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SQL> set serveroutput on
SQL> CREATE or replace PROCEDURE my_first_proc IS
2 greetings VARCHAR2(20);
3 BEGIN
4 greetings := 'Hello World';
5 dbms_output.put_line(greetings);
6 END my_first_proc;
7 /
SQL>
SQL> EXECUTE my_first_proc;
Hello World
PL/SQL procedure successfully completed.
SQL>
SQL> BEGIN
2 my_first_proc;
3 END;
4 /
Hello World
PL/SQL procedure successfully completed.
SQL>
SQL>
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