' THEN 2
WHEN 'Friday' THEN 1
WHEN 'Saturday' THEN 0
END,
@FirstNum = CASE DATENAME(weekday, @StartDate)
WHEN 'Sunday' THEN 5
WHEN 'Monday' THEN 4
WHEN 'Tuesday' THEN 3
WHEN 'Wednesday' THEN 2
WHEN 'Thursday' THEN 1
WHEN 'Friday' THEN 0
WHEN 'Saturday' THEN 0
END
IF (@TotalDays < @FirstPart)
BEGIN
SELECT @WorkDays = @TotalDays
END
ELSE
BEGIN
SELECT @WorkDays = (@TotalDays - @FirstPart) / 7
SELECT @LastPart = (@TotalDays - @FirstPart) % 7
SELECT @LastNum = CASE
WHEN (@LastPart <> 0) THEN @LastPart - 1
ELSE 0
END
SELECT @WorkDays = @WorkDays * 5 + @FirstNum + @LastNum
END
RETURN ( @WorkDays )
END
GO

0
 
LVL 92

Expert Comment

by:Patrick Matthews
ID: 17810922
Hi avdvyver,

Aneesh's function will get you there, unless you have to consider "holidays", days that are Mon-Fri but for
one reason or another should not be counted as work days.  Will you need to do this?  If so, then you would
have to maintain a table of such days, and modify Aneesh's function to refer to that table.

Regards,

Patrick
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Author Comment

by:avdvyver
ID: 17810931
Hi Patrick,

Luckly I don't have to cater for holiday during the working week.
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Author Comment

by:avdvyver
ID: 17811016
Hi aneeshattingal,

I don't want to sound stuipd ... but I don't understand where the origional query fits into your answer. I'm sure it works, I just don't know where exactly to fit my query in. :)
0
 
LVL 75

Expert Comment

by:Aneesh Retnakaran
ID: 17811025
SELECT t.name, AVG(dbo.GetWorkingdays(t.dateone,t.datetwo) AS time
FROM db.dbo.table t
GROUP BY t.name
0

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Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

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