SQL Interview Question: What is a Covering Index? #sql #sqlinterviewquestionsandanswers

What is a covering index?

Options:
A. An index that contains all columns required by a query
B. An index that covers all tables in a database
C. An index used only for joins
D. An index that stores duplicate rows

✅ Answer: A. An index that contains all columns required by a query.

💡 Explanation:
A covering index includes all the columns needed to satisfy a query. Because the database can retrieve the required data directly from the index without accessing the actual table, query performance is often significantly improved.

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