建表：
mysql> create table sch(
-> id int primary key,
-> name varchar(50) not null,
-> glass varchar(50) not null
-> );
Query OK, 0 rows affected (0.01 sec)
插入数据：
mysql> insert into sch (id,name,glass) values (1,'zhizhuo','glass 1');
Query OK, 1 row affected (0.00 sec)
mysql> insert into sch (id,name,glass) values (2,'haodong','glass 2');
Query OK, 1 row affected (0.00 sec)
1、创建一个可以统计表格内记录条数的存储函数 ，函数名为count_sch()
mysql> set global log_bin_trust_function_creators = 1; #关闭binlog日志
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> \d @
mysql> create function count_sch()
-> returns int
-> begin
-> declare c int default 0;
-> select count(*) into c from sch;
-> return c;
-> end@
Query OK, 0 rows affected (0.02 sec)
mysql> select count_sch()@
2、创建一个存储过程avg_sai，有3个参数，分别是deptno，job，接收平均工资，功能查询emp表dept为30，job为销售员的平均工资
mysql> \d //
mysql> create procedure avg_sal(in deptno int, in job varchar(50),out s double)
-> begin
-> select avg(salary) into s from employees where department_id=deptno and job_id=job;
-> select s;
-> end //
Query OK, 0 rows affected (0.00 sec)
mysql> call avg_sal (90,'AD_VP',@s)//
