31 Jul modelling
Using the given table/relation, do the following:
1. Draw a dependency diagram to show the functional dependencies in the relation
2. Decompose the following table into a set of 3NF relations
3. Draw a relational schema for your 3NF relations and show the referential integrity constraints. Manually drawing the dependency diagrams is not acceptable.
| Trainer_ID | Trainer_Name | Room_No | Room_Seats | Class_Session | Class_Name | Class_Day | School |
| 101 | Alana Fredrick | 54A | 36 | 9:00 | ITC114 | Mon | Computing |
| 102 | George Edwards | 22 | 28 | 9:00 | ITC333 | Mon | Computing |
| 103 | Lilly Nelly | 59 | 38 | 12:30 | BUS350 | Tues | Business |
| 104 | Eddy Brown | 53 | 30 | 12:30 | ITC114 | Thurs | Computing |
| 102 | George Edwards | 59 | 38 | 4:00 | ITC504 | Fri | Computing |
| 103 | Lilly Nelly | 18 | 24 | 12:30 | BUS360 | Wedn | Business |
| 102 | George Edwards | 53 | 30 | 9:00 | ITC201 | Wedn | Computing |
| 105 | Sam Wang | 22 | 28 | 4:00 | ITC556 | Tues | Computing |
| 106 | Yifeng Chong | 58 | 38 | 9:00 | ITC556 | Thurs | Computing |
Rationale
This assessment item is designed to test your understanding of the normalisation process based on existing data in order to minimise redundancies and data anomalies.
Marking criteria
The marking criteria for this assignment are:
| Task | HD | DI | CR | PS | FL |
| Decompose relation into 3NF and show relational schema for each relation and referential integrity constraints | All relations in 3NF and all partial and transitive dependencies removed, each relation shows correct referential integrity constraints | All relations in 3NF and all partial and transitive dependencies removed, each relation shows referential integrity constraints | All relations in 3NF and all partial and transitive dependencies removed, most relations show referential integrity constraints | All relations in 3NF and all partial and transitive dependencies removed, some relations show referential integrity constraints | Incomplete decomposition or relations not in 3NF, no relations show integrity constraints |
| Create an ERD & show all entities, PK & KF attributes, relationships, cardinality & optionality | Comprehensive and accurate ERD that contains all entities, PK and FK attributes, associative entities included if required, all relationships shown and identified with correct cardinality and optionality | Detailed and accurate ERD that contains all entities, PK and FK attributes, associative entities included if required, all relationships shown and identified with correct cardinality | Thorough & reasonably accurate ERD that contains all entities, PK and FK attributes, associative entities included if required, all relationships shown with correct cardinality | Adequate ERD that contains most entities, PK and FK attributes, associative entities included if required, all relationships shown with cardinality | Incomplete or irrelevant ERD that contains some entities, relationships, and cardinality |
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