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STD
Aggregate function. Calculates the population standard deviation value from a set of numbers. STD has synonyms STDDEV and STDDEV_POP which are equivalent.
Syntax
STD returns NULL if there are not matching rows.
STD ( expression )
Arguments
- expression: any expression. This may be a column name, the result of another function, or a math operation.
Return Type
A double.
Examples
select std(table_rows) from information_schema.tables;
+-----------------+
| std(table_rows) |
+-----------------+
| 2.1500 |
+-----------------+
1 row in set (2.87 sec)
