SSC CGL Exam > SSC CGL Videos > Computer Awareness and Proficiency > Database Concepts and Types of Keys
Database Concepts and Types of Keys Video Lecture | Computer Awareness and Proficiency - SSC CGL
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FAQs on Database Concepts and Types of Keys Video Lecture - Computer Awareness and Proficiency - SSC CGL
| 1. What are the different types of keys in a database? |  |
Ans. In a database, there are several types of keys such as primary key, foreign key, candidate key, super key, and composite key.
| 2. What is the primary key in a database? | |
Ans. The primary key is a unique identifier for each record in a database table. It ensures that each row in the table is uniquely identified and helps maintain the integrity of the data.
| 3. How is a foreign key different from a primary key? | |
Ans. A foreign key is a field in a database table that is used to establish a relationship with another table. It is not necessarily unique, unlike a primary key. The foreign key helps maintain referential integrity between the tables.
| 4. What is a composite key in a database? | |
Ans. A composite key is a combination of two or more columns in a table that together uniquely identify each record. It is used when a single column cannot uniquely identify a record, so a combination of columns is used as the key.
| 5. How does a super key differ from a candidate key? | |
Ans. A super key is a set of one or more columns that can uniquely identify each record in a table, while a candidate key is a minimal super key - the smallest set of columns that can uniquely identify each record. In other words, a candidate key is a super key without any unnecessary columns.
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Nov 22, 2024 Last updated |
Video Description: Database Concepts and Types of Keys for SSC CGL 2024 is part of Computer Awareness and Proficiency preparation.
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