Have you worked with composite indexes in databases?

A composite index in a database is an index created on multiple columns of a table simultaneously. It speeds up search and sorting based on the combination of these columns.

For example, if queries frequently involve conditions on two fields, last_name and first_name, it makes sense to create a composite index (last_name, first_name).

In Java applications, experience with composite indexes is usually related to using ORM (such as Hibernate) or writing SQL queries.

An example of creating a composite index in SQL:

CREATE INDEX idx_name ON users (last_name, first_name);

This helps the database quickly find records based on both fields, improving the performance of queries with such conditions.