Important
Self-managed SingleStore will soon transition from version 9.1 RC to version 10. This new semantic versioning scheme will provide SingleStore with finer control over engine and feature releases that were not possible with the current versioning scheme.
In the interim, SingleStore 9.1 RC can be used to preview, evaluate, and provide feedback on the new and upcoming features in SingleStore 10 prior to its general availability. Ahead of this transition, SingleStore 9.0 is recommended for production workloads, which can later be upgraded to SingleStore 10.
LOG
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The LOG() function returns the logarithm of the given argument, optionally in the specified base.
If only one argument is given, this function returns the natural logarithm to base e.
Syntax
LOG ( base, number )LOG ( number )
Arguments
-
base: Base of the logarithm. -
number: Number to take the logarithm of.
Note
LOG(n) is an alias for LN(n).
LOG(b, n) is equivalent to LN(n) / LN(b).
Return Type
Float or double.NULL.
Examples
SELECT LOG(2, 16);
+------------+
| LOG(2, 16) |
+------------+
| 4 |
+------------+SELECT LOG(2, 1234);
+-------------------+
| LOG(2, 1234) |
+-------------------+
| 10.26912667914942 |
+-------------------+SELECT LOG(1234);
+--------------------+
| LOG(1234) |
+--------------------+
| 7.1180162044653335 |
+--------------------+SELECT LN(1234);
+--------------------+
| LN(1234) |
+--------------------+
| 7.1180162044653335 |
+--------------------+SELECT LOG(10, 1000), LN(1000) / LN(10);
+--------------------+--------------------+
| LOG(10, 1000) | LN(1000) / LN(10) |
+--------------------+--------------------+
| 2.9999999999999996 | 2.9999999999999996 |
+--------------------+--------------------+SELECT LOG(-9);
+---------+
| LOG(-9) |
+---------+
| NULL |
+---------+Last modified: