Purpose
LOG() returns the logarithm of y to base x.
Syntax
LOG(x,y)
Parameters
| Parameter | Description |
|---|---|
| x | The base. It can be of any numeric data type such as NUMBER, FLOAT, BINARY_FLOAT, or BINARY_DOUBLE. x must be greater than 0 and not equal to 1. |
| y | A natural number. It can be of any numeric data type such as NUMBER, FLOAT, BINARY_FLOAT, or BINARY_DOUBLE. y must be greater than 0. |
Return type
When any argument is of the BINARY_FLOAT or BINARY_DOUBLE data type, the return type is BINARY_DOUBLE. Otherwise, the return type is NUMBER.
Examples
The following example returns the logarithm of 8 to base 2.
obclient> SELECT LOG(2,8) FROM DUAL;
+----------+
| LOG(2,8) |
+----------+
| 3 |
+----------+
1 row in set
