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Consider the following example.
Example:
A University name BITS has maintained the two relations to store the information about the faculty table and Teaches table. The faculty table stores the faculty_id (faculty_id has the unique id of faculty in the whole university) and faculty_name. The Teaches table stores the Course_id, Course_Name, and faculty_id. So the university admin department prints the faculty_name and Course_Name.
How many primary keys are there at the BITS University?
- a)0
- b)1
- c)2
- d)3
Correct answer is option 'C'. Can you explain this answer?
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Consider the following example.Example:A University name BITS has main...
Concept:
Attribute:
Attribute:
- An attribute is a characteristic. In a database management system (DBMS), an attribute refers to a database component, such as a table.
- It also may refer to a database field. Attributes describe the instances in the column of a database.
Candidate Key:
A relation can have one or more attributes that take distinct values. Any of these attributes can be used to uniquely identify the tuples in the relation. Such attributes are called candidate keys as each of them are candidates for the primary key.
Primary Key:
Out of one or more candidate keys, the attribute chosen by the database designer to uniquely identify the tuples in a relation is called the primary key of that relation.
Explanation:
From the given data we had two tables which are faculty and Teach.
faculty (faculty_id, faculty_name )
Here faculty_id and faculty_name are attributes.
Here faculty_id is the unique id of faculty in the whole university So it is the primary key in the faculty table.
From the given data we had two tables which are faculty and Teach.
faculty (faculty_id, faculty_name )
Here faculty_id and faculty_name are attributes.
Here faculty_id is the unique id of faculty in the whole university So it is the primary key in the faculty table.
Example:
Teaches (Course_id, Course_Name, faculty_id )
- Course_id, Course_Name, and faculty_id are attributes.
- Here Course_id is the unique id of the course in the whole university So it is the primary key in the teaches table.
- Here faculty_id is not unique so not be the primary key, candidate key, and super key because a faculty member may teach more than one subject.
Unique attributes are maintaining the BITS University has faculty_id, faculty_name, Course_id, and Course_Name. Hence it has four unique attributes.
Example:
Hence there are two primary keys which are faculty_id and Course_id.
Hence the correct answer is B.
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Consider the following example.Example:A University name BITS has main...
Primary Keys at BITS University
To determine the number of primary keys at BITS University, let's analyze the given information and the structure of the two tables: faculty and Teaches.
Faculty Table
The faculty table stores the faculty_id and faculty_name information. Here, the faculty_id is mentioned as the unique id of faculty in the whole university.
Teaches Table
The Teaches table stores the Course_id, Course_Name, and faculty_id. It means that each row in the Teaches table is associated with a specific faculty member who teaches a particular course.
Understanding Primary Keys
A primary key is a unique identifier for each record in a database table. It ensures that each row in the table can be uniquely identified. In this case, the primary key is used to uniquely identify faculty members and courses.
Analysis
From the given information, we can deduce the following:
- The faculty_id in the faculty table is mentioned as the unique id of faculty in the whole university. This indicates that faculty_id is a primary key in the faculty table.
- In the Teaches table, the faculty_id is used to associate each row with a specific faculty member. Since faculty_id is also a primary key in the faculty table, it can be considered as a foreign key in the Teaches table, linking the two tables together.
- The Course_id in the Teaches table is used to identify each course. It is not explicitly mentioned whether Course_id is unique or not. However, for the purpose of this analysis, let's assume that Course_id is unique for each course.
Conclusion
Based on the above analysis, the primary keys at BITS University are as follows:
1. faculty_id in the faculty table is a primary key.
2. faculty_id in the Teaches table is a foreign key, referencing the primary key in the faculty table.
3. Course_id in the Teaches table can be considered as a primary key, assuming it is unique for each course.
Hence, there are a total of three primary keys at BITS University.
To determine the number of primary keys at BITS University, let's analyze the given information and the structure of the two tables: faculty and Teaches.
Faculty Table
The faculty table stores the faculty_id and faculty_name information. Here, the faculty_id is mentioned as the unique id of faculty in the whole university.
Teaches Table
The Teaches table stores the Course_id, Course_Name, and faculty_id. It means that each row in the Teaches table is associated with a specific faculty member who teaches a particular course.
Understanding Primary Keys
A primary key is a unique identifier for each record in a database table. It ensures that each row in the table can be uniquely identified. In this case, the primary key is used to uniquely identify faculty members and courses.
Analysis
From the given information, we can deduce the following:
- The faculty_id in the faculty table is mentioned as the unique id of faculty in the whole university. This indicates that faculty_id is a primary key in the faculty table.
- In the Teaches table, the faculty_id is used to associate each row with a specific faculty member. Since faculty_id is also a primary key in the faculty table, it can be considered as a foreign key in the Teaches table, linking the two tables together.
- The Course_id in the Teaches table is used to identify each course. It is not explicitly mentioned whether Course_id is unique or not. However, for the purpose of this analysis, let's assume that Course_id is unique for each course.
Conclusion
Based on the above analysis, the primary keys at BITS University are as follows:
1. faculty_id in the faculty table is a primary key.
2. faculty_id in the Teaches table is a foreign key, referencing the primary key in the faculty table.
3. Course_id in the Teaches table can be considered as a primary key, assuming it is unique for each course.
Hence, there are a total of three primary keys at BITS University.
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Consider the following example.Example:A University name BITS has maintained the two relations to store the information about the faculty table and Teaches table. The faculty table stores the faculty_id (faculty_id has the unique id of faculty in the whole university) and faculty_name. The Teaches table stores the Course_id, Course_Name, and faculty_id. So the university admin department prints the faculty_name and Course_Name.How many primary keys are there at the BITS University?a)0b)1c)2d)3Correct answer is option 'C'. Can you explain this answer?
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Consider the following example.Example:A University name BITS has maintained the two relations to store the information about the faculty table and Teaches table. The faculty table stores the faculty_id (faculty_id has the unique id of faculty in the whole university) and faculty_name. The Teaches table stores the Course_id, Course_Name, and faculty_id. So the university admin department prints the faculty_name and Course_Name.How many primary keys are there at the BITS University?a)0b)1c)2d)3Correct answer is option 'C'. Can you explain this answer? for Humanities/Arts 2024 is part of Humanities/Arts preparation. The Question and answers have been prepared according to the Humanities/Arts exam syllabus. Information about Consider the following example.Example:A University name BITS has maintained the two relations to store the information about the faculty table and Teaches table. The faculty table stores the faculty_id (faculty_id has the unique id of faculty in the whole university) and faculty_name. The Teaches table stores the Course_id, Course_Name, and faculty_id. So the university admin department prints the faculty_name and Course_Name.How many primary keys are there at the BITS University?a)0b)1c)2d)3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Humanities/Arts 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following example.Example:A University name BITS has maintained the two relations to store the information about the faculty table and Teaches table. The faculty table stores the faculty_id (faculty_id has the unique id of faculty in the whole university) and faculty_name. The Teaches table stores the Course_id, Course_Name, and faculty_id. So the university admin department prints the faculty_name and Course_Name.How many primary keys are there at the BITS University?a)0b)1c)2d)3Correct answer is option 'C'. Can you explain this answer?.
Consider the following example.Example:A University name BITS has maintained the two relations to store the information about the faculty table and Teaches table. The faculty table stores the faculty_id (faculty_id has the unique id of faculty in the whole university) and faculty_name. The Teaches table stores the Course_id, Course_Name, and faculty_id. So the university admin department prints the faculty_name and Course_Name.How many primary keys are there at the BITS University?a)0b)1c)2d)3Correct answer is option 'C'. Can you explain this answer? for Humanities/Arts 2024 is part of Humanities/Arts preparation. The Question and answers have been prepared according to the Humanities/Arts exam syllabus. Information about Consider the following example.Example:A University name BITS has maintained the two relations to store the information about the faculty table and Teaches table. The faculty table stores the faculty_id (faculty_id has the unique id of faculty in the whole university) and faculty_name. The Teaches table stores the Course_id, Course_Name, and faculty_id. So the university admin department prints the faculty_name and Course_Name.How many primary keys are there at the BITS University?a)0b)1c)2d)3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Humanities/Arts 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following example.Example:A University name BITS has maintained the two relations to store the information about the faculty table and Teaches table. The faculty table stores the faculty_id (faculty_id has the unique id of faculty in the whole university) and faculty_name. The Teaches table stores the Course_id, Course_Name, and faculty_id. So the university admin department prints the faculty_name and Course_Name.How many primary keys are there at the BITS University?a)0b)1c)2d)3Correct answer is option 'C'. Can you explain this answer?.
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