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docs: adjust SVG viewBox and marker refX, fix pandas dropna explanation
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SQL/Leetcode/Basic select/1179. Reformat Department Table/Claude Sonnet 4.6 Extended/README.html

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</h2>
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<div class="mt-5 overflow-x-auto">
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<svg
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viewBox="0 0 840 960"
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viewBox="-40 -40 920 1040"
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style="max-width: 100%; height: auto"
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role="img"
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aria-label="Reformat Department Table flowchart"
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id="arr"
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markerWidth="10"
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markerHeight="10"
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refX="9"
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refX="8"
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refY="3"
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orient="auto"
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markerUnits="strokeWidth"
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id="arrG"
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markerWidth="10"
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markerHeight="10"
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refX="9"
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refX="8"
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refY="3"
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orient="auto"
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markerUnits="strokeWidth"
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id="arrB"
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markerWidth="10"
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markerHeight="10"
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refX="9"
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refX="8"
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refY="3"
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orient="auto"
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markerUnits="strokeWidth"
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id="arrV"
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markerWidth="10"
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markerHeight="10"
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refX="9"
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refX="8"
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refY="3"
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orient="auto"
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markerUnits="strokeWidth"

SQL/Leetcode/Basic select/1179. Reformat Department Table/Claude Sonnet 4.6 Extended/Reformat_Department_Table_pandas.md

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@@ -61,7 +61,7 @@ def reformat_department(department: pd.DataFrame) -> pd.DataFrame:
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columns="month",
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values="revenue",
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aggfunc="first", # 重複行なし保証のため最軽量集計
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dropna=False, # 全 id を行として保持
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dropna=False, # 全てNaNの列を保持(行の保持はreindex等で行う)
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)
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# ② 存在しない月列を NaN で補完し、カレンダー順に並べ替え
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- 売上なし月は `pivot_table` が自動で `NaN`(float64)を挿入する。整数列に `NaN` が混入すると `Int64`(nullable integer)への変換が必要な場合があるが、問題仕様上は `NaN` のままで許容。
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- `id` 列は int のまま保持される(`reset_index` 後も dtype 変化なし)。
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- `pivot_table``dropna=False` は行方向(id)の保持に関するオプションで、全値が NaN の id 行も出力に残す設定(本問では主キー保証により不要だが、防御的に指定)
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- `pivot_table``dropna=False` は列方向(すべてNaNの列)の保持に関するオプションで、全値が NaN の列も出力に残す設定です。なお、id(行)の保持は `pivot_table` ではなく、後続の `reindex` 等でインデックスを明示的に指定する必要があります
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public/SQL/Leetcode/Basic select/1179. Reformat Department Table/Claude Sonnet 4.6 Extended/README.html

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</h2>
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<div class="mt-5 overflow-x-auto">
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<svg
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viewBox="0 0 840 960"
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viewBox="-40 -40 920 1040"
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style="max-width: 100%; height: auto"
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role="img"
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aria-label="Reformat Department Table flowchart"
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id="arr"
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markerWidth="10"
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markerHeight="10"
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refX="9"
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refX="8"
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refY="3"
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orient="auto"
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markerUnits="strokeWidth"
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id="arrG"
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markerWidth="10"
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markerHeight="10"
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refX="9"
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refX="8"
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refY="3"
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orient="auto"
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markerUnits="strokeWidth"
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id="arrB"
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markerWidth="10"
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markerHeight="10"
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refX="9"
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refX="8"
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refY="3"
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orient="auto"
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markerUnits="strokeWidth"
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id="arrV"
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markerWidth="10"
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markerHeight="10"
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refX="9"
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refX="8"
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refY="3"
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orient="auto"
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markerUnits="strokeWidth"

public/index.html

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<footer>
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Generated on 2026-02-20 00:24:20 UTC
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Generated on 2026-02-20 00:40:20 UTC
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</footer>
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<script>

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