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Returns the base 10 logarithm of a number.
LOG10( numeric-expression )
This function converts its argument to DOUBLE, and performs the computation in double-precision floating-point arithmetic.
If the parameter is NULL, the result is NULL.
The argument is an expression that returns the value of any built-in numeric data type.
The following statement returns the base 10 logarithm for 50.
SELECT LOG10( 50 );