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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

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

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Solution

Three tables are required to represent this given model.

Here's the step-by-step explanation:

  1. A table for entity A1: This table will contain all the attributes of entity A1.

  2. A table for entity A2: This table will contain all the attributes of entity A2.

  3. A table for the many-to-many relationship B2: In a relational database, a many-to-many relationship is typically represented by a separate table that includes foreign keys referencing the primary keys of the two entities involved in the relationship. In this case, the table for B2 would include foreign keys referencing A1 and A2.

The one-to-many relationship B1 does not require a separate table. Instead, it can be represented by including a foreign key in the table for the "many" side of the relationship (in this case, A2) that references the primary key of the "one" side of the relationship (in this case, A1).

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