Question

I have a table with Products, Quantity and Weight. I need to find the heavier products that reach a certain value. Example:

Table:

Product     Qty Weight
PEN         100 50
PEN          10 30
PEN          80 20
PEN         250 20
PEN        1000 10
PAPER       150 80
PAPER      1500 20

Query: Find PEN that reach maximum 200 Qty ordered by Weight.

Result:

PEN         100 50
PEN          10 30
PEN          80 20

EDIT:
The result was that because: 100+10+80 < 200.

Answer 1

If you’re on SQL 2012, you can use this sort of approach for a running total:

Select
  Qty,
  Weight
From (
  Select
    Qty,
    Weight,
    Sum(Qty) Over(Order By Weight Desc Rows Between Unbounded Preceding And Current Row) As RunningQty
  From
    Test
  Where
    Product = 'PEN'
  ) a
Where
   RunningQty <= 200

http://sqlfiddle.com/#!6/6157b/4