“The best we can do is size up the chances, calculate the risks involved, estimate our ability to deal with them, and then make our plans with confidence.”
- Henry Ford
On-Line Analytical Processing (OLAP) or Ordered Analytics
OLAP is often called Ordered Analytics because the first thing every OLAP does before any calculating is SORT all the rows. The query above sorts by Sale_Date!
Cumulative Sum (CSUM) Command and how OLAP Works
SELECT Product_ID , Sale_Date, Daily_Sales
,CSUM(Daily_Sales, Sale_Date) AS “CSum”
FROM Sales_Table ;
Not all rows are displayed in this answer ...