你当前正在访问 Microsoft Azure Global Edition 技术文档网站。 如果需要访问由世纪互联运营的 Microsoft Azure 中国技术文档网站，请访问 https://docs.azure.cn。

log()

Applies to: ✅ Microsoft Fabric ✅ Azure Data Explorer ✅ Azure Monitor ✅ Microsoft Sentinel

The natural logarithm is the base-e logarithm: the inverse of the natural exponential function (exp).

Syntax

log(number)

Learn more about syntax conventions.

Parameters

Name	Type	Required	Description
number	real	✔️	The number for which to calculate the logarithm.

Returns

• log() returns the natural logarithm of the input.
• null if the argument is negative or null or can't be converted to a real value.

Example

Run the query

print result=log(5)

Output

result
1.6094379124341003

Related content

• For common (base-10) logarithms, see log10().
• For base-2 logarithms, see log2().