ln

description

Syntax

DOUBLE ln(DOUBLE x) Returns the natural logarithm of x to base e.

LN - 图1tip

Another alias for this function is dlog1.

example

  1. mysql> select ln(1);
  2. +---------+
  3. | ln(1.0) |
  4. +---------+
  5. | 0 |
  6. +---------+
  7. mysql> select ln(e());
  8. +---------+
  9. | ln(e()) |
  10. +---------+
  11. | 1 |
  12. +---------+
  13. mysql> select ln(10);
  14. +--------------------+
  15. | ln(10.0) |
  16. +--------------------+
  17. | 2.3025850929940459 |
  18. +--------------------+

keywords

  1. LN, DLOG1