Understanding Composite Indexes in SQL
Quick Answer
A composite index in SQL is an index on multiple columns of a table. It helps speed up queries that filter or sort on those columns together by allowing the database to quickly locate rows matching combined criteria.
Learning Objectives
- Define what a composite index is in SQL.
- Explain how composite indexes improve query performance.
- Identify when to use composite indexes versus single-column indexes.
Introduction
Indexes are vital for improving database query performance by allowing faster data retrieval.
A composite index is a special type of index that includes more than one column, enabling efficient queries on multiple fields simultaneously.
An index is like a roadmap for your database queries.





