What is normalization. What is subquery. What is performance optimization

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Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity. Subquery is a query nested within another query. Performance optimization involves improving the efficiency of a system.

Normalization involves breaking down data into smaller, manageable parts to avoid redundancy. For example, a database table can be split into multiple tables to store related data separately.
A subquery is a query nested within another query. It is used to retrieve data that will be used by the main query. For example, finding the average salary of employees in a department using a subquery within a main query.
Performance optimization involves improving the efficiency of a system by reducing resource usage and improving response times. Techniques include indexing, query optimization, and caching.

What is normalization. What is subquery. What is performance optimization

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