| Firebird Documentation Index → Firebird 2.1 Language Ref. Update → Internal functions → LN() |
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Available in: DSQL, PSQL
Added in: 2.1
Description: Returns the natural logarithm of the argument.
Result type: DOUBLE PRECISION
Syntax:
LN (number)
An error is raised if the argument is negative or 0.
If the external function LN is declared in your database, it will override the internal function. To make the internal function available, DROP or ALTER the external function (UDF).
See also: EXP()
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| Firebird Documentation Index → Firebird 2.1 Language Ref. Update → Internal functions → LN() |