STD

Description

Returns the standard deviation of the selected field.

Syntax

STD(expr)

Return value

Returns a double value which is the standard deviation of the selected field.

Examples

MySQL > select * from std_test;
+------+------+
| col0 | col1 |
+------+------+
|    0 |    0 |
|    1 |    2 |
|    2 |    4 |
|    3 |    6 |
|    4 |    8 |
+------+------+

Calculate the standard deviation of col0 and col1.

MySQL > select std(col0) as std_of_col0, std(col1) as std_of_col1 from std_test;
+--------------------+--------------------+
| std_of_col0        | std_of_col1        |
+--------------------+--------------------+
| 1.4142135623730951 | 2.8284271247461903 |
+--------------------+--------------------+

keyword

STD

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