LOG
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Returns the logarithm of the given argument in the given base.
If only one argument is given, this function returns the natural
logarithm to base e.
Syntax
LOG ( base, number )LOG ( number )
Arguments
-
base: the base of the logarithm.
-
number: the 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.
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: April 4, 2023