diff --git a/src/main/kotlin/com/lanyuanxiaoyao/bookstore/Entity.kt b/src/main/kotlin/com/lanyuanxiaoyao/bookstore/Entity.kt
index c8f1f97..628bd2d 100644
--- a/src/main/kotlin/com/lanyuanxiaoyao/bookstore/Entity.kt
+++ b/src/main/kotlin/com/lanyuanxiaoyao/bookstore/Entity.kt
@@ -3,6 +3,7 @@
 package com.lanyuanxiaoyao.bookstore
 
 import jakarta.persistence.CascadeType
+import jakarta.persistence.CollectionTable
 import jakarta.persistence.Column
 import jakarta.persistence.ConstraintMode
 import jakarta.persistence.ElementCollection
@@ -41,6 +42,7 @@ class Book(
     var description: String,
     var source: String?,
     @ElementCollection(fetch = FetchType.EAGER)
+    @CollectionTable(foreignKey = ForeignKey(ConstraintMode.NO_CONSTRAINT))
     var tags: MutableSet<String> = mutableSetOf(),
     @OneToMany(cascade = [CascadeType.ALL], fetch = FetchType.LAZY, mappedBy = "book")
     var chapters: MutableSet<Chapter> = mutableSetOf(),