--創建數據表Admin的SQL語句：create table admin _tbl(				id number(20) not null,				name varchar(32) default null,				password varchar(32) default null,				primary key(id));--創建數據表student 的SQL 語句create table student_tbl(				id number(20) not null,				 name varchar(32) default null,				password varchar(32) default null,				jiguan varchar(32) default null,				department varchar(32) default null,				sex varchar(32) default null,				mark number(20) not null,				phone varchar(32) default null,				email varchar(32) default null,				primary key(id));--創建teacher 表的SQL語句		  create table teacher_table(			id number(20) not null,			name varchar(32) default null,			password varchar(32) default null,			title varchar(32) default null			primary key(id));		--創建course 表的SQL 語句		create table course_tbl(		id number(20) not null,		name varchar(32) default null,		mark number(20) not null,		prepare varchar（32）default null,		dep varchar(32) default null,		primary key(id));--創建classes的SQL語句		create table_tbl(			id number(20) not null,			tea_id number(20) references teacher_table(id),			cour_id number(20) references course_tbl(id),			room_id varchar(32) default null,			cour_time varchar(32) default null,			primary key(id));	  -- 創建數據表enrol的SQL語句		create table enrol_tbl(			class_id number(20) references classes_tbl(id),			stu_id number(20) references student_tbl(id),			accept varchar(32) default null,			score varchar(32) default null,			primary key(class_id,stu_id));	--為了方便后面的開發，在這里先向數據庫admin表插入三條記錄		insert into admin_tbl(1,”briup”,”briup”）;		insert into admin_tbl(2,”admin”,”admin”）;		insert into admin_tbl(3,”jia”，”jia”）;