質問編集履歴
1
データ不足
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@@ -10,19 +10,27 @@
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sale_date discout_price
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ID sale_date discout_price
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20181102 2390
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1 20181102 2390
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20181102 510
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1 20181102 510
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20171022 5280
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1 20171022 5280
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20160404 4608
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2 20160404 4608
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2 20181012 2200
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→この場合だと
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①IDは1 sale_dateは20181102 discount_priceは2390+510=2900
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②IDは2 sale_dateは20181012 discount_priceは2200
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