MySQL STD() function
MySQL STD() function returns the population standard deviation of expression. The standard deviation is a statistical measure that quantifies the amount of variation or dispersion in a dataset.
It returns NULL if no matching row is found.
This function is useful in -
- It gives you an idea of how much individual values deviate from the average.
- A higher standard deviation indicates more spread-out data, while a lower standard deviation indicates more closely grouped data.
- When analyzing data, the standard deviation helps you understand the distribution of values and identify potential outliers or anomalies.
- In finance and risk analysis, standard deviation is used to measure the volatility or risk associated with investment returns or financial instruments.
- In manufacturing or quality control processes, standard deviation helps assess the consistency of product specifications and identify variations that may require corrective actions.
- Standard deviation is used to calculate confidence intervals, which provide a range within which a population parameter is likely to fall.
- You can use standard deviation to compare the variability of different datasets and assess their similarity or difference.
Where expr is an expression.
MySQL Version : 8.0
Example: MySQL STD() function
The following MySQL statement will return the population standard deviation of 'total_cost' from 'purchase' table.
Sample table: purchase
SELECT STD(total_cost) FROM purchase;
mysql> SELECT STD(total_cost) -> FROM purchase; +-----------------+ | STD(total_cost) | +-----------------+ | 315.392172 | +-----------------+ 1 row in set (0.23 sec)
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