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MySQL | LOG method

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MySQL
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Numeric
schedule Mar 10, 2022
Last updated
local_offer MySQL
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MySQL's LOG(~) method returns the base-B logarithm of an input number X. If we provide an input less than or equal to 0 we will return NULL.

Parameters

1. X | number

The number to return the base-B logarithm for.

2. B | number | optional

The base logarithm to use. Default is base-$e$.

Return value

The value of base-B logarithm of X.

Examples

Basic usage

To return natural logarithm of 256:

SELECT LOG(256);
+-------------------+
| LOG(256) |
+-------------------+
| 5.545177444479562 |
+-------------------+

To return base-5 logarithm of 256:

SELECT LOG(5, 256);
+--------------------+
| LOG(5, 256) |
+--------------------+
| 3.4454124645871445 |
+--------------------+

NULL return value

To return base-4 logarithm of 0:

SELECT LOG(4, 0);
+-----------+
| LOG(4, 0) |
+-----------+
| NULL |
+-----------+
robocat
Published by Arthur Yanagisawa
Edited by 0 others
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