>>>hi all :
>>>
>>>Hi was trying to make a column with the total's of the other two and paste the result to the next row .... more or less like this:
>>>
>>>Col a - Col b = total
>>>10 0 10
>>>0 15 -5
>>>
>>>Etc...
>>>Can i do This with a SQL ? I tryed to use :
>>>SELECT a,b, SUM(a+b) as total
>>>but it always gives me just one record (with -5)!
>>>
>>>Thanks in Advance !
>>
>>Don't use the SUM(), SUM() will always go an aggregate based on either ALL RECORDS, or a given group by...
>>
>>select a, b, a-b as total from mytable...
>
>
>First , Thanks for your reply .
>
>But That only give me (a-b) for current record .
>What i would like to get is (a-b) from the previous record plus (a-b) from the current record.
>EX:
>10-1 = 9
>10-5 (= 5+9) = 14

It's better to do it with SCAN:
select mytable
nTotal=0
scan
nTotal=nTotal+mytable.field1-mytable.field2
Replace mytable.total with nTotal
endscan