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What is a covering index?

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01

Understand the problem

Explain covering indexes.

covering-index
02

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

Nudge consolestandby

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03

Study the solution

A covering index includes all columns a query needs (in the key or as included columns), so the database answers entirely from the index without reading the table — eliminating extra lookups and speeding up the query.

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04

Run the code

SQLCovering Index Playground
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