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Rephrasing the question: Are this two code snippets different in any way?
CREATE OR REPLACE PROCEDURE
ASSIGN_EMAIL(E_NO INT, F_NAME VARCHAR2, L_NAME VARCHAR2)
CREATE OR REPLACE PROCEDURE
ASSIGN_EMAIL(E_NO IN INT, F_NAME IN VARCHAR2, L_NAME IN VARCHAR2)
Yes,
INis the default. Check table 8.1 in the Oracle PL/SQL subprogram docs.