Sorry, didn'f find normal name for the topic.
I have the following situation.
Table:
Order nr. Item nr. Item name Quantity
1 x Full 1
2 y Empty -1
3 x Full 1
3 y Empty -1
4 x Full 1
4 x Full 1
4 y Empty -1
We deliver to clients product - bottles, and took from cliets back empty bottles (but now always we took empty bottles).
If driver deliver to client 1 Full bottle and get back 1 Empty bottles (+1 -1) this would count as value 1 (only one operation)
Similar, if driver deliver to client 2 Full bottle and get back 2 Empty bottles (+2 -2) this would count as value 2 (two operations)
If driver just deliver to client full bottles, this couns as SUM ... +1 = 1
If driver just get back empty bottoels, we count as positive SUM ... - 1 = 1.
So, I need to make such calculation:
- if we only took empty bootles - than value is positive (if sum = -1, the our values =1, if -2 , then 2 etc)
- if we give cliet full bootles - than we sum values
- if within ONE order we have -1 and +1 - than means we did an exchange and the result must be 1
- if within ONE order we have -2 and +1 - than result must be 1 (-1 and 1) + 1 (fabs -1) = 2
- if within ONE order we have -3 and +1 than result must be 1 (-1 and 1) + 1 +1 = 3
- if within ONE order we have -2 and +4 than result must be 2 (-2 and +2) + 1 +1 = 4
How can I make such calcutaions.
Thank you in advance!
