IGNOU MCS 219 2026 2027 - Map the complete object class model designed for the Learning Manageme

Question

Map the complete object class model designed for the Learning Management System (LMS) in Question 3 into a 3NF-compliant Relational Database Management System (RDBMS) table schema. Clearly document the mapping patterns applied to transform object characteristics into flat relational structures. Explicitly specify your strategy for representing inheritance hierarchies (e.g., Table-Per-Class vs. Single-Table inheritance), resolving many-to-many (M:N) associations, and preserving referential integrity constraints via Primary Key (PK) and Foreign Key (FK) mechanics.

30 Jul 2026

Answer :

Word Count : 560

The object class model of a Learning Management System (LMS) can be mapped into a 3NF-compliant relational database by converting each persistent class into a table, object attributes into columns, and associations into primary and foreign key relationships. The mapping must eliminate repeating groups, partial dependencies, and transitive dependencies while preserving the relationships identified in the object-oriented model. The major LMS classes can be represented through tables such as USER, STUDENT, INSTRUCTOR, COURSE, MODULE, ASSIGNMENT, ENROLLMENT, SUBMISSION, and GRADE. The USER table contains UserID as the primary key along with attributes such as Name, Email, PasswordHash, and UserType. If Student and Instructor are specializations of User, their tables contain UserID as both the primary key and foreign key referencing USER(UserID). STUDENT may contain Student-specific attributes, while INSTRUCTOR contains Instructor-specific attributes. This represents inheritance using the Table-Per-Subclass strategy, which is appropriate when different subclasses have substantially different attributes. It avoids large numbers of NULL values and maintains normalization. An alternative is Single-Table inheritance, where all users and subtype attributes are stored in one table with a discriminator column, but the subclass approach provides better structural separation for the LMS. The COURSE table contains CourseID as the primary key, together with CourseName, Description, Credits, and InstructorID as a foreign key referencing INSTRUCTOR(UserID). If a course

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