May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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Getting to know your data using statistical identities
Getting to know your data is vital so you can understand how to analyze and tell a story with it. There are a few built-in functions in MySQL that you can use to get to know your data, including the following:
- AVG: Returns the average of an expression
- COUNT: Returns the number of records
- MAX: Returns the maximum value in a set of values
- MIN: Returns the minimum value in a set of values
- ROUND: Rounds a number to a specified number of decimal places
- SUM: The sum of a set of values
- VARIANCE: Gives you the variance of your data
- STDDEV: Gives you the standard deviation of your data
Each of these was covered in more detail in Chapter 9, Working with Expressions. Please refer to that chapter ...
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