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DateDiff in the Same Column Upload Images   Link  
Achaiki Diachiristiki 
18 months ago
Dear Richard
I am Vassilis from Greece and I would like to ask about a problem
I have a table with fields like Id. date field, numeric field etc.
What I would like is a query  that will show me the difference (DateDiff) of the days in the same column of the table as well as the difference (subtraction or addition) of fields in the same column.
Richard Rost
18 months ago
I don't understand what you mean by "in the same column." Are you trying to calculate the difference between, say, two fields? Day1 and Day2? If that's the case just use query criteria and some math like:

NumDays: Day2-Day1

Unless I'm not understanding you correctly.
Achaiki Diachiristiki
18 months ago
Imagine a table with only two fields date and value, this table contains four entries. We asking the difference of days and values between entry [date] to entry [date] in the next line
Achaiki Diachiristiki
18 months ago
We are talking about only one field, it is called [date1] which should be compared to the same field [date1] in the next line of table (next entry)
Richard Rost
18 months ago
So like this:

Date, Difference
1/1/2000, NULL
1/3/2000, 2
1/10/2000, 7
1/20/2000, 10


Where each line in the query shows the difference between the last date before it and the date in the record itself? You can do this with DMAX. If you can't figure it out let me know and I'll add it to the TechHelp list.
Achaiki Diachiristiki
18 months ago
I cant understand how the Dmax will detect the previous date
Dmax(date,tablename,date =;;;;)
Thanks
Richard Rost
18 months ago
Easier to explain in a video. I'll add it to the list.
Achaiki Diachiristiki
18 months ago
ok thanks
Richard Rost
18 months ago
Here you go: DMax

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