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MySQL | STDDEV_SAMP method
schedule Aug 10, 2023
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Tags MySQL
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MySQL's STDDEV_SAMP(~) aggregate method returns the sample standard deviation from the provided numeric input.
Parameters
1. expr | numeric
The numeric input to return the sample standard deviation for.
Return value
The sample standard deviation for the provided numeric input.
Examples
Consider the following table about some students:
student_id | fname | lname | day_enrolled | age | username |
|---|---|---|---|---|---|
1 | Sky | Towner | 2015-12-03 | 17 | stowner1 |
2 | Ben | Davis | 2016-04-20 | 19 | bdavis2 |
3 | Travis | Apple | 2018-08-14 | 18 | tapple3 |
4 | Arthur | David | 2016-04-01 | 16 | adavid4 |
5 | Benjamin | Town | 2014-01-01 | 17 | btown5 |
The above sample table can be created using the code here.
Basic usage
To return the sample standard deviation of students' age:
SELECT STDDEV_SAMP(age) AS "Sample Standard Deviation Age"FROM students;
+-------------------------------+| Sample Standard Deviation Age |+-------------------------------+| 1.1401754250991378 |+-------------------------------+
Published by Arthur Yanagisawa
Edited by 0 others
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Official MySQL Documentation
https://dev.mysql.com/doc/refman/8.0/en/group-by-functions.html#function_stddev-samp
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