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Generating Average time difference between 2 dates in MS Access (SQL)

Posted on 2004-10-15
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Last Modified: 2008-03-10

I have a table with this structure in Access database

tbl_issue
 - ID             (autonumber)
 - fldSTART       (Date/Time)
 - fldUPDATED     (Date/Time)


Now I need to find out the average difference between the 2 dates above
for all records. Question is how would I go about it ?
Thanks in advance.
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Question by:vpekulas
7 Comments
 
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Accepted Solution

by:
Eric Flamm earned 300 total points
ID: 12323637
SELECT Avg(DateDiff("d",[fldStart],[fldUpdated])) AS Expr1
FROM tbl_issue

This will give you the average in days ("d") - check help on DateDiff for more options.

-ef
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LVL 12

Expert Comment

by:pique_tech
ID: 12323657
In a query, you'd need a field defined as:  (this will return minutes, if you want hours, change "n" to "h", days "d", etc)

AvgDifference:  Avg(DateDiff("n",fldSTART,fldUPDATED))
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LVL 16

Expert Comment

by:Nestorio
ID: 12323667
Select avg(fldUPDATED - fldSTART) from YourTable

How do you want to express the average? (hours, minutes, seconds)
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LVL 16

Expert Comment

by:Nestorio
ID: 12323695
Select Format(avg(fldUPDATED - fldSTART), "dd hh:nn:ss") from YourTable
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LVL 6

Expert Comment

by:mcorrente
ID: 12323697
SELECT Avg(DateDiff("d",[fldstart],[fldupdated])) AS Expr1
FROM tbl_issue;
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LVL 6

Expert Comment

by:mcorrente
ID: 12323702
wow... everyone at once.
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Author Comment

by:vpekulas
ID: 12323967
Thanks guys, exactly what I needed :)
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