“Don’t count the days, make the days count.”
- Mohammed Ali
This ANSI version of CSUM is SUM() Over. Right now, the syntax wants to see the sum of the Daily_Sales after it is first sorted by Sale_Date. Rows Unbounded Preceding makes this a CSUM. The ANSI Syntax seems difficult, but only at first.
SELECT Product_ID , Sale_Date, Daily_Sales,
SUM(Daily_Sales) OVER (ORDER BY Sale_Date
ROWS UNBOUNDED PRECEDING) AS SUMOVER
FROM Sales_Table WHERE Product_ID BETWEEN 1000 and 2000 ;