LOG2
Returns the logarithm of the given argument to base 2.
Syntax
LOG2 ( number )
Arguments
number: the number to take the logarithm of.
Note
LOG2(n) is equivalent to LOG(n) / LOG(2).
Return Type
Float or double. If number is less than or equal to 0, or if base is non-positive or 1, returns NULL.
Examples
SELECT LOG2(16); **** +----------+ | LOG2(16) | +----------+ | 4 | +----------+