How to separate a record to get the amount

Question

I got total 160 Quantity in the Stock.

How to get first 100 quantity total amount and last 60 quantity total amount?

The table is sort by Date and Stock ID.

Answer 1

For first 100

select Product ID, sum(Quantity) as Quantity, sum(Amount) as TotalAmount from (SELECT * from tblstock order by tblStock.Stock ID ASC limit 100) t1 GROUP BY Date,Product ID

For last 60

select Product ID, sum(Quantity) as Quantity, sum(Amount) as Total Amount from (SELECT * from tblstock order by tblStock.Stock ID DESC limit 60) t1 GROUP BY Date,Product ID