Hi,
I have the following dataset:
Item | Date | Projected Inventory(PE) | Forecast(FC) |
A | Jan 28, 2019 | 604 | 50 |
A | Feb 04, 2019 | 630 | 52 |
A | Feb 11, 2019 | 1303 | 49 |
A | Feb 18, 2019 | 1257 | 46 |
A | Feb 25, 2019 | 1176 | 51 |
A | Mar 04, 2019 | 1136 | 55 |
A | Mar 11, 2019 | 1083 | 53 |
A | Mar 18, 2019 | 1030 | 53 |
A | Mar 25, 2019 | 980 | 50 |
A | Apr 01, 2019 | 900 | 65 |
A | Apr 08, 2019 | 853 | 62 |
A | Apr 15, 2019 | 944 | 59 |
A | Apr 22, 2019 | 1303 | 49 |
The Desired O/ P is:
Item | Date | Weeks On Hand |
A | Jan 28, 2019 | 11 |
A | Feb 04, 2019 | 12 |
A. | Feb 11, 2019 | 9 |
A | Feb 18, 2019 | 8 |
A | Feb 24, 2019 | 0 (there should be at least 10 weeks of Forecast for an item , if not the WOH = 0) |
A | ... | 0 |
The logic is as follows:
I need to calculate the number of weeks on hand for each item for that particular week based on forecast for several weeks going forward.
So for week of Jan 28, 2019 , the Projected Inventory is 604.
In order to calculate the Weeks On hand of Item A for week of Jan 28, 2019 the calculation is as follows:
FOR WEEK OF Jan 28, 2019:
Iteration 1:
604 – 50(FC for week 1) = 554
Weeks on Hand(WOH) = 0 + 1 = 1
Iteration 2:
554 – 52(FC for week 2) = 502
WOH = 1 + 1 = 2
Iteration 3:
502 – 49 (FC for week 3) = 453
WOH = 2 + 1 = 3
And so on…
Finally we get WOH = 11 for Item A for week of Jan 28, 2019.
FOR WEEK OF Feb,04 2019:
Iteration 1:
650 – 52(FC for week 2) = 598
Weeks on Hand(WOH) = 0 + 1 = 1
Iteration 2:
598 – 49(FC for week 2) = 549
WOH = 1 + 1 = 2
Iteration 3:
549 – 46 (FC for week 3) = 503
WOH = 2 + 1 = 3
And so on…
Finally we get WOH = 12 for Item A for week of Feb 04, 2019.
Similarly I need to calculate WOH for subsequent weeks and for different items
NOTE: Also there should be at least 10 weeks of Forecast for an item , if not the WOH = 0.
How to achieve this result in My SQL?
I am thinking Stored Procedures using cursors is the way to go. However I am not really familiar with Stored Procedure.
Is there an alternate method ? Any help will be appreciated.
Thanks in advance.
Prajwal
