Answer / nitin

With the use of forward declaration we can call other package

Answer / subha

First compile package A and B spec then compile package body of both A and B.

Answer / ss

i know sql so here A and B are two tables which both having Primary and foreign Key so from A's PK is referring in to B and B's PK referring in to  A 
OR select * from A inner join B on (A.id=B.AID)

Answer / nitin

Forward declaration can be implemented for procedure only.In one package you can create inter-dependency but for package it is not possible.

Answer / anil

I assume this question as:
") I have 2 programs  A and B. Now program A references Program  B and Program B references Program A. How do you compile such inter-dependent objects in PL/SQL"

ANS:We can compile mutually referencing programmes using FORWARD declaration(specifying the declaration of one program in beginning of package body) inside a PACKAGE.
Example:
CREATE OR REPLACE PACKAGE test_pack
IS
gvar NUMBER:=0;
--PROCEDURE p1; --we can also achieve like this
END;
/

CREATE OR REPLACE PACKAGE BODY test_pack
IS
PROCEDURE p1; --forward declaration

PROCEDURE p2 
IS
BEGIN
P1;
END;

PROCEDURE p1
IS
BEGIN
p2;
END;

END;

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