How to Call a Function from PL/SQL With or Without Parameters : Function « Function Procedure Packages « Oracle PL/SQL Tutorial

If there are no parameters to pass, you can simply call the function without the parentheses.

To pass actual values, you can use commas as placeholders for parameters.

SQL>
SQL> CREATE OR REPLACE FUNCTION squareme(thenum number)
  2       RETURN NUMBER IS
  3  BEGIN
  4       RETURN thenum * thenum;
  5  END squareme;
  6  /

Function created.

SQL>
SQL> BEGIN
  2       DBMS_OUTPUT.PUT_LINE('9 squared is ' || squareme(9) );
  3  END;
  4  /
9 squared is 81

PL/SQL procedure successfully completed.

SQL>

27.1.Function
	27.1.1.	Functions
	27.1.2.	Describe a user-defined function
	27.1.3.	create or replace FUNCTION iifn(boolean_expression in BOOLEAN,true_number IN NUMBER,false_number IN NUMBER)
	27.1.4.	Storing PL/SQL function in the Database
	27.1.5.	Create a simple function
	27.1.6.	Creating a Function to deal with business rules
	27.1.7.	CREATE OR REPLACE a function
	27.1.8.	Calling a Function
	27.1.9.	Calling a Function for a table
	27.1.10.	Function without parameters
	27.1.11.	Exit a function
	27.1.12.	How to Call a Function from PL/SQL With or Without Parameters
	27.1.13.	Local Subprograms
	27.1.14.	Dependency Example
	27.1.15.	The FullName Function
	27.1.16.	PLW-05005: function NO_RETURN returns without value at line 21
	27.1.17.	Use function to check passwords