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SQL SELECT文の処理の流れ

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FROM,ON,JOIN:テーブル指定&結合
WHERE:レコードの絞り込み
GROUP BY:グループ化( 集計対象のキーにした列以外は取得できない)
HAVING:グループ化した後、その集計対象に条件を指定する
SELECT:取得したい列を指定する
ORDER BY :並び替え

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