Re: factorial of negative numbers

... oh, one slightly more important nit-pick: per the catalogs and
code, the function is factorial(bigint):

   Schema   |   Name    | Result data type | Argument data types | Type 
------------+-----------+------------------+---------------------+------
 pg_catalog | factorial | numeric          | bigint              | func

but you have it documented as factorial(numeric).

            regards, tom lane