log10 function

The log10 function returns the logarithmic value with base 10 for the specified expression.

Syntax:

double log10(n)

Semantics:

• n: The argument n is an expression that resolves to a number.
• return type: double.
  • Returns a NULL value in the following cases:
    • n resolves to a NULL value
    • n does not resolve to a number
  • Returns NaN in the following cases:
    • n resolves to NaN
    • n is less than zero
  • Returns positive infinity if n resolves to positive infinity.
  • Returns negative infinity if n is positive/negative zero.
  • Returns n if the value of n is equal to 10ⁿ, where n is an integer.

Example:

SELECT log10(n) FROM PHtable

Value of n	Output
1	0.0
10	1.0
1.0E-7	-7.0