Table Calculations: Running Total, % of Total, and Window Functions A running total is a sum of values in a set that are calculated and added to the orig...
A running total is a sum of values in a set that are calculated and added to the original sum as new values are added. This allows you to see the running total of a variable over time.
For example, let's say you have a dataset of sales figures for different products. You could use a running total to calculate the total sales for each product, showing how they have grown or declined over time.
Another important concept related to running totals is percent of total. This tells you the percentage of the total amount that each value represents. For instance, if you have a total of 100 and add five values, the percent of total for each value would be 5%.
Window functions provide an alternative approach to calculating running totals and percentages of total. They allow you to specify a window size and then use that window to calculate the values and percentages. This can be useful when you want to avoid the performance impact of using running totals or when you have a large dataset.
Here's an example of using running totals and window functions:
Calculate Running Total:
Running Total = Sum of values up to current position
Calculate % of Total:
% of Total = (Value / Total amount) * 100
By understanding these concepts, you can use them to create insightful data visualizations in Tableau or Power BI. By analyzing trends and patterns in your data over time, you can uncover valuable insights and make informed decisions