MySQL VARIANCE() function
MySQL VARIANCE() function returns the population standard variance of an expression. It considers the entire dataset rather than just a sample. Variance is a statistical measure that indicates the spread or dispersion of a dataset.
This function is useful in -
- It's essential for understanding the distribution of data.
- High variance indicates greater dispersion, while low variance suggests data points are closer to the mean.
- Variance can identify outliers or extreme values in dataset. Unusually high variances might signal data quality issues or anomalies.
- In finance and investment, variance is used to assess the risk associated with an investment.
- Variance can be used to analyze the consistency of performance metrics. It might indicate how consistent the product quality is.
- Variance analysis is crucial in scientific experiments and research. It helps assess the reliability of results and the consistency of measurements.
- In industries like manufacturing, calculating variance can be part of quality control processes.
- Variance can be used to compare different datasets or groups.
- Variance analysis can play a role in forecasting future outcomes by considering historical variability.
Where expr is an expression
MySQL Version: 8.0
Example: MySQL VARIANCE() function
The following MySQL statement returns the population standard variance of 'total_cost' from purchase table.
Sample table: purchase
SELECT VARIANCE(total_cost) FROM purchase;
mysql> SELECT VARIANCE(total_cost) -> FROM purchase; +----------------------+ | VARIANCE(total_cost) | +----------------------+ | 99472.222222 | +----------------------+ 1 row in set (0.00 sec)
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