SQL Server LOG() Function
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 |
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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 |
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More Examples
Example
Return the natural logarithm of 2 to a specified base (4):
SELECT LOG(2, 4);
Try it Yourself »