STDDEV: population standard deviation
MySQL aggregate function STDDEV() returns population standard deviation of the input field. It returns NULL if no matching row is found.
STDDEV() is synonym of the sql function STDDEV_POP().
STD() is also synonym of the sql function STDDEV_POP().
Here are some examples using our student table.
SELECT STDDEV(mark) , STD(mark), STDDEV_POP(mark) FROM `student`
Output is here
| STDDEV(mark) | STD(mark) | STDDEV_POP(mark) |
|---|
| 16.49766163752223 | 16.49766163752223 | 16.49766163752223 |
By using FORMAT()
Restrict decimal places by using FORMAT()
SELECT FORMAT(STDDEV(mark),2) FROM `student`
Output is here
| FORMAT(STDDEV(mark),2) |
|---|
| 16.50 |
This article is written by plus2net.com team.
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