Question

What is the difference between function and procedure in PL/SQL ?

Answer 1

A procedure does not have a return value, whereas a function has.

Example:

CREATE OR REPLACE PROCEDURE my_proc    (p_name IN VARCHAR2 := 'John') as begin ... end  CREATE OR REPLACE FUNCTION my_func    (p_name IN VARCHAR2 := 'John') return varchar2 as begin ... end 

Notice how the function has a return clause between the parameter list and the ‘as’ keyword. This means that it is expected to have the last statement inside the body of the function read something like:

return(my_varchar2_local_variable); 

Where my_varchar2_local_variable is some varchar2 that should be returned by that function.