What is an index in a relational database, and how does it improve performance?
- Algorithm for sorting data in a table
- Data structure that provides a quick look-up of rows based on column values
- Function to calculate the average of a column
- Unique constraint on a column
An index in a relational database is a data structure that provides a quick look-up of rows based on column values, improving the speed of data retrieval. It acts as a roadmap to locate specific data efficiently.
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