Common Spring Boot Questions asked : How does Spring Boot auto-configuration work? Explain the lifecycle of a Spring Bean. What is the difference between @RestController and @Controller? How to configure a database in Spring Boot? What is Spring Data JPA and how does it simplify database operations? How does the Spring Boot actuator work? ✅ Common SQL Questions: Write a query to fetch the second-highest salary. Difference between INNER JOIN, LEFT JOIN, and RIGHT JOIN. How to optimize an SQL query? What is an index, and how does it work? . .