create table student (student_id int not null, student_name varchar(25), student_affiliation int, student_password varchar(20), student_email varchar(30), student_phone varchar(12), student_address varchar(50));
create table instructor (instructor_id int not null, instructor_name varchar(25), instructor_affiliation int, instructor_password varchar(20), instructor_email varchar(30), instructor_phone varchar(12), instructor_address varchar(50));
create table course (course_id int not null, course_name varchar(25), course_sections int, course_description varchar(50));
create table class (course_id int not null, class_section int not null, class_strength int, class_date date, class_time time);
create table student_class (course_id int not null, class_section int, student_id int not null);
create table instructor_class (course_id int not null, class_section int, instructor_id int not null);
insert into student (student_id, student_name) Values (1, 'Marge Trechle');
insert into student (student_id, student_name) Values (2, 'Todd Relve');
insert into student (student_id, student_name) Values (3, 'Beth Schavinsky');
insert into student (student_id, student_name) Values (4, 'Thomas Newburry');
insert into student (student_id, student_name) Values (5, 'Geoff Hamilton');
insert into student (student_id, student_name) Values (6, 'Cindy Crumple');
insert into student (student_id, student_name) Values (7, 'Keith Snyder');
insert into student (student_id, student_name) Values (8, 'Belinda Myers');
insert into student (student_id, student_name) Values (9, 'Hope Wilson');
insert into student (student_id, student_name) Values (10, 'Icculus McMan');
insert into student (student_id, student_name) Values (11, 'Mary Calahan');
insert into instructor (instructor_id, instructor_name) values (1, 'Norm Salvadori');
insert into instructor (instructor_id, instructor_name) values (2, 'Terry Smith');
insert into course (course_id, course_name) values (1, 'Wetlands Critters');
insert into course (course_id, course_name) values (2, 'Ocean Ecosystems');
insert into course (course_id, course_name) values (3, 'Endangered Habitats');
insert into class (course_id, class_section) values (1,1); insert into class (course_id, class_section) values (1,2); insert into class (course_id, class_section) values (2,1); insert into class (course_id, class_section) values (3,1);
The values inserted into the database can change and more entries can be inserted and in this situation I have to write the constraints according to these criteria:
1. A COURSE may consist of one or more CLASSes
2. An INSTRUCTOR may teach one or more CLASSes
3. A STUDENT may enroll in many CLASSes
4. A STUDENT can take more than one CLASS, and each CLASS contains many
STUDENTS
5. A CLASS is taught by only one INSTRUCTOR, but an INSTRUCTOR can teach
many CLASSes
6. A COURSE consists many CLASSes, while each CLASS is based on one
COURSE, so there is a one-to-many relationship between COURSE and
CLASS
7. A STUDENT may not enroll himself/herself for two CLASSes of the same
course
8. An INSTRUCTOR may not teach two CLASSes of the same COURSE
Ýf someone can help me about these stuff I will really apreciate.
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