
新建数据库

插入数据


处理表
1.
2.
3.
mysql> alter table sc add unique index SC_INDEX (sno asc,cno asc);
4.
mysql> create view stu_info as select student.sno,ssex,sc.cno,score from student join sc on student.sno=sc.sno;
5.
mysql> drop index SC_INDEX on sc;
mysql> drop index index_cno on course;



















