WHILE Loop: This condition will evaluate to NULL, since v_Counter is initialized to NULL by default

    

SQL>
SQL> CREATE TABLE MyTable (
  2    num_col    NUMBER,
  3    char_col   VARCHAR2(60)
  4    );

Table created.

SQL>
SQL>
SQL> DECLARE
  2    v_Counter BINARY_INTEGER;
  3  BEGIN
  4    WHILE v_Counter <= 50 LOOP
  5      INSERT INTO MyTable
  6        VALUES (v_Counter, 'Loop index');
  7      v_Counter := v_Counter + 1;
  8    END LOOP;
  9  END;
 10  /

PL/SQL procedure successfully completed.

SQL>
SQL>
SQL> select * from MyTable;

no rows selected

SQL>
SQL> drop table MyTable;

Table dropped.

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WHILE Loop: This condition will evaluate to NULL, since v_Counter is initialized to NULL by default : While Loop « PL SQL « Oracle PL / SQL

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