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Concept of Keys in DBMS - Super, Primary, Candidate, Foreign Key, etc Video Lecture | Database Management System (DBMS) - Computer Science Engineering (CSE)

FAQs on Concept of Keys in DBMS - Super, Primary, Candidate, Foreign Key, etc Video Lecture - Database Management System (DBMS) - Computer Science Engineering (CSE)

1. What is a super key in DBMS?
Ans. A super key is a set of attributes that can uniquely identify each tuple in a table. It can contain more attributes than necessary to uniquely identify a record.
2. What is the difference between primary key and candidate key in DBMS?
Ans. A primary key is a candidate key that is chosen to uniquely identify each tuple in a table. A candidate key is a set of attributes that can uniquely identify a tuple in a table.
3. How is a foreign key different from a primary key in DBMS?
Ans. A foreign key is a key that establishes a link between two tables. It is a column or a group of columns in a table that points to the primary key of another table. A primary key, on the other hand, is used to uniquely identify each tuple in a table.
4. Can a table have multiple candidate keys in DBMS?
Ans. Yes, a table can have multiple candidate keys. These are sets of attributes that can uniquely identify a tuple in a table. However, only one of these candidate keys can be selected as the primary key.
5. How are keys important in DBMS for data integrity?
Ans. Keys are crucial in DBMS for maintaining data integrity. Primary keys ensure that each tuple in a table is unique, while foreign keys establish relationships between tables. Candidate keys help in identifying tuples uniquely, while super keys provide flexibility in selecting unique identifiers.
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