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STDDEV_SAMP

Aggregate function.

The STDDEV_SAMP() function returns the sample standard deviation(the square root of VAR_SAMP()) of an expression.

caution

NULL values are not counted.

Syntax

STDDEV_SAMP(<expr>)

Arguments

ArgumentsDescription
<expr>Any numerical expression

Return Type

double

Example

Create a Table and Insert Sample Data

CREATE TABLE height_data (
id INT,
person_id INT,
height FLOAT
);

INSERT INTO height_data (id, person_id, height)
VALUES (1, 1, 5.8),
(2, 2, 6.1),
(3, 3, 5.9),
(4, 4, 5.7),
(5, 5, 6.3);

Query Demo: Calculate Sample Standard Deviation of Heights

SELECT STDDEV_SAMP(height) AS height_stddev_samp
FROM height_data;

Result

| height_stddev_samp |
|--------------------|
| 0.240 |