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Two statements are given below, one is Assertion (A) and the other is Reason (R). Read the statements carefully and choose the correct answer.
Assertion (A): In a relational database, a primary key is a unique identifier for each record in a table.
Reason (R): A primary key can be a combination of two columns.
Reason (R): A primary key can be a combination of two columns.
- a)Both A and R are correct, and R is the correct explanation of A.
- b)Both A and R are correct, but R is not the correct explanation of A.
- c)A is correct, but R is not correct.
- d)A is not correct, but R is correct.
Correct answer is option 'B'. Can you explain this answer?
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Two statements are given below, one is Assertion (A) and the other is ...
In a relational database, a primary key is a unique identifier for each record in a table. A primary key cannot be null, and it must have a unique value for each record in the table. The primary key is used to identify each record in the table and to ensure data integrity by preventing duplicate records from being inserted into the table. Therefore, the reason does not correctly explain the assertion.
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Two statements are given below, one is Assertion (A) and the other is ...
Assertion (A): In a relational database, a primary key is a unique identifier for each record in a table.
Reason (R): A primary key can be a combination of two columns.
The correct answer is option 'B': Both A and R are correct, but R is not the correct explanation of A.
Explanation:
A primary key is a fundamental concept in relational databases. It is a unique identifier that is used to uniquely identify each record in a table. Let's break down the given statements and explain them in detail:
Assertion (A): In a relational database, a primary key is a unique identifier for each record in a table.
- This statement is correct. In a relational database, a primary key is a column or a set of columns that uniquely identifies each record (row) in a table. It ensures the uniqueness and integrity of the data in the table. No two records in a table can have the same primary key value.
Reason (R): A primary key can be a combination of two columns.
- This statement is also correct. A primary key can indeed be a combination of two or more columns. This is known as a composite primary key. It allows for more flexibility in uniquely identifying records when a single column may not be sufficient. For example, in a table that stores employee data, a composite primary key could be a combination of the employee's ID and the department ID. This ensures that each employee belongs to a unique department and eliminates any ambiguity.
Explanation of the Correct Answer:
The correct answer is option 'B': Both A and R are correct, but R is not the correct explanation of A.
- Both the assertion and reason are correct statements on their own. A primary key is indeed a unique identifier for each record in a table, and it can be a combination of columns. However, the reason provided does not explain why the assertion is correct. It simply adds an additional piece of information about the possibility of using a composite primary key. The reason does not provide an explanation for the uniqueness and identification of each record, which is the main purpose of a primary key.
Therefore, option 'B' is the correct answer, as it acknowledges the correctness of both the assertion and reason while stating that the reason does not fully explain the assertion.
Reason (R): A primary key can be a combination of two columns.
The correct answer is option 'B': Both A and R are correct, but R is not the correct explanation of A.
Explanation:
A primary key is a fundamental concept in relational databases. It is a unique identifier that is used to uniquely identify each record in a table. Let's break down the given statements and explain them in detail:
Assertion (A): In a relational database, a primary key is a unique identifier for each record in a table.
- This statement is correct. In a relational database, a primary key is a column or a set of columns that uniquely identifies each record (row) in a table. It ensures the uniqueness and integrity of the data in the table. No two records in a table can have the same primary key value.
Reason (R): A primary key can be a combination of two columns.
- This statement is also correct. A primary key can indeed be a combination of two or more columns. This is known as a composite primary key. It allows for more flexibility in uniquely identifying records when a single column may not be sufficient. For example, in a table that stores employee data, a composite primary key could be a combination of the employee's ID and the department ID. This ensures that each employee belongs to a unique department and eliminates any ambiguity.
Explanation of the Correct Answer:
The correct answer is option 'B': Both A and R are correct, but R is not the correct explanation of A.
- Both the assertion and reason are correct statements on their own. A primary key is indeed a unique identifier for each record in a table, and it can be a combination of columns. However, the reason provided does not explain why the assertion is correct. It simply adds an additional piece of information about the possibility of using a composite primary key. The reason does not provide an explanation for the uniqueness and identification of each record, which is the main purpose of a primary key.
Therefore, option 'B' is the correct answer, as it acknowledges the correctness of both the assertion and reason while stating that the reason does not fully explain the assertion.
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Two statements are given below, one is Assertion (A) and the other is Reason (R). Read the statements carefully and choose the correct answer.Assertion (A): In a relational database, a primary key is a unique identifier for each record in a table.Reason (R): A primary key can be a combination of two columns.a)Both A and R are correct, and R is the correct explanation of A.b)Both A and R are correct, but R is not the correct explanation of A.c)A is correct, but R is not correct.d)A is not correct, but R is correct.Correct answer is option 'B'. Can you explain this answer?
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