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重複行を抽出するSQLはできたいのですが、、、ご教
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重複行を抽出するSQLはできたいのですが、、、ご教示お願いいたします。
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```SQL
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SELECT
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*
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FROM
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table a
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WHERE
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a.category in (
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SELECT
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b.category
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FROM
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table b
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GROUP BY
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b.category
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HAVING
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COUNT(*) > 1
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)
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```
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