log2

This function is used to return the natural logarithm of a given value with a base of 2.

log2(DOUBLE a)

**Table 1** Parameter
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.

The return value is of the DOUBLE type.

If the value of a is negative, 0, or NULL, NULL is returned.

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);

Parent topic: Mathematical Functions

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