exp function

The exp function returns the exponential value of the given expression, that is, e raised to the power of the specified expression. Here, e is the base of the natural logarithm and has the value 2.718281828459045.

Syntax:

double exp(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 if n resolves to NaN.
  • Returns positive infinity if n resolves to positive infinity.
  • Returns positive zero if n resolves to negative infinity.

Example 12-81 exp function

SELECT exp(n) FROM PHtable

Value of n	Output
0	1.0
2	7.38905609893065
-2	0.1353352832366127