A stored function is a block of code similar to a stored procedure that performs operations and returns a single value to the user. Stored functions are defined using CREATE FUNCTION syntax that specifies the function name, parameters, return type, and BEGIN-END block containing the code and optional RETURN statement. For example, a stored function called F1 is defined to return the cube of an integer parameter by multiplying the parameter by itself twice and returning the result.

1. What is a stored function? Where is it located? How can it be used? Explain
Solution
stored function :-
stored function is nothing but block of code similar to stored procedure which will perform some
operation and returns a single value to the user. stored functions are also called as user defined
functions.
Syntax :-
CREATE OR REPLACE FUNCTION FUNCTION_NAME(PARAMETER DATATYPE)
RETURN(PARAMETER/VARIABLE DATATYPE)
IS/AS
VARIABLE DECLARATION ;
BEGIN
CODE/STATEMENT ;
RETURN(PARAMETER/VARIABLE DATATYPE) ;
END;
/
Example :-
A stored function to return the cube of a given variable value :-
CREATE OR REPLACE FUNCTION F1(X INT)
RETURN INT
IS
BEGIN
RETURN X*X*X ;
END ;
/
Output :-
SELECT F1(5) FROM DUAL ; // Function Call
F1(5)
125.