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> Please Help A Struggling Newbie, Access 2016    
 
   
StillConfusedUK
post Jan 15 2020, 05:38 PM
Post#1



Posts: 2
Joined: 6-July 19



I know this must have been covered before but I'm really struggling with this.
I want to calculate MPG between fill ups for one vehicle only.
I have a table that has the following fields:

fuel ID Gallons Odometer TankMiles
1 12 19340
2 6 19680
3 8 20458

How do I calculate the TankMiles column.
I know I have to get the Odometer value from the previous record then subtract that from the latest one.
I am trying to use the expression builder to create a new field called TankMiles but i am struggling with formula and syntax.
I am trying to use Dlookup and Dmax but its not working for me.
I may have to delete a record at some stage and then the ID will be out of sequence so I know I have to account for this.
I am sorry to burden you all with such a stupid newbie question but I have looked all over the internet and I think I am struggling as much with the question and just can't find the answer.

Thanks
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isladogs
post Jan 15 2020, 05:55 PM
Post#2


UtterAccess VIP
Posts: 2,088
Joined: 4-June 18
From: Somerset, UK


Crossposted with a reply at https://www.access-programmers.co.UK/forums...ad.php?t=308991

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Colin (Mendip Data Systems)
Website, email
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June7
post Jan 15 2020, 05:56 PM
Post#3



Posts: 1,153
Joined: 25-January 16
From: The Great Land


See if this helps http://allenbrowne.com/subquery-01.html#AnotherRecord

Actually, ID gap is irrelevant.

This post has been edited by June7: Jan 15 2020, 05:56 PM

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Attachments Manager is below the edit post window. To provide db: copy, remove confidential data, run compact & repair, zip w/Windows Compression.
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GroverParkGeorge
post Jan 15 2020, 06:02 PM
Post#4


UA Admin
Posts: 36,515
Joined: 20-June 02
From: Newcastle, WA


Welcome to UtterAccess.

We all started somewhere, so there's no reason to apologize or feel bad about asking "newbie questions". It's the way we learn, as a matter of fact.

If you have trouble applying the solution illustrated in the Allen Browne article, post back and we'll delve in further.
This post has been edited by GroverParkGeorge: Jan 15 2020, 06:03 PM

--------------------
My Real Name Is George. Grover Park Consulting is where I did business for 20 years.
How to Ask a Good Question
Beginning SQL Server
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StillConfusedUK
post Jan 16 2020, 08:46 AM
Post#5



Posts: 2
Joined: 6-July 19



thank you so much for your kind help and advice
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