diff --git a/src/main/java/com/example/demo/repository/SubCategoryRepository.java b/src/main/java/com/example/demo/repository/SubCategoryRepository.java
new file mode 100644
index 0000000..7a2ea13
--- /dev/null
+++ b/src/main/java/com/example/demo/repository/SubCategoryRepository.java
@@ -0,0 +1,12 @@
+package com.example.demo.repository;
+import java.util.List;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.example.demo.entity.BookSubcategory;
+
+public interface SubCategoryRepository
+        extends JpaRepository<BookSubcategory,Integer> {
+	List<BookSubcategory> findByBookCategory_BookCategoryId(Integer bookCategoryId);
+
+}
\ No newline at end of file