To display cumulative percent to total in SQL, we use the same idea as we saw in the Percent To Total section.
The difference is that we want the cumulative percent to total, not the percentage
contribution of each individual row. Let's use the following example to illuatrate:
we would type,
SELECT a1.Name, a1.Sales, SUM(a2.Sales)/(SELECT SUM(Sales) FROM Total_Sales) Pct_To_Total
FROM Total_Sales a1, Total_Sales a2
WHERE a1.Sales <= a2.sales or (a1.Sales=a2.Sales and a1.Name = a2.Name)
GROUP BY a1.Name, a1.Sales
ORDER BY a1.Sales DESC, a1.Name DESC;
The subquery "SELECT SUM(Sales) FROM Total_Sales" calculates the sum. We can then divide the running total, "SUM(a2.Sales)", by this sum to obtain the cumulative percent to total for each row.
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