-454 THE SIGNATURE PROVIDED IN THE CREATE FUNCTION STATEMENT FOR `function-name` MATCHES THE SIGNATURE OF SOME OTHER FUNCTION ALREADY EXISTING IN THE SCHEMA

Explanation
 The signature consists of the function name (function-name),
the number of parameters defined for the function, and an ordered
list of the types of the parameters (without regard to any parameters
of the types). In this case there is a function already in the schema
and the existing  function has the same signature as the function
being created.  See the SQL Reference for the details on the uniqueness
of a function.

System action
 The statement cannot be processed.

Programmer response
 Determine if the existing function already
provides the appropriate functionality. If not, change the signature
of the new function. One way to do that is to change the function
name.

SQLSTATE
 42723

-454 THE SIGNATURE PROVIDED IN THE CREATE FUNCTION STATEMENT FOR function-name MATCHES THE SIGNATURE OF SOME OTHER FUNCTION ALREADY EXISTING IN THE SCHEMA

Explanation

System action

Programmer response

SQLSTATE

-454 THE SIGNATURE PROVIDED IN THE CREATE FUNCTION STATEMENT FOR `function-name` MATCHES THE SIGNATURE OF SOME OTHER FUNCTION ALREADY EXISTING IN THE SCHEMA