Can You Pass DBMS Test?

Explanation
The correct answer is "Alter". The Alter command is used to modify a column in a table. It allows you to add, delete, or modify columns in an existing table. This command is commonly used in database management systems to make changes to the structure of a table without having to recreate it.

Explanation
ETL stands for Extract, Transform, Load. This process is commonly used in data integration and data warehousing. Firstly, data is extracted from various sources, such as databases or files. Then, the extracted data is transformed to meet the desired format or structure, which may include cleaning, filtering, or aggregating the data. Finally, the transformed data is loaded into the target system, such as a data warehouse or a database. This allows organizations to consolidate and analyze data from multiple sources in a unified and meaningful way.

Explanation
Informatica is indeed an ETL (Extract, Transform, Load) tool. It is widely used in the field of data integration and management. Informatica provides a comprehensive set of features and functionalities that enable users to extract data from various sources, transform it according to their business requirements, and load it into target systems. With its user-friendly interface and powerful capabilities, Informatica has become a popular choice for organizations looking to streamline their data integration processes.

Explanation
DBMS (Database Management System) helps achieve both data independence and centralized control of data. Data independence refers to the ability to make changes to the database structure without affecting the applications that use it. This allows for flexibility and easier maintenance. Centralized control of data means that the DBMS provides a centralized location for managing and controlling access to the data, ensuring data integrity and security. By achieving both data independence and centralized control of data, DBMS provides a powerful tool for managing and organizing large amounts of data efficiently.

Explanation
A foreign key is used to establish a relationship between two tables in a database. It is a column or a combination of columns in one table that references the primary key in another table. This relationship ensures data integrity and allows for the establishment of connections between related data in different tables. Therefore, the correct answer is "Foreign Key."