摘要:
01.use ClassDB 02.drop table enrol /*引用student 和classes*/ 03.drop table student/*被enrol引用*/ 04.drop table admin/*未被引用*/ 05.drop table classes/*引用course和teacher同时被classes引用*/ 06.drop table course/*被classes引用*/ 07.drop table teacher/*被classes引用*/ 08./*创建课程表*/ 09.create table course( 10.id int... 阅读全文