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Updated on 2023-10-25 GMT+08:00
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ln

This function is used to return the natural logarithm of a given value.

Syntax

ln(DOUBLE a)

Parameters

Table 1 Parameter

Parameter

Mandatory

Type

Description

a

Yes

DOUBLE, BIGINT, DECIMAL, or STRING

The value can be a float, integer, or string.

If the value is not of the DOUBLE type, the system will implicitly convert it to the DOUBLE type for calculation.

Return Values

The return value is of the DOUBLE type.

  • If the value of a is negative or 0, NULL is returned.
  • If the value of a is NULL, NULL is returned.

Example Code

The value 1.144729868791239 is returned.

select ln(3.1415926);

The value 1 is returned.

select ln(2.718281828459045);

The value NULL is returned.

select ln(null);
Parent topic: Mathematical Functions