STD,STDDEV,STDDEV_POP

Description

Returns the standard deviation of the expr expression

Alias

• STD
• STDDEV_POP

Syntax

STDDEV(<expr>)

Parameters

Parameter	Description
<expr>	The value to be calculated standard deviation, support all numeric type

Return Value

Return the standard deviation of the expr expression

Examples

-- Create sample tables
CREATE TABLE score_table (
    student_id INT,
    score DOUBLE
) DISTRIBUTED BY HASH(student_id)
PROPERTIES (
    "replication_num" = "1"
);

-- Insert test data
INSERT INTO score_table VALUES
(1, 85),
(2, 90),
(3, 82),
(4, 88),
(5, 95);

-- Calculate the standard deviation of all students' scores
SELECT STDDEV(score) as score_stddev
FROM score_table;

+-------------------+
| score_stddev      |
+-------------------+
| 4.427188724235729 |
+-------------------+