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> Subtract The Previous Vale From The Current Value, Access 2007    
 
   
Swartmoer
post Mar 26 2020, 10:47 AM
Post#1



Posts: 1
Joined: 26-March 20



I have a table with readings from the gauge of a diesel engine ( unit=hours). How do I continuously subtract the previous reading from the current reading in a query to get the hours between the readings?

The reading in ID1 (8006) must be subtracted from ID2 (8023) to give me an answer of 17, the next record will be 7, then 14 etc.

ID Date Reading Result
1 10-Jan-20 8006 0
2 14-Jan-20 8023 17
3 15-Jan-20 8030 7
4 16-Jan-20 8044 14

Pardon the elementary question but any help will be apreciated.

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theDBguy
post Mar 26 2020, 11:02 AM
Post#2


UA Moderator
Posts: 77,704
Joined: 19-June 07
From: SunnySandyEggo


Hi. Welcome to UtterAccess! welcome2UA.gif

You can use a subquery or DLookup() to get the value from a previous record. Take a look here for some explanation.

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RSSSearch   Top   Lo-Fi    29th March 2020 - 03:49 AM