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@Katsu8998(Katsu 8998)

UNION ALLとORDER BYの組み合わせ

Posted at

最後のUNION ALLのselect文にorder byがある場合

UNION ALL後にすべてを結合した次にorder byによりソートが実施される。

それぞれのUNION ALLにorder byがある場合

それぞれのUNION ALL内でソートされた後に結合が行われる

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