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MYSQL

LOG()


Description

The LOG( ) function if called with one parameter, returns the natural logarithm of X. This function returns if X is less than or equal to 0.

The LOG( ) function if called with two parameters, returns the logarithm of X to the base B. If X is less than or equal to 0, or if B is less than or equal to 1, then NULL is returned.

This function has the form:

SELECT LOG(x), SELECT LOG(B,x)
Parameter Description
B, x Numbers

Return Value

Returns the logarithm of X to the base B. If X is less than or equal to 0, or if B is less than or equal to 1, then NULL is returned.

Examples

The following example shows the basic use of this function:

mysql> SELECT LOG(2);
-> 0.69314718055995
mysql> SELECT LOG(-2);
-> NULL
mysql> SELECT LOG(2,65536);
-> 16
mysql> SELECT LOG(10,100);
-> 2
mysql> SELECT LOG(1,100);
-> NULL


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