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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 Deviation function?
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To calculate the sample standard deviation, you use the STDDEV_SAMP (expression) function. MySQL also provides some functions for population variance and sample variance calculation: VAR_POP(expression) – calculates the population standard variance of the expression.
The theoretical maximum number of rows in a table is 264 (18446744073709551616 or about 1.8e+19). This limit is unreachable since the maximum database size of 281 terabytes will be reached first.
You can calculate the variance in SQL:
create table t (row int); insert into t values (1),(2),(3); SELECT AVG((t.row - sub.a) * (t.row - sub.a)) as var from t, (SELECT AVG(row) AS a FROM t) AS sub; 0.666666666666667 However, you still have to calculate the square root to get the standard deviation.
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