You can't specify target table '' for update in FROM clause
剛開始這樣寫，然後報了一個 [Err] 1093 - You can’t specify target table ‘’ for update in FROM clause 這個錯誤的原因是：更新這個表的同時又查詢了這個表，查詢這個表的同時又去更新這個表的同時查詢這樣會造成死鎖 試了半天，終於成功了
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