Database Interaction with PL/SQL: Introduction to Sub-programs - More sub-programs
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How many sub-programs can we write within a single program? The answer is AS MANY AS YOU CAN. You can declare and define any number of sub-programs within a single main program. There is no limit at all. Let us consider the following example:
declare
x number := 30;
y number := 40;
procedure displaySum as
a number := 10;
b number := 20;
begin
dbms_output.put_line('Sum of numbers :' || (a+b+x+y) );
end;
procedure displayProduct as
a number := 10;
b number := 20;
begin
dbms_output.put_line('Product of numbers :' || (a*b*x*y) );
end;
procedure displayAvg as
a number := 10;
b number := 20;
begin
dbms_output.put_line('Avg of numbers :' || ((a+b+x+y)/4) );
end;
begin
displaySum;
displayProduct;
displayAvg;
end;
Even though the above program is bit lengthy, the concept is very simple. I just used three sub-programs, namely ‘displaySum’, ‘displayProduct’ and ‘displayAvg’. Each of those sub-programs has its own declarations of variables and logic. And I am calling all the sub-programs from within the main program.
There is no particular order you can call a sub-program from within the main program. You can call sub-programs in any order without regard to the order (of the sub-programs) you defined.
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