Question: StdID is a primary key in the Students table StdID is a foreign key in the Enrolment table and references to StdID from the Students

StdID is a primary key in the Students table
StdID is a foreign key in the Enrolment table and references to StdID from the Students table.
lctID is a primary key in the Lecturer table
lctID is a foreign key in the Course table and references to lctID from the lecturer table
courseID is a primary key in the Course table
courseID is a foreign key in the Enrolment table and references to courseID from the Course table
EnrolmentID is a primary key in the Enrolment table

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