diff --git a/src/main/java/doit/jpastudy2/repository/Grades.java b/src/main/java/doit/jpastudy2/repository/Grades.java
new file mode 100644
index 0000000..1efb0b9
--- /dev/null
+++ b/src/main/java/doit/jpastudy2/repository/Grades.java
@@ -0,0 +1,24 @@
+package doit.jpastudy2.repository;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import doit.jpastudy2.repository.Student;
+import java.util.List;
+
+@Entity
+@NoArgsConstructor
+@Getter
+public class Grades {
+    @Id
+    @GeneratedValue
+    private int gradeId;
+
+    private String subject;
+
+    @OneToMany(mappedBy="studentId")
+    private List<Student> students;
+
+    private String grade;
+}
diff --git a/src/main/java/doit/jpastudy2/repository/GradesRepository.java b/src/main/java/doit/jpastudy2/repository/GradesRepository.java
new file mode 100644
index 0000000..d58e2d4
--- /dev/null
+++ b/src/main/java/doit/jpastudy2/repository/GradesRepository.java
@@ -0,0 +1,8 @@
+package doit.jpastudy2.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface GradesRepository extends JpaRepository {
+
+    Grades findAllBySubject(String subject);
+}
diff --git a/src/main/java/doit/jpastudy2/repository/Student.java b/src/main/java/doit/jpastudy2/repository/Student.java
new file mode 100644
index 0000000..2340867
--- /dev/null
+++ b/src/main/java/doit/jpastudy2/repository/Student.java
@@ -0,0 +1,25 @@
+package doit.jpastudy2.repository;
+
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.Date;
+
+@Entity
+@NoArgsConstructor
+@Getter
+public class Student {
+    @Id
+    private int studentId;
+    private String studentName;
+    private Date DateOfBirth;
+
+    public Student(int studentId, String studentName, Date dateOfBirth) {
+        this.studentId = studentId;
+        this.studentName = studentName;
+        this.DateOfBirth = dateOfBirth;
+    }
+}
diff --git a/src/main/java/doit/jpastudy2/repository/StudentRepository.java b/src/main/java/doit/jpastudy2/repository/StudentRepository.java
new file mode 100644
index 0000000..432d4de
--- /dev/null
+++ b/src/main/java/doit/jpastudy2/repository/StudentRepository.java
@@ -0,0 +1,9 @@
+package doit.jpastudy2.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import doit.jpastudy2.repository.Student;
+
+public interface StudentRepository extends JpaRepository<Student, Long> {
+
+    Student findByStudentId(String studentId);
+}