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Introduction to Tables -1 Video Lecture | Crash Course for CAT
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FAQs on Introduction to Tables -1 Video Lecture - Crash Course for CAT
| 1. What is a table in the context of databases? |  |
Ans. A table in the context of databases is a structured collection of data organized in rows and columns. It is used to store related information, and each row represents a unique record, while each column represents a specific attribute or field of that record.
| 2. How are tables created in databases? | |
Ans. Tables are created in databases using a structured query language (SQL). The CREATE TABLE statement is used to define the table's structure, including the column names, data types, and any constraints or rules that need to be applied to the data.
| 3. What is the purpose of primary keys in database tables? | |
Ans. Primary keys in database tables serve as unique identifiers for each record in the table. They ensure that each row has a unique identity by preventing duplicate values. Primary keys are important for data integrity, efficient searching, and establishing relationships between tables.
| 4. Can tables in a database have relationships with each other? | |
Ans. Yes, tables in a database can have relationships with each other. Relationships are established by using primary keys and foreign keys. A foreign key in one table refers to the primary key in another table, creating a link between the two tables. This allows for data consistency and the ability to retrieve related information.
| 5. How can data be retrieved from a table in a database? | |
Ans. Data can be retrieved from a table in a database using SQL queries. The SELECT statement is commonly used to retrieve data from one or more tables based on specified criteria. The result of the query is a set of rows that match the conditions specified in the query.
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Nov 23, 2024 Last updated |
Video Description: Introduction to Tables -1 for CAT 2024 is part of Crash Course for CAT preparation.
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