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F_LN

input/output-compatibility to ib_udf

input/output-compatibility to rFunc (LN)

Entrypoint f_ln compatible with UTF-8

Inputs/Outputs

   Input      DOUBLE     floatingpoint
   Output     DOUBLE     natural logarithm (logarithm to basis e) of the input

Syntax

   TestSQL
   SELECT 0.693147180559945 AS ISCORRECT, F_LN(2) FROM RDB$DATABASE;
   SELECT NULL AS ISCORRECT, F_LN(NULL) FROM RDB$DATABASE;