MySQL STDDEV_POP() function
MySQL STDDEV_POP() function returns the population standard deviation of an expression ( the square root of VAR_POP()). Statistically, the population standard deviation quantifies how much variation there is in a dataset.
It returns NULL if no matching row is found.
This function is useful in -
- The primary purpose of the STDDEV_POP() function is to accurately calculate the population standard deviation.
- STDDEV_POP() quantifies the spread or dispersion of values around the mean (average) in a dataset.
- The population standard deviation helps you understand the variability or consistency of data points within the entire population.
- Population standard deviation is used to calculate confidence intervals for population parameters.
- You can use population standard deviation to compare the variability of different populations or datasets and assess their similarity or difference.
- In finance and risk analysis, population standard deviation is used to measure the volatility or risk associated with investment returns or financial instruments.
Where expr is an expression.
MySQL Version: 8.0
Example: MySQL STDDEV_POP() function
The following statement returns the standard deviation of 'total_cost' from purchase table.
Sample table: purchase
SELECT STDDEV_POP(total_cost) FROM purchase;
mysql> SELECT STDDEV_POP(total_cost) -> FROM purchase; +------------------------+ | STDDEV_POP(total_cost) | +------------------------+ | 315.392172 | +------------------------+ 1 row in set (0.00 sec)
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