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[SQL] [DML] 副問合せ

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SQL文 詳細
EXISTS 副問合せからの導出値があれば真、なければ偽を返す(結果の有無のみ)
SELECT * FROM A WHERE EXISTS()
NOT EXITS 副問合せからの導出値がなければ真、なければ偽を返す(結果の有無のみ)
SELECT * FROM A WHERE NOT NOT EXISTS()

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