回答編集履歴
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クエリおよび動作サンプルを追記
test
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@@ -5,3 +5,53 @@
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except あたりを使って、(A)から(B)を取り除くと、求めている結果になりそうです。
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```sql
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select
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Filename
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,Alias
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from
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Test
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group by
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Filename
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,Alias
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except
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select
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Filename
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,Alias
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from
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Test
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where
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Columnname='del_flg'
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group by
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Filename
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,Alias
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;
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```
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[動作するサンプル@sqlfiddle](http://sqlfiddle.com/#!17/68cb2/4)
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