Question

In SQLite

The random() function returns a pseudo-random integer between -9223372036854775808 and +9223372036854775807.

You can get an random with maximum value n with Select random() % n ;

But that still generates negative numbers. How can I generate only positive random numbers in SQLite ?

Answer 1

Use the ABS() (absolute value) function:

SELECT ABS(RANDOM() % N)

Note that:

If X is the integer -9223372036854775808 then abs(X) throws an integer overflow error since there is no equivalent positive 64-bit two’s complement value.