mysql5.0.90存储过程定义变量出错，求解

CREATEPROCEDUREp()DECLAREaINT; 错误代码：#1064-YouhaveanerrorinyourSQLsyntax;checkthemanualthatcorrespondstoyourMySQLserverversionfortherightsyntaxtousenearDECLAREaINTatline1 求解释，求正确的代码，谢谢！！！！！！！！！！！！！！！！！！！

CREATE PROCEDURE p () DECLARE a INT;
错误代码：#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DECLARE a INT' at line 1

求解释，求正确的代码，谢谢！！！！！！！！！！！！！！！！！！！！！！！！！！ MySQL

CREATE PROCEDURE p () DECLARE a INT;