GATE DA 2026 Set 1 — Question 61
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Database Management & Warehousing → ER to Relational Mapping → Conversion Rules & Techniques
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Question
Consider an ER model with the entities and , where, are the attributes of , and are the attributes of . Let be a multi-valued attribute. and are the primary keys of and , respectively.Let be a many-to-many relationship between and . Participation of both and in is total.The minimum number of relations required to convert the ER model into relational model (assuming there is no other functional dependency) where each relation is in third normal form (3NF) is __________ . (Answer in integer)
Correct answer
4 to 4
Solution
To convert the given ER model into a relational model in 3NF, we need the following relations:
1.Entity : One relation is needed for the entity with attributes , where is the primary key.
2.Entity : Since is a multi-valued attribute, it cannot be part of the main relation for in 3NF. Thus, we need:
- A relation for the single-valued attributes of : , where is the primary key.
- A separate relation for the multi-valued attribute : , where the combination forms the primary key.
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