存储过程-输入学生的姓名，打印出学生的最高分、最低分、平均分

 1 create or replace procedure showStudentInfo(ThisStudentName varchar2)
 2 as
 3   thismax number;
 4   thismin number;
 5   thisavg number;
 6   sno number;
 7   line student%rowtype;
 8 begin
 9   select sid into sno from student where sname=ThisStudentName;  --先求学号，检测学号是否合法，不存在立即进入异常
10   select max(cmark),min(cmark),trunc(avg(cmark),2) into thismax,thismin,thisavg
11   from mark
12   where sid = sno;
13   dbms_output.put_line(ThisStudentName||‘的最高分为：‘||thismax||‘最低分为：‘||thismin||‘平均分为：‘||thisavg);
14 exception
15   when no_data_found then
16        dbms_output.put_line(ThisStudentName||‘不存在，请核对!‘);
17   when too_many_rows then
18       for line in(select*from student where sname=ThisStudentName) loop      ---取出学生表的每一行  循环取出
19         select max(cmark),min(cmark),trunc(avg(cmark),2) into thismax,thismin,thisavg 
20         from mark
21         where sid=line.sid;
22          dbms_output.put_line(line.sid||ThisStudentName||‘的最高分为：‘||thismax||‘最低分为：‘||thismin||‘平均分为：‘||thisavg);
23       end loop;
24 end;

1 -----调用---
2 set serveroutput on
3 begin 
4   showStudentInfo(‘萧瑾‘);
5 end;