如果我们对该过程具有ALTER ROUTINE特权，那么借助ALTER PROCEDURE 语句，我们可以更改MySQL存储过程。为了说明这一点，我们以一个名为“ delete_studentinfo”的存储过程为例，该存储过程具有以下创建语句：
mysql> SHOW CREATE PROCEDURE Delete_studentinfo\G *************************** 1. row *************************** Procedure: Delete_studentinfo sql_mode: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION Create Procedure: CREATE DEFINER=`root`@`localhost` PROCEDURE `Delete_studentinfo`( IN p_id INT) BEGIN DELETE FROM student_info WHERE ID=p_id; END character_set_client: cp850 collation_connection: cp850_general_ci Database Collation: latin1_swedish_ci 1 row in set (0.01 sec)
在上面的结果集中，很明显在存储过程'delete_studentinfo'中没有注释。现在，借助ALTER PROCEDURE语句，我们可以添加如下注释：
mysql> ALTER PROCEDURE Delete_studentinfo -> COMMENT 'deleting the record'//
现在，可以确认，借助以下查询的结果集，注释已添加到存储过程中：
mysql> SHOW CREATE PROCEDURE Delete_studentinfo\G *************************** 1. row *************************** Procedure: Delete_studentinfo sql_mode: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION Create Procedure: CREATE DEFINER=`root`@`localhost` PROCEDURE `Delete_studen tinfo`( IN p_id INT) COMMENT 'deleting the record' BEGIN DELETE FROM student_info WHERE ID=p_id; END character_set_client: cp850 collation_connection: cp850_general_ci Database Collation: latin1_swedish_ci 1 row in set (0.00 sec)