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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: