Mixed Name and Position Notation Calls : Parameters « Function Procedure Packages « Oracle PL/SQL Tutorial

SQL> CREATE OR REPLACE FUNCTION add_three_numbers( a NUMBER := 0, b NUMBER := 0, c NUMBER := 0 ) RETURN NUMBER IS
  2  BEGIN
  3    RETURN a + b + c;
  4  END;
  5  /

Function created.

27.14.Parameters
	27.14.1.	Defining Formal Parameters
	27.14.2.	There are three types of formal parameters in subprograms: IN, OUT, and IN OUT.
	27.14.3.	Define function with NUMBER type parameter
	27.14.4.	Function without parameter
	27.14.5.	Use IF/ELSIF/ELSE to verify the input parameter
	27.14.6.	Use ROWTYPE as the parameter
	27.14.7.	Passing parameters to procedures
	27.14.8.	Using Named Notation
	27.14.9.	Use mixed notation to avoid the second parameter, but keep the first and third
	27.14.10.	Parameter Modes
	27.14.11.	Positional Notation
	27.14.12.	Positional vs. named parameter passing.
	27.14.13.	Parameter Default Values
	27.14.14.	Specifying procedure or function parameters Positional notation
	27.14.15.	Table collection type parameter
	27.14.16.	Mixed Name and Position Notation Calls