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What is the min and max number of tables required to convert an ER diagram with 2 entities and 1 relationship between them with partial participation constraints of both entities?
- a)Min 1 and max 2
- b)Min 1 and max 3
- c)Min 2 and max 3
- d)Min 2 and max 2
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
What is the min and max number of tables required to convert an ER dia...
Maximum number of tables required is 3 in case of many to many relationships between entities. Minimum number of tables is 1 in case of unary relationship and total participation of atleast one entity. But in case of partial participation of both entities, minimum number of tables required is 2.
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What is the min and max number of tables required to convert an ER dia...
Explanation:
To determine the minimum and maximum number of tables required to convert an ER diagram with 2 entities and 1 relationship between them, we need to consider the partial participation constraints of both entities.
Entities and Relationship:
Let's assume the two entities are A and B, and the relationship between them is R.
Partial Participation Constraints:
Partial participation constraints indicate that not all entities in a relationship are required to participate. In this case, both entities A and B have partial participation constraints.
Minimum Number of Tables:
To find the minimum number of tables, we need to consider the partial participation constraints and create separate tables for each entity and relationship.
1. Table for Entity A: Since entity A has a partial participation constraint, it can exist without any relationship. Therefore, a separate table is required for entity A.
2. Table for Entity B: Similar to entity A, entity B also has a partial participation constraint and requires a separate table.
3. Table for Relationship R: The relationship between entities A and B requires a separate table to represent the relationship.
Therefore, the minimum number of tables required is 3.
Maximum Number of Tables:
To find the maximum number of tables, we need to consider the possibility of merging the tables based on the partial participation constraints.
1. Table for Entity A: Entity A has a partial participation constraint and can exist without any relationship.
2. Table for Entity B: Entity B also has a partial participation constraint and can exist without any relationship.
3. Table for Relationship R: The relationship between entities A and B requires a separate table to represent the relationship.
However, since both entities have partial participation constraints, it is possible to merge the tables for entities A and B into a single table. This means that the maximum number of tables required is 2.
Therefore, the correct answer is option C: Min 2 and max 3.
To determine the minimum and maximum number of tables required to convert an ER diagram with 2 entities and 1 relationship between them, we need to consider the partial participation constraints of both entities.
Entities and Relationship:
Let's assume the two entities are A and B, and the relationship between them is R.
Partial Participation Constraints:
Partial participation constraints indicate that not all entities in a relationship are required to participate. In this case, both entities A and B have partial participation constraints.
Minimum Number of Tables:
To find the minimum number of tables, we need to consider the partial participation constraints and create separate tables for each entity and relationship.
1. Table for Entity A: Since entity A has a partial participation constraint, it can exist without any relationship. Therefore, a separate table is required for entity A.
2. Table for Entity B: Similar to entity A, entity B also has a partial participation constraint and requires a separate table.
3. Table for Relationship R: The relationship between entities A and B requires a separate table to represent the relationship.
Therefore, the minimum number of tables required is 3.
Maximum Number of Tables:
To find the maximum number of tables, we need to consider the possibility of merging the tables based on the partial participation constraints.
1. Table for Entity A: Entity A has a partial participation constraint and can exist without any relationship.
2. Table for Entity B: Entity B also has a partial participation constraint and can exist without any relationship.
3. Table for Relationship R: The relationship between entities A and B requires a separate table to represent the relationship.
However, since both entities have partial participation constraints, it is possible to merge the tables for entities A and B into a single table. This means that the maximum number of tables required is 2.
Therefore, the correct answer is option C: Min 2 and max 3.
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What is the min and max number of tables required to convert an ER dia...
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What is the min and max number of tables required to convert an ER diagram with 2 entities and 1 relationship between them with partial participation constraints of both entities?a)Min 1 and max 2b)Min 1 and max 3c)Min 2 and max 3d)Min 2 and max 2Correct answer is option 'C'. Can you explain this answer?
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