LOG2() function

SELECT LOG2( X )
Returns natural logarithm of X with base 2. When X is less than or equal to 0.0E0 we get NULL as output.
SELECT LOG2(7); // Output is 2.8073549220576
SELECT LOG2(0.1); // Output is -3.32192809488736
SELECT LOG2(0); // Output is NULL

Using ROUND() with LOG()

SELECT ROUND(LOG2(8),2);// Ouput is 3.00
SELECT ROUND(LOG2(-5),2); // Ouput is NULL
SELECT ROUND(LOG2(9),2); // Output is 3.17


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