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## 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