T-SQL LOG10() Function

The T-SQL (Transact-SQL) LOG10() function returns the base-10 logarithm of a given number. In special cases it returns the following:

If the number is less than or equal to 0, then an error is returned.

Syntax

LOG10(number)

Parameters

number Required. Specify the number. Must be greater than 0.

Return Value

Returns the base-10 logarithm of a given number.

Example 1:

The example below shows the usage of LOG10() function.

SELECT LOG10(1);
Result: 0

SELECT LOG10(2);
Result: 0.3010299956639812

SELECT LOG10(3);
Result: 0.47712125471966244

SELECT LOG10(10);
Result: 1

SELECT LOG10(15);
Result: 1.1760912590556813

Example 2:

Consider a database table called Sample with the following records:

Data	x
Data 1	0.5
Data 2	1
Data 3	5
Data 4	10
Data 5	50

The statement given below can be used to calculate the base-10 logarithm of column x.

SELECT *, LOG10(x) AS LOG10_Value FROM Sample;

This will produce the result as shown below:

Data	x	LOG10_Value
Data 1	0.5	-0.3010299956639812
Data 2	1	0
Data 3	5	0.6989700043360189
Data 4	10	1
Data 5	50	1.6989700043360187

❮ T-SQL Functions