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SELECT句でつけた別名をORDER BYでは使えてGROUP BYでは使えない理由

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SELECT文の内部的な実行順序

FROM → WHERE → GROUP BY → HAVING → SELECT → ORDER BY

上の実行順序が重要になる。
SELECT句を実行するまでは、別名は付けられていないので、当然WHEREやGROUP BYで別名を使うことはできない。

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