Variable scope : Variable Scope « Procedure Function « SQL / MySQL

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SQL / MySQL » Procedure Function » Variable Scope 
Variable scope
 
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, rows affected (0.00 sec)

mysql>
mysql> delimiter ;
mysql> call myProc();
ERROR 1054 (42S22): Unknown column 'inner_variable' i'field list'
mysql> drop procedure myProc;
Query OK, rows affected (0.00 sec)

mysql>

        
Related examples in the same category
1. LOCAL, SESSION, AND GLOBAL VARIABLES IN MYSQL
2. Inner variable shadows the outter variable
3. Nested blocks
4. Using Declare statement to declare the local variable
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