May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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Statistical aggregate functions
In order to calculate standard descriptive statistics, you can use the following built-in functions:
- VARIANCE: This gives you the variance of your data, which calculates what the difference is for each individual point and the mean of all the points. If zero is returned, then all the data points are the same. A larger value returned means that individual data points are farther from the mean.
- STDDEV: This gives you the standard deviation, which helps you understand how spread out your data is, as well as how close each individual data point is to the mean (you calculate the mean by using the AVG built-in function). If zero is returned, then all the data points are exactly the same. A larger value returned ...
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