???? 1.创建存储过程时候制定的类型不可以是varchar,不然会报:[Err] 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 ')
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create procedure query_sal(v_job varchar)
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???2.调用存储过程时，如果类型不一致，会报各种错误：
?????1)创建存储过程时候指定了错误的类型是不会报错的,如下指定类型为float
create procedure query_sal(v_job float)
???????? 调用时 call query_sal('salesman') 报错：
?????????????? [SQL] call query_sal('salesman')?? [Err] 1265 - Data truncated for column 'v_job' at row 342
???? 2)指定类型为char，而调用类型为数字格式时：
????????[SQL] call query_sal(12)?? [Err] 1406 - Data too long for column 'v_job' at row 342