CAT Exam > CAT Videos > Crash Course for CAT > Introduction to Tables - 2
Introduction to Tables - 2 Video Lecture | Crash Course for CAT
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FAQs on Introduction to Tables - 2 Video Lecture - Crash Course for CAT
| 1. What are tables used for in the context of databases? |  |
Ans. Tables in databases are used to organize and store data in a structured format. They consist of rows and columns, where each row represents a record and each column represents a specific attribute of the data.
| 2. How do you create a table in a database? | |
Ans. To create a table in a database, you need to use SQL (Structured Query Language) commands such as CREATE TABLE. This command allows you to define the table's structure by specifying the column names, data types, and any constraints.
| 3. What is the purpose of primary keys in database tables? | |
Ans. Primary keys in database tables uniquely identify each record in the table. They ensure that each row has a unique identifier, which helps in querying and managing the data efficiently. Primary keys also enforce data integrity by preventing duplicate records.
| 4. How can you add or remove columns from a table in a database? | |
Ans. To add a column to a table in a database, you can use the ALTER TABLE command with the ADD COLUMN clause. Similarly, to remove a column, you can use the ALTER TABLE command with the DROP COLUMN clause.
| 5. What is normalization and why is it important in database design? | |
Ans. Normalization is the process of organizing data in a database to reduce redundancy and dependency by dividing the data into multiple related tables. It helps in maintaining data integrity, improving data consistency, and reducing storage space.
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Nov 05, 2024 Last updated |
Video Description: Introduction to Tables - 2 for CAT 2024 is part of Crash Course for CAT preparation.
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