Standard Deviation for SQLite

Question

I\'ve searched the SQLite docs and couldn\'t find anything, but I\'ve also searched on Google and a few results appeared.

Does SQLite have any built-in Standard Devi

Answer 1

You don't state which version of standard deviation you wish to calculate but variances (standard deviation squared) for either version can be calculated using a combination of the sum() and count() aggregate functions.

select  
(count(val)*sum(val*val) - (sum(val)*sum(val)))/((count(val)-1)*(count(val))) as sample_variance,
(count(val)*sum(val*val) - (sum(val)*sum(val)))/((count(val))*(count(val))) as population_variance
from ... ;

It will still be necessary to take the square root of these to obtain the standard deviation.