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12. 【MySQLエラー】Incorrect column specifier for column 'カラム名'

エラー内容

Incorrect column specifier for column 'カラム名'

 

発生条件/原因/対処法

ALTER TABLE文でAUTO_INCREMENTを付与した際に発生するエラー。(他のケースもある場合は追記)

対象カラムのデータ型がintではなくdecimalであったりAUTO_INCREMENTの許容するデータ型ではない場合に発生する。

以下のようにAUTO_INCREMENT付与のタイミングでデータ型も修正すればよい。

ALTER TABLE テーブル名 MODIFY `カラム名` int(10) NOT NULL AUTO_INCREMENT;

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  12. Incorrect column specifier for column 'カラム名'
  13. BLOB/TEXT column 'description' used in key specification without a key length
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  56. SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect string value: ~

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