MySQL UNION / UNIION ALL/ EXCEPT

Có 1 query để UNION ALL mà ko biết bỏ chữ ALL đi cứ đi tìm EXCEPT để bỏ row trùng.
MySQL ko có (chạy đc) lệnh EXCEPT.
Đơn giản vậy nhưng thi thoảng vẫn óc chó vkl. :)

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