Tutorials References Menu

SQL Tutorial

SQL HOME SQL Intro SQL Syntax SQL Select SQL Select Distinct SQL Where SQL And, Or, Not SQL Order By SQL Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Min and Max SQL Count, Avg, Sum SQL Like SQL Wildcards SQL In SQL Between SQL Aliases SQL Joins SQL Inner Join SQL Left Join SQL Right Join SQL Full Join SQL Self Join SQL Union SQL Group By SQL Having SQL Exists SQL Any, All SQL Select Into SQL Insert Into Select SQL Case SQL Null Functions SQL Stored Procedures SQL Comments SQL Operators

SQL Database

SQL Create DB SQL Drop DB SQL Backup DB SQL Create Table SQL Drop Table SQL Alter Table SQL Constraints SQL Not Null SQL Unique SQL Primary Key SQL Foreign Key SQL Check SQL Default SQL Index SQL Auto Increment SQL Dates SQL Views SQL Injection SQL Hosting SQL Data Types

SQL References

SQL Keywords MySQL Functions SQL Server Functions MS Access Functions SQL Quick Ref

SQL Examples

SQL Examples

SQL Server LOG() Function

❮ SQL Server Functions

Example

Return the natural logarithm of 2:

SELECT LOG(2);
Try it Yourself »

Definition and Usage

The LOG() function returns the natural logarithm of a specified number, or the logarithm of the number to the specified base.

From SQL Server 2012, you can also change the base of the logarithm to another value by using the optional base parameter.

Note: Also look at the EXP() function.

Syntax

LOG(number, base) -- Syntax for SQL Server

OR:

LOG(number) -- Syntax for Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse

Parameter Values

Parameter Description
number Required. The number to return the natural logarithm of. Must be greater than 0
base Optional. The base the natural logarithm is to be calculated with. Must be greater than 1

Technical Details

Works in: SQL Server (starting with 2008), Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse

More Examples

Example

Return the natural logarithm of 2 to a specified base (4):

SELECT LOG(2, 4);
Try it Yourself »

❮ SQL Server Functions