Calling a User-Defined Built-In Function

This is the generalized syntax for calling a user-defined built-in function.
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This is the generalized syntax for calling a user-defined built-in function.
Syntax
                                  ┌───── , ─────┐ ►►─── 
invocation-name
 ────── ( ─▼─ parameter ─┴─ ) ───────────────────────────►◄  
Parameters
  • invocation-name
    Specifies the invocation name for the user-defined function.
  • parameter
    Specifies the parameters for the user-defined function.
    Optional parameters that are not included must be replaced by the character @, unless no included parameters follow the omitted parameter.