Concept explainers
Given the following tables, there is a university rule
preventing a student from enrolling in a new class if there is
an unpaid fine. Please write a table-level CHECK constraint
to implement the rule. */
create table Course
(CourseID int primary key,
CourseName varchar(50),
InstructorID int,
AcademicYear int,
Semester smallint);
create table Student
(StudentID int primary key,
LastName varchar (50),
FirstName varchar (50),
Email varchar(30),
PhoneNumber varchar (20));
create table Enrollment
(CourseID int references Course(CourseID),
StudentID int references Student(StudentID),
RegisterDate date,
primary key (CourseID, StudentID));
create table Fine
(StudentID int references Student(StudentID),
IssueDate date,
Amount money,
PaidDate date
primary key (StudentID, IssueDate));
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