.java

@Entity
@Builder
public class Employee {
  
  @Id
  @GeneratedValue
  @Column(name = "EMPLOYEE_ID")
  private Long id;
  
  @Column
  private String name;
  
  @ManyToOne // 직원 : 기업 = N : 1
  @JoinColumn(name = "COMPANY_ID") // Foreign Key
  private Company company;
}

@Entity
@Builder
public class Company {
  
  @Id
  @GeneratedValue
  @Column(name = "COMPANY_ID")
  private Long id;
  
  private String name;
}