LOG10() function
SELECT LOG10( X )
Returns natural logarithm of X with base 10. When X is less than or equal to 0.0E0 we get NULL as output.
SELECT LOG10(3); // Output is 0.477121254719662
SELECT LOG10(0.1); // Output is -1
SELECT LOG10(0); // Output is NULL
Using ROUND() with LOG()
SELECT ROUND(LOG10(2),2);// Ouput is 0.30
SELECT ROUND(LOG10(-2),2); // Ouput is NULL
SELECT ROUND(LOG10(7),2); // Output is 0.85
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