SQL for Java Devs · interview question
Why do teams use indexes in a database in production code?
Multiple choiceEasychapter-8-curatedpremiumsql-for-java-devsindexes
Answer and explanation
Correct answer
C. To improve the speed of data retrieval.
Why
Indexes are primarily used to speed up the retrieval of rows by using data structures like B-trees. They allow the database to locate data without scanning each row individually, thus improving query performance.
Test yourself on SQL for Java Devs
A free test with instant, explained results. No account needed.
More SQL for Java Devs questions
- How can JDBC transactions help maintain data integrity during an e-commerce checkout process?
- What would be the effect of not closing a PreparedStatement in a Java application?
- In JDBC, how do you ensure that SQL injection is prevented when executing a query that searches for a user by email?
- Why do teams use SQL JOINs to fetch relational data in a single query in production code?
- What should a repository method mainly encapsulate?
- How can you prevent the N+1 query problem when retrieving a list of orders with their customer details?