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10以上の文字列のORDER BYは気をつけないとダメ

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数値でソートするカラムが数値型なら問題ないですが、
文字列型の場合のソートは挙動が変わります。

数値型の場合
1,2,3,4,5,6,7,8,9,10,11
文字列型の場合
1,10,11,2,3,4,5,6,7,8,9

原因としては文字列で見てしまうので最初の文字が「1」なので「1」「10」「11」が「2」より優先されてしまいます。

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