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@padawan_e15(Takumi Sato)

INSERT ... ON DUPLICATE KEY UPDATE 構文なのに、カラムが増える

Posted at

結論

  • auto-increment と相性が悪いため、必要なければ設定しない。

原因

  • MySQL は INSERT 時点で、auto-increment が走り、その差分が次の処理(UPDATE)へ受け継がれてしまう。← ??
  • auto-increment が必要ないならば、そのカラムを削除する。

参考

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