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## Euler function

The `e` function returns the value of Euler number `e`, that is, `2.718281828459045`.

Syntax:

    double e()

Semantics:

- The `e` function does not expect any input arguments.
- return type: double.

Example 12-80 Euler function

    SELECT e() AS EULER FROM Archery

Output:

     +-----------+-------------------+
     | EULER     | 2.718281828459045 |
     +-----------+-------------------+