This script demonstrates variable visibility

    
SQL>
SQL>
SQL> SET SERVEROUTPUT ON
SQL>
SQL> DECLARE
  2     visibleValue VARCHAR2(30);
  3     hiddenValue VARCHAR2(30);
  4  BEGIN
  5     visibleValue := 'visible';
  6     hiddenValue := 'hidden';
  7
  8     DBMS_OUTPUT.PUT_LINE('OUTER BLOCK');
  9     DBMS_OUTPUT.PUT_LINE(visibleValue);
 10     DBMS_OUTPUT.PUT_LINE(hiddenValue);
 11
 12     DECLARE
 13        hiddenValue NUMBER(10);
 14     BEGIN
 15        DBMS_OUTPUT.PUT_LINE('INNER BLOCK');
 16        hiddenValue := 'inner hiddenValue';
 17        DBMS_OUTPUT.PUT_LINE(hiddenValue);
 18     EXCEPTION
 19        WHEN OTHERS
 20        THEN
 21           DBMS_OUTPUT.PUT_LINE('hiddenValue of type VARCHAR2 was...hidden');
 22     END;
 23  END;
 24  /
OUTER BLOCK
visible
hidden
INNER BLOCK
hiddenValue of type VARCHAR2 was...hidden

PL/SQL procedure successfully completed.

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This script demonstrates variable visibility : While Loop « PL SQL « Oracle PL / SQL

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