mysql>
mysql> delimiter $$
mysql>
mysql> CREATE PROCEDURE myProc()
-> BEGIN
-> DECLARE outer_variable VARCHAR(20);
-> BEGIN
-> DECLARE inner_variable VARCHAR(20);
-> SET inner_variable='This is my private data';
-> END;
-> SELECT inner_variable,' This statement causes an error ';
->
-> END$$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> delimiter ;
mysql> call myProc();
ERROR 1054 (42S22): Unknown column 'inner_variable' in 'field list'
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)
mysql>
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