On this page

Categories: Math

# LOG

Returns the logarithm of the numeric input expression. If no base is specified, the natural log (ln) will be calculated.

## Syntax

### LOG(base_expression float, expression float) → double

• base_expression: The base to use.
• expression: The value for which you want to calculate the log.

Examples

``````SELECT LOG(20.5, 1.5)
-- 0.1342410830900514
``````

### LOG(base_expression double, expression double) → double

• base_expression: The base to use.
• expression: The value for which you want to calculate the log.

Examples

``````SELECT LOG(20.5, 1.5)
-- 0.1342410830900514
``````

### LOG(expression int64) → double

• expression: The value for which you want to calculate the log.

Examples

``````SELECT LOG(10)
-- 2.302585092994046
``````

### LOG(base_expression int64, expression int64) → double

• base_expression: The base to use.
• expression: The value for which you want to calculate the log.

Examples

``````SELECT LOG(10, 2)
-- 0.30102999566398114
``````

### LOG(expression int32) → double

• expression: The value for which you want to calculate the log.

Examples

``````SELECT LOG(10)
-- 2.302585092994046
``````

### LOG(base_expression int32, expression int32) → double

• base_expression: The base to use.
• expression: The value for which you want to calculate the log.

Examples

``````SELECT LOG(10, 2)
-- 0.30102999566398114
``````

### LOG(expression float) → double

• expression: The value for which you want to calculate the log.

Examples

``````SELECT LOG(12.5)
-- 2.5257286443082556
``````

### LOG(expression double) → double

• expression: The value for which you want to calculate the log.

Examples

``````SELECT LOG(12.5)
-- 2.5257286443082556
``````

## Usage Notes

If base_expression is 1. If base_expression expression is less than 0, NaN will be returned. If the expression input is 0, `-Infinity` is returned. If the expression input is less than 0, NaN will be returned.