回答編集履歴
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質問修正に対して追記
test
CHANGED
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@@ -13,3 +13,61 @@
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希望する出力結果にする場合、
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group by の項目から「QTY」を外すと良いと思います。
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（↑上記は質問文修正前の回答）
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質問文修正後、追加
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---
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```SQL
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-- これはアリ？
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SELECT V1.ITEM_ID
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, SUM( V1.sum_item_qty )
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, MAX( V1.sum_parent_qty )
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FROM (
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SELECT T1.ITEM_ID
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, SUM(T1.QTY) as sum_item_qty
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, SUM(T1.QTY) OVER (PARTITION BY PARENT_NO) as sum_parent_qty
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FROM TABLE_A T1
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GROUP BY
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T1.ITEM_ID
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, T1.QTY
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, T1.PARENT_NO
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) V1
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GROUP BY V1.ITEM_ID
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-- ↓これでもOK?エラーかもですが。
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SELECT T1.ITEM_ID
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, SUM(T1.QTY) as sum_item_qty
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, MAX( SUM(T1.QTY) OVER (PARTITION BY PARENT_NO) ) as sum_parent_qty
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FROM TABLE_A T1
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GROUP BY T1.ITEM_ID
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```
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