Consider the entities A1 and A2 in an ER diagram have simple single-valued attributes. B1 and B2 are the relations between A1 and A2. B1 is a one-to-many and B2 is a many-to-many relationship. There are no attributes present in B1 and B2. How many tables are required to represent this given model?3254
Question
Consider the entities A1 and A2 in an ER diagram have simple single-valued attributes. B1 and B2 are the relations between A1 and A2. B1 is a one-to-many and B2 is a many-to-many relationship. There are no attributes present in B1 and B2. How many tables are required to represent this given model?3254
Solution
Three tables are required to represent this given model.
Here's the step-by-step explanation:
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One table for entity A1: This table will contain all the attributes of entity A1.
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One table for entity A2: This table will contain all the attributes of entity A2.
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One table for the many-to-many relationship B2: In a relational database, a many-to-many relationship is represented using a junction table (also known as a bridge table, join table, map table, etc.). This table will contain the foreign keys from both the A1 and A2 tables.
The one-to-many relationship B1 does not require a separate table. This relationship can be represented by including a foreign key in the "many" side of the relationship (A2) that references the "one" side (A1).
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