SQL Reference

LOG2(X)

x: This parameter represents the numeric expression to calculate the binary logarithm of. It takes a positive number to perform the LOG2 operation. If the value of X is NULL, the function returns NULL. If the value of X is less than or equal to zero, an error will occur.

Example

SELECT LOG2(8) AS Log_Base_2;

Output

+-------------+
| Log_Base_2  |
+-------------+
|      3      |
+-------------+

Explanation

The LOG2 function in MySQL is used to calculate the base 2 logarithm of a number. In the above example, LOG2(8) returns ‘3’ because the base-2 logarithm of 8 is 3.

double precision LOG2(double precision x)

x: The double precision floating-point number for which the base 2 logarithm is calculated. The function accepts a positive, non-zero value.

Example

SELECT LOG2(8);

Output

Explanation

The LOG2() function in PostgreSQL returns the base 2 logarithm of a number. In the given example, LOG2(8) returns 3 because 2 raised to the power of 3 is 8.

LOG2( float_expression )

float_expression: This parameter represents the positive number for which the binary logarithm is to be computed. It accepts floating-point numbers and the function LOG2 calculates the base-2 logarithm for it.

Example

SELECT LOG2(100) AS Log_Value;

Output

Log_Value
6.643856189774724

Explanation

The LOG2 function has computed the base 2 logarithm of the number provided, 100 in this case. The resultant value, approximately 6.644, means that 2 raised to this power equals 100.

LOG2(n NUMBER) RETURN NUMBER;

n: This is the numeric value for which the base-2 logarithm will be computed. It must be a positive number. If the input is less than or equal to zero, the function will return an error.

Example

SELECT LOG(2,16) AS Log_Value FROM dual;

Output

LOG_VALUE
---------
4

Explanation

The example demonstrates the usage of the LOG function in Oracle SQL. The LOG function calculates the logarithm of a number with a specific base. In this case, the number is 16 and the base is 2. The LOG function is shown to return the value 4, indicating that 2 to the fourth power equals 16.