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Em đã dùng thử @ForeignKey chưa nhỉ? Nguồn: https://stackoverflow.com/questions/68998209/how-do-i-setup-android-room-foreign-keys-in-a-join-table-accept-zero-valuesTuy nhiên anh thấy không cần thiết phải tạo khoá ngoại đâu em ạ, nó cũng không giúp ích đc gì nhiều mà lại rắc rối
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