STDDEV、STDDEV_POP

デスクリプション

expr式の標準偏差を返します

Alias

• STDDEV_POP

Syntax

STDDEV(<expr>)

パラメータ

Parameter	デスクリプション
<expr>	標準偏差を計算する値

Return Value

expr式の標準偏差を返します

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 |
+-------------------+