{
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  "as_of": "2026-10-23",
  "item": {
    "id": "METHOD-0275",
    "kind": "METHOD",
    "title": "pandasで二つの表をキーで結合し対応漏れを調べる",
    "last_verified": "2026-10-23",
    "currentness": "VERIFIED_AS_OF",
    "revision": 1,
    "requirements": [
      "対象データへの権限",
      "接続先または入力ファイルを確認する",
      "原典と導入済みversionの対応を確認し、権限のある検証用入力・別の出力先を用意する"
    ],
    "suitable_for": "名簿や台帳の対応を照合する場面。",
    "unsuitable_for": "キーの意味が異なる表を見た目だけで結合する用途。",
    "purpose": "pandasで二つの表をキーで結合し対応漏れを調べる",
    "composition": "pandas + Python",
    "shortest_path": [
      "結合キーと期待する一対一・多対一を決める",
      "mergeのvalidateとindicatorを使って結合する",
      "片側だけのキーと重複を確認する"
    ],
    "verification": "想定外のキー重複で検査が失敗し、対応漏れを列として識別できることを確認します。",
    "coverage": [
      "data transformation"
    ],
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    "ads": "OFF",
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