log2¶
This function is used to return the natural logarithm of a given value with a base of 2.
Syntax¶
log2(DOUBLE a)
Parameters¶
Parameter | Mandatory | Type | Description |
|---|---|---|---|
a | Yes | DOUBLE, BIGINT, DECIMAL, or STRING | The value can be a float, integer, or string. If the value is not of the DOUBLE type, the system will implicitly convert it to the DOUBLE type for calculation. |
Return Values¶
The return value is of the DOUBLE type.
Note
If the value of a is negative, 0, or NULL, NULL is returned.
Example Code¶
The value NULL is returned.
select log2(null);
The value NULL is returned.
select log2(0);
The value 3.1699250014423126 is returned.
select log2(9);
The value 4 is returned.
select log2(16);