Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Videos > Database Management System (DBMS) > Concept of Keys in DBMS - Super, Primary, Candidate, Foreign Key, etc
Concept of Keys in DBMS - Super, Primary, Candidate, Foreign Key, etc Video Lecture | Database Management System (DBMS) - Computer Science Engineering (CSE)
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62 videos|66 docs|35 tests
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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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Dec 23, 2024 Last updated |
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