Derived Query Methods — Spring Technical Interview Questions & Answers

Writing queries just from a method name like findByEmail.

Derived Query Methods

  • Spring Data can build a query from your method name.
  • Example: findByEmail(String email) looks up by email column/field.
  • Keywords: And, Or, Between, GreaterThan, Like, OrderBy, Top/First.
  • If names get too hard, write @Query with JPQL or native SQL.
  • Wrong property name in method → startup failure.
  • Derived queries reduce simple SQL; @Query for complex cases.

Technical Interview Tip: Give findByEmail and one keyword example (GreaterThan).

Code Examples for Derived Query Methods

Derived Query Methods — working example

import java.util.List;
import jakarta.persistence.*;
import org.springframework.data.jpa.repository.JpaRepository;

@Entity
@Table(name = "users")
class User {
  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  private Long id;

  @Column(nullable = false, unique = true)
  private String email;

  private String name;

  // getters/setters omitted
}

interface UserRepository extends JpaRepository<User, Long> {
  User findByEmail(String email);
  List<User> findByNameContainingIgnoreCase(String q);
}

Derived Query Methods — @Entity maps a table; GenerationType.IDENTITY uses DB auto-increment; JpaRepository adds CRUD + derived queries.

How to Explain Derived Query Methods to an Interviewer

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What mistake do beginners make with Derived Query Methods (sb db)?

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Where do you use Derived Query Methods (sb db)?

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