{"id":9137,"date":"2026-07-14T16:01:12","date_gmt":"2026-07-14T07:01:12","guid":{"rendered":"https:\/\/since2020.jp\/media\/?p=9137"},"modified":"2026-07-14T16:01:13","modified_gmt":"2026-07-14T07:01:13","slug":"duckdb-csv-data-quality-check","status":"publish","type":"post","link":"https:\/\/since2020.jp\/media\/duckdb-csv-data-quality-check\/","title":{"rendered":"DuckDB\u00d7Python\u3067CSV\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u3092\u3084\u3063\u3066\u307f\u305f\uff1a\u6b20\u640d\u30fb\u91cd\u8907\u30fb\u7570\u5e38\u5024\u3092SQL\u3067\u78ba\u8a8d\u3059\u308b"},"content":{"rendered":"\n

CSV\u30c7\u30fc\u30bf\u3092\u5206\u6790\u3084\u53ef\u8996\u5316\u306b\u4f7f\u3046\u524d\u306b\u3001\u6b20\u640d\u5024\u3084\u91cd\u8907\u3001\u7570\u5e38\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u304b\u78ba\u8a8d\u3057\u305f\u3044<\/span>\u5834\u9762\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u3082\u3061\u308d\u3093\u3001Python\u306epandas\u3060\u3051\u3067\u3082CSV\u306e\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u306f\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u6b20\u640d\u5024\u306e\u78ba\u8a8d\u3084\u91cd\u8907\u30c1\u30a7\u30c3\u30af\u306fDataFrame\u3092 df<\/code> \u3068\u3057\u305f\u5834\u5408\u3001\u6b21\u306e\u3088\u3046\u306b\u66f8\u3051\u307e\u3059\u3002<\/p>\n\n\n\n

df.isnull().sum()\ndf.duplicated(subset=["inquiry_id"]).sum()\ndf[df["response_minutes"] > 1440]<\/code><\/pre><\/div>\n\n\n\n
\u4e00\u65b9\u3067\u3001\u30c7\u30fc\u30bf\u5206\u6790\u3084\u30c7\u30fc\u30bf\u57fa\u76e4\u306e\u73fe\u5834\u3067\u306f\u3001SQL\u3067\u30c7\u30fc\u30bf\u3092\u78ba\u8a8d\u3059\u308b\u6a5f\u4f1a<\/span>\u3082\u591a\u304f\u3042\u308a\u307e\u3059\u3002DuckDB\u3092\u4f7f\u3046\u3068\u3001\u30ed\u30fc\u30ab\u30ebPC\u4e0a\u3067CSV\u3092\u8aad\u307f\u8fbc\u307f\u3001SQL\u3067\u624b\u8efd\u306b\u54c1\u8cea\u30c1\u30a7\u30c3\u30af<\/span><\/strong>\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001DuckDB\u3092\u4f7f\u3063\u3066\u3001\u554f\u3044\u5408\u308f\u305b\u30ed\u30b0\u3092\u6a21\u3057\u305f\u67b6\u7a7aCSV<\/span><\/strong>\u306e\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\n
\u3053\u306e\u8a18\u4e8b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u65b9\u3092\u60f3\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
    \n
  • CSV\u30c7\u30fc\u30bf\u3092\u4f7f\u3063\u305f\u5206\u6790\u3084\u53ef\u8996\u5316\u3092\u59cb\u3081\u305f\u3070\u304b\u308a\u306e\u65b9<\/li>\n\n\n\n
  • pandas\u3067CSV\u3092\u6271\u3063\u305f\u3053\u3068\u306f\u3042\u308b\u304c\u3001SQL\u3067\u306e\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u306b\u306f\u6163\u308c\u3066\u3044\u306a\u3044\u65b9<\/li>\n\n\n\n
  • DuckDB\u3092\u4f7f\u3063\u3066\u3001\u30ed\u30fc\u30ab\u30eb\u74b0\u5883\u3067\u624b\u8efd\u306bSQL\u3092\u8a66\u3057\u3066\u307f\u305f\u3044\u65b9<\/li>\n\n\n\n
  • \u5206\u6790\u524d\u306b\u3001\u6b20\u640d\u5024\u30fb\u91cd\u8907\u30fb\u7570\u5e38\u5024\u3092\u3069\u3046\u78ba\u8a8d\u3059\u308c\u3070\u3088\u3044\u304b\u77e5\u308a\u305f\u3044\u65b9<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n
    \u306a\u304a\u3001\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c\u554f\u984c\u30c7\u30fc\u30bf\u3092\u691c\u51fa\u3059\u308b\u3068\u3053\u308d\u300d<\/strong><\/span>\u307e\u3067\u3092\u6271\u3044\u307e\u3059\u3002\u691c\u51fa\u3057\u305f\u30c7\u30fc\u30bf\u306e\u4fee\u6b63\u3001\u30af\u30ec\u30f3\u30b8\u30f3\u30b0\u51e6\u7406\u306e\u81ea\u52d5\u5316\u3001\u672c\u756a\u904b\u7528\u306e\u8a2d\u8a08\u307e\u3067\u306f\u6271\u3044\u307e\u305b\u3093\u3002<\/p>\n\n\n\n
    DuckDB\u3068\u306f<\/h2>\n\n\n\n
    DuckDB\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u74b0\u5883\u3067\u624b\u8efd\u306bSQL\u3092\u5b9f\u884c\u3067\u304d\u308b\u5206\u6790\u5411\u3051\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u3059\u3002<\/strong><\/p>\n\n\n\n
    Python<\/span><\/strong>\u304b\u3089\u5229\u7528\u3067\u304d\u3001CSV\u3084Parquet\u306a\u3069\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u76f4\u63a5\u8aad\u307f\u8fbc\u3093\u3067SQL\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u578b\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u7528\u610f\u3057\u306a\u304f\u3066\u3082\u8a66\u305b\u308b\u305f\u3081\u3001\u624b\u5143\u306eCSV\u3092\u5c11\u3057\u78ba\u8a8d\u3057\u305f\u3044\u3068\u304d<\/strong><\/span>\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n\n\n\n
    \u4eca\u56de\u306e\u3088\u3046\u306a\u5c0f\u3055\u306a\u691c\u8a3c\u3067\u306f\u3001DuckDB\u3092\u30e1\u30e2\u30ea\u4e0a\u3067\u8d77\u52d5\u3057\u3066\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
    \u5b9f\u884c\u74b0\u5883<\/h3>\n\n\n\n
    \u7b46\u8005\u306f\u4ee5\u4e0b\u306e\u74b0\u5883\u3067\u5b9f\u884c\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
    \u9805\u76ee<\/th>\u5185\u5bb9<\/th><\/tr><\/thead>
    \u30a8\u30c7\u30a3\u30bf<\/td>Visual Studio Code<\/td><\/tr>
    OS<\/td>Windows<\/td><\/tr>
    Python\u306e\u30d0\u30fc\u30b8\u30e7\u30f3<\/td>Python 3.14.6<\/td><\/tr>
    \u4eee\u60f3\u74b0\u5883<\/td>.venv<\/code><\/td><\/tr>
    \u4f7f\u7528\u30e9\u30a4\u30d6\u30e9\u30ea<\/td>duckdb, pandas<\/td><\/tr>
    DuckDB\u306e\u30d0\u30fc\u30b8\u30e7\u30f3<\/td>1.5.4<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \u30e9\u30a4\u30d6\u30e9\u30ea\u306f\u3001\u4eee\u60f3\u74b0\u5883\u5185\u3067\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
    PowerShell<\/p>\n\n\n\n
    python -m pip install duckdb pandas<\/code><\/pre><\/div>\n\n\n\n
    \u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u5f8c\u3001\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3067DuckDB\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
    PowerShell<\/p>\n\n\n\n
    python -c "import duckdb; print(duckdb.__version__)"<\/code><\/pre><\/div>\n\n\n\n
    ModuleNotFoundError: No module named 'duckdb'<\/code> \u304c\u8868\u793a\u3055\u308c\u308b\u5834\u5408\u306f\u3001VS Code\u3067\u9078\u629e\u3057\u3066\u3044\u308bPython\u74b0\u5883\u306b duckdb<\/code> \u304c\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3066\u3044\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    \u305d\u306e\u5834\u5408\u306f\u3001VS Code\u53f3\u4e0b\u306ePython\u74b0\u5883\u8868\u793a\u3092\u78ba\u8a8d\u3057\u3001\u4f5c\u6210\u3057\u305f\u4eee\u60f3\u74b0\u5883 .venv<\/code> \u304c\u9078\u629e\u3055\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
    \u30b3\u30fc\u30c9\u306e\u5b9f\u884c\u65b9\u6cd5<\/h3>\n\n\n\n
    \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001duckdb_csv_quality_check.py<\/code> \u3068\u3044\u3046Python\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u3001\u4ee5\u964d\u306e\u30b3\u30fc\u30c9\u3092\u4e0a\u304b\u3089\u9806\u756a\u306b\u66f8\u3044\u3066\u5b9f\u884c\u3059\u308b<\/span><\/strong>\u60f3\u5b9a\u3067\u9032\u3081\u307e\u3059\u3002<\/p>\n\n\n\n
    \u4f5c\u696d\u30d5\u30a9\u30eb\u30c0\u306e\u4f8b\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n\n\n\n
    duckdb_csv_quality_check\/\n\u251c\u2500\u2500 duckdb_csv_quality_check.py<\/code><\/pre><\/div>\n\n\n\n
    duckdb_csv_quality_check.py<\/code> \u3092\u4fdd\u5b58\u3057\u305f\u3089\u3001\u30bf\u30fc\u30df\u30ca\u30eb\u3067\u305d\u306e\u30d5\u30a1\u30a4\u30eb\u304c\u3042\u308b\u30d5\u30a9\u30eb\u30c0\u306b\u79fb\u52d5\u3057\u3001\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3067\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
    PowerShell<\/p>\n\n\n\n
    python duckdb_csv_quality_check.py<\/code><\/pre><\/div>\n\n\n\n
    \u3053\u306e\u3042\u3068\u4f5c\u6210\u3059\u308b inquiry_logs.csv<\/code> \u3084 inquiry_logs.parquet<\/code> \u306f\u3001\u57fa\u672c\u7684\u306b\u3053\u306ePython\u30d5\u30a1\u30a4\u30eb\u3068\u540c\u3058\u30d5\u30a9\u30eb\u30c0\u306b\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
    \u4eca\u56de\u4f5c\u6210\u3059\u308b\u67b6\u7a7aCSV<\/h3>\n\n\n\n
    \u4eca\u56de\u306f\u3001\u554f\u3044\u5408\u308f\u305b\u30ed\u30b0\u3092\u30a4\u30e1\u30fc\u30b8\u3057\u305f\u67b6\u7a7aCSV\u3092\u4f5c\u6210<\/strong><\/span>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
    \u5217\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
    \u5217\u540d<\/th>\u5185\u5bb9<\/th><\/tr><\/thead>
    inquiry_id<\/td>\u554f\u3044\u5408\u308f\u305bID<\/td><\/tr>
    created_at<\/td>\u554f\u3044\u5408\u308f\u305b\u65e5\u6642<\/td><\/tr>
    category<\/td>\u554f\u3044\u5408\u308f\u305b\u30ab\u30c6\u30b4\u30ea<\/td><\/tr>
    priority<\/td>\u512a\u5148\u5ea6<\/td><\/tr>
    status<\/td>\u5bfe\u5fdc\u72b6\u6cc1<\/td><\/tr>
    channel<\/td>\u554f\u3044\u5408\u308f\u305b\u7d4c\u8def<\/td><\/tr>
    response_minutes<\/td>\u521d\u56de\u5fdc\u7b54\u307e\u3067\u306e\u6642\u9593<\/td><\/tr>
    resolution_minutes<\/td>\u89e3\u6c7a\u307e\u3067\u306e\u6642\u9593<\/td><\/tr>
    rating<\/td>\u8a55\u4fa1<\/td><\/tr>
    comment<\/td>\u30b3\u30e1\u30f3\u30c8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u306e\u52d5\u304d\u3092\u78ba\u8a8d\u3057\u3084\u3059\u304f\u3059\u308b\u305f\u3081\u306b\u3001\u3042\u3048\u3066\u4ee5\u4e0b\u306e\u554f\u984c\u30c7\u30fc\u30bf<\/span><\/strong>\u3082\u6df7\u305c\u307e\u3059\u3002<\/p>\n\n\n\n
    \u554f\u984c\u30c7\u30fc\u30bf<\/th>\u78ba\u8a8d\u76ee\u7684<\/th><\/tr><\/thead>
    category\u304c\u7a7a\u306e\u884c<\/td>\u6b20\u640d\u5024\u30c1\u30a7\u30c3\u30af<\/td><\/tr>
    rating\u304c\u7a7a\u306e\u884c<\/td>\u6b20\u640d\u5024\u30c1\u30a7\u30c3\u30af<\/td><\/tr>
    inquiry_id\u304c\u91cd\u8907\u3057\u3066\u3044\u308b\u884c<\/td>\u91cd\u8907\u30c1\u30a7\u30c3\u30af<\/td><\/tr>
    response_minutes\u304c\u6975\u7aef\u306b\u5927\u304d\u3044\u884c<\/td>\u7570\u5e38\u5024\u30c1\u30a7\u30c3\u30af<\/td><\/tr>
    resolution_minutes\u304c\u30de\u30a4\u30ca\u30b9\u306e\u884c<\/td>\u7570\u5e38\u5024\u30c1\u30a7\u30c3\u30af<\/td><\/tr>
    status\u306b\u60f3\u5b9a\u5916\u306e\u5024\u304c\u5165\u3063\u3066\u3044\u308b\u884c<\/td>\u60f3\u5b9a\u5916\u306e\u5024\u30c1\u30a7\u30c3\u30af<\/td><\/tr>
    priority\u306b\u60f3\u5b9a\u5916\u306e\u5024\u304c\u5165\u3063\u3066\u3044\u308b\u884c<\/td>\u60f3\u5b9a\u5916\u306e\u5024\u30c1\u30a7\u30c3\u30af<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    Python\u3067\u67b6\u7a7aCSV\u3092\u4f5c\u6210\u3059\u308b<\/h2>\n\n\n\n
    \u307e\u305a\u3001Python\u3067100\u4ef6\u5206\u306e\u901a\u5e38\u30c7\u30fc\u30bf\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
    \u4ee5\u964d\u306e\u30b3\u30fc\u30c9\u306f\u3001\u5148\u307b\u3069\u4f5c\u6210\u3057\u305f duckdb_csv_quality_check.py<\/code> \u306b\u4e0a\u304b\u3089\u9806\u756a\u306b\u66f8\u3044\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
    import duckdb\nimport pandas as pd\nfrom datetime import datetime, timedelta\n\ncategories = ["\u30a2\u30af\u30bb\u30b9\u7533\u8acb", "\u30a8\u30e9\u30fc\u30fb\u30c8\u30e9\u30d6\u30eb", "\u4f7f\u3044\u65b9\u30ac\u30a4\u30c9", "\u30c7\u30fc\u30bf\u78ba\u8a8d"]\npriorities = ["high", "middle", "low"]\nstatuses = ["open", "in_progress", "resolved"]\nchannels = ["Teams", "Web", "Email"]\nratings = ["good", "neutral", "bad"]\n\nrows = []\nbase_time = datetime(2026, 6, 1, 9, 0, 0)\n\nfor i in range(1, 101):\n    rows.append({\n        "inquiry_id": f"INQ-{i:04d}",\n        "created_at": base_time + timedelta(minutes=i * 15),\n        "category": categories[i % len(categories)],\n        "priority": priorities[i % len(priorities)],\n        "status": statuses[i % len(statuses)],\n        "channel": channels[i % len(channels)],\n        "response_minutes": (i * 3) % 120,\n        "resolution_minutes": (i * 11) % 600,\n        "rating": ratings[i % len(ratings)],\n        "comment": "\u67b6\u7a7a\u30c7\u30fc\u30bf\u3067\u3059"\n    })\n    \ndf = pd.DataFrame(rows)<\/code><\/pre><\/div>\n\n\n\n
    \u6b21\u306b\u3001\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u3067\u691c\u51fa\u3059\u308b\u305f\u3081\u306e\u554f\u984c\u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
    pandas\u306e\u884c\u756a\u53f7\u306f0\u304b\u3089\u59cb\u307e\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u4f8b\u3048\u3070 df.loc[3]<\/code> \u306fCSV\u4e0a\u306e4\u4ef6\u76ee\u306e\u30c7\u30fc\u30bf\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
    # \u6b20\u640d\u5024\u3092\u4f5c\u308b\ndf.loc[3, "category"] = None\ndf.loc[10, "rating"] = None\n\n# \u7570\u5e38\u5024\u3092\u4f5c\u308b\ndf.loc[20, "response_minutes"] = 9999\ndf.loc[25, "resolution_minutes"] = -30\n\n# \u60f3\u5b9a\u5916\u306e\u30ab\u30c6\u30b4\u30ea\u5024\u3092\u4f5c\u308b\ndf.loc[30, "status"] = "done"\ndf.loc[35, "priority"] = "urgent"\n\n# \u91cd\u8907\u30c7\u30fc\u30bf\u3092\u4f5c\u308b\nduplicate_row = df.loc[5].copy()\ndf = pd.concat([df, pd.DataFrame([duplicate_row])], ignore_index=True)<\/code><\/pre><\/div>\n\n\n\n
    \u3053\u3053\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u554f\u984c\u3092\u610f\u56f3\u7684\u306b\u4f5c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
      \n
    • category<\/code> \u3068 rating<\/code> \u306b\u6b20\u640d\u5024\u3092\u5165\u308c\u308b<\/li>\n\n\n\n
    • response_minutes<\/code> \u306b\u6975\u7aef\u306b\u5927\u304d\u3044\u5024\u3092\u5165\u308c\u308b<\/li>\n\n\n\n
    • resolution_minutes<\/code> \u306b\u30de\u30a4\u30ca\u30b9\u5024\u3092\u5165\u308c\u308b<\/li>\n\n\n\n
    • status<\/code> \u306b\u60f3\u5b9a\u5916\u306e done<\/code> \u3092\u5165\u308c\u308b<\/li>\n\n\n\n
    • priority<\/code> \u306b\u60f3\u5b9a\u5916\u306e urgent<\/code> \u3092\u5165\u308c\u308b<\/li>\n\n\n\n
    • INQ-0006<\/code> \u306e\u884c\u3092\u8907\u88fd\u3057\u3066\u3001\u91cd\u8907\u30c7\u30fc\u30bf\u3092\u4f5c\u308b<\/li>\n<\/ul>\n\n\n\n
      \u6700\u5f8c\u306b\u3001\u4f5c\u6210\u3057\u305fDataFrame\u3092CSV\u30d5\u30a1\u30a4\u30eb\u3068\u3057\u3066\u4fdd\u5b58\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      df.to_csv("inquiry_logs.csv", index=False, encoding="utf-8-sig")\n\nprint("CSV\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f")\nprint(df.head())<\/code><\/pre><\/div>\n\n\n\n
      encoding=\"utf-8-sig\"<\/code> \u3092\u6307\u5b9a\u3057\u3066\u3044\u308b\u306e\u306f\u3001Excel\u306a\u3069\u3067CSV\u3092\u958b\u3044\u305f\u3068\u304d\u306b\u65e5\u672c\u8a9e\u304c\u6587\u5b57\u5316\u3051\u3057\u306b\u304f\u304f\u3059\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n\n\n\n
      \u3053\u3053\u307e\u3067\u3067\u3001inquiry_logs.csv<\/code> \u3068\u3044\u3046CSV\u30d5\u30a1\u30a4\u30eb\u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
      \u4f5c\u6210\u3055\u308c\u308bCSV\u306e\u5148\u982d5\u884c\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30a4\u30e1\u30fc\u30b8\u3067\u3059\u3002<\/p>\n\n\n
      \u30b9\u30af\u30ed\u30fc\u30eb\u3067\u304d\u307e\u3059 <\/i><\/span><\/div>\n
      inquiry_id<\/th>created_at<\/th>category<\/th>priority<\/th>status<\/th>channel<\/th>response_minutes<\/th>resolution_minutes<\/th>rating<\/th>comment<\/th><\/tr><\/thead>
      INQ-0001<\/td>2026-06-01 09:15:00<\/td>\u30a8\u30e9\u30fc\u30fb\u30c8\u30e9\u30d6\u30eb<\/td>middle<\/td>in_progress<\/td>Web<\/td>3<\/td>11<\/td>neutral<\/td>\u67b6\u7a7a\u30c7\u30fc\u30bf\u3067\u3059<\/td><\/tr>
      INQ-0002<\/td>2026-06-01 09:30:00<\/td>\u4f7f\u3044\u65b9\u30ac\u30a4\u30c9<\/td>low<\/td>resolved<\/td>Email<\/td>6<\/td>22<\/td>bad<\/td>\u67b6\u7a7a\u30c7\u30fc\u30bf\u3067\u3059<\/td><\/tr>
      INQ-0003<\/td>2026-06-01 09:45:00<\/td>\u30c7\u30fc\u30bf\u78ba\u8a8d<\/td>high<\/td>open<\/td>Teams<\/td>9<\/td>33<\/td>good<\/td>\u67b6\u7a7a\u30c7\u30fc\u30bf\u3067\u3059<\/td><\/tr>
      INQ-0004<\/td>2026-06-01 10:00:00<\/td><\/td>middle<\/td>in_progress<\/td>Web<\/td>12<\/td>44<\/td>neutral<\/td>\u67b6\u7a7a\u30c7\u30fc\u30bf\u3067\u3059<\/td><\/tr>
      INQ-0005<\/td>2026-06-01 10:15:00<\/td>\u30a8\u30e9\u30fc\u30fb\u30c8\u30e9\u30d6\u30eb<\/td>low<\/td>resolved<\/td>Email<\/td>15<\/td>55<\/td>bad<\/td>\u67b6\u7a7a\u30c7\u30fc\u30bf\u3067\u3059<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \n\n\n\n
      DuckDB\u3067CSV\u3092\u8aad\u307f\u8fbc\u3080<\/h2>\n\n\n\n
      \u6b21\u306b\u3001DuckDB\u306b\u63a5\u7d9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      con = duckdb.connect()<\/code><\/pre><\/div>\n\n\n\n
      duckdb.connect()<\/code> \u3092\u5f15\u6570\u306a\u3057\u3067\u5b9f\u884c\u3059\u308b\u3068\u3001\u30e1\u30e2\u30ea\u4e0a\u306eDuckDB\u306b\u63a5\u7d9a\u3067\u304d\u307e\u3059\u3002\u4eca\u56de\u306e\u3088\u3046\u306a\u5c0f\u3055\u306a\u691c\u8a3c\u3067\u3042\u308c\u3070\u3001\u3053\u306e\u5f62\u3067\u5341\u5206\u3067\u3059\u3002<\/p>\n\n\n\n
      \u6b21\u306b\u3001\u4f5c\u6210\u3057\u305fCSV\u3092DuckDB\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u3057\u3066<\/span><\/strong>\u8aad\u307f\u8fbc\u307f\u307e\u3059\u3002<\/p>\n\n\n\n
      con.execute("""\nCREATE OR REPLACE TABLE inquiry_logs AS\nSELECT *\nFROM read_csv('inquiry_logs.csv', header = true)\n""")<\/code><\/pre><\/div>\n\n\n\n
      read_csv<\/code> \u3092\u4f7f\u3046\u3068\u3001CSV\u3092\u8aad\u307f\u8fbc\u3093\u3067SQL\u304b\u3089\u6271\u3048\u307e\u3059\u3002<\/span><\/strong>\u4eca\u56de\u306fCSV\u306e\u5148\u982d\u884c\u306b\u5217\u540d\u304c\u3042\u308b\u305f\u3081\u3001header = true<\/code> \u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
      \u307e\u305f\u3001inquiry_logs.csv<\/code> \u306f\u76f8\u5bfe\u30d1\u30b9\u3067\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001Python\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u4f5c\u696d\u30d5\u30a9\u30eb\u30c0\u304b\u3089\u898b\u3066 inquiry_logs.csv<\/code> \u304c\u5b58\u5728\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u306e\u624b\u9806\u3069\u304a\u308a\u306b\u9032\u3081\u3066\u3044\u308c\u3070\u3001Python\u30d5\u30a1\u30a4\u30eb\u3068\u540c\u3058\u30d5\u30a9\u30eb\u30c0\u306bCSV\u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
      DuckDB\u306e read_csv<\/code> \u306fCSV\u306e\u533a\u5207\u308a\u6587\u5b57\u3084\u5217\u306e\u578b\u306a\u3069\u3092\u81ea\u52d5\u63a8\u8ad6\u3067\u304d\u307e\u3059\u3002\u4eca\u56de\u306e\u3088\u3046\u306a\u691c\u8a3c\u3067\u306f\u81ea\u52d5\u63a8\u8ad6\u306b\u4efb\u305b\u307e\u3059\u304c\u3001\u5b9f\u30c7\u30fc\u30bf\u3067\u578b\u3092\u53b3\u5bc6\u306b\u6271\u3044\u305f\u3044\u5834\u5408<\/strong><\/span>\u306f\u3001\u5217\u306e\u578b\u3092\u660e\u793a\u3059\u308b\u3053\u3068\u3082\u691c\u8a0e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      CREATE OR REPLACE TABLE<\/code> \u3092\u4f7f\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u540c\u3058\u540d\u524d\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u3059\u3067\u306b\u5b58\u5728\u3057\u3066\u3044\u3066\u3082\u4f5c\u308a\u76f4\u305b\u307e\u3059\u3002\u4f55\u5ea6\u3082\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u76f4\u3059\u691c\u8a3c\u3067\u306f\u4fbf\u5229\u3067\u3059\u3002<\/p>\n\n\n\n
      SQL\u3067\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046<\/h2>\n\n\n\n
      \u3053\u3053\u304b\u3089\u306f\u3001DuckDB\u3067SQL\u3092\u5b9f\u884c\u3057\u3066CSV\u306e\u54c1\u8cea\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      \u306a\u304a\u3001\u3053\u306e\u8a18\u4e8b\u3067\u306fPython\u304b\u3089DuckDB\u306bSQL\u3092\u6e21\u3057\u3066\u5b9f\u884c<\/span>\u3057\u3066\u3044\u307e\u3059\u3002<\/strong>SQL\u90e8\u5206\u3060\u3051\u3092\u898b\u308b\u3068\u3001\u901a\u5e38\u306eSQL\u306b\u3088\u308b\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u3068\u540c\u3058\u8003\u3048\u65b9\u3067\u8aad\u3081\u307e\u3059\u3002<\/p>\n\n\n\n
      \u4eca\u56de\u78ba\u8a8d\u3059\u308b\u5185\u5bb9\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n\n\n\n
      \u78ba\u8a8d\u5185\u5bb9<\/th>\u76ee\u7684<\/th><\/tr><\/thead>
      \u884c\u6570\u78ba\u8a8d<\/td>CSV\u304c\u60f3\u5b9a\u3069\u304a\u308a\u8aad\u307f\u8fbc\u307e\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3059\u308b<\/td><\/tr>
      \u6b20\u640d\u5024\u30c1\u30a7\u30c3\u30af<\/td>\u5fc5\u8981\u306a\u5217\u306bNULL\u304c\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b<\/td><\/tr>
      \u91cd\u8907\u30c1\u30a7\u30c3\u30af<\/td>\u540c\u3058\u554f\u3044\u5408\u308f\u305bID\u304c\u8907\u6570\u5b58\u5728\u3057\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b<\/td><\/tr>
      \u7570\u5e38\u5024\u30c1\u30a7\u30c3\u30af<\/td>\u5fdc\u7b54\u6642\u9593\u3084\u89e3\u6c7a\u6642\u9593\u306b\u4e0d\u81ea\u7136\u306a\u5024\u304c\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b<\/td><\/tr>
      \u60f3\u5b9a\u5916status\u78ba\u8a8d<\/td>\u5bfe\u5fdc\u72b6\u6cc1\u306e\u5024\u306b\u60f3\u5b9a\u5916\u306e\u3082\u306e\u304c\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b<\/td><\/tr>
      \u60f3\u5b9a\u5916priority\u78ba\u8a8d<\/td>\u512a\u5148\u5ea6\u306e\u5024\u306b\u60f3\u5b9a\u5916\u306e\u3082\u306e\u304c\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \u30c1\u30a7\u30c3\u30af\uff11\uff1a\u884c\u6570\u3092\u78ba\u8a8d\u3059\u308b<\/h3>\n\n\n\n
      \u307e\u305a\u3001\u8aad\u307f\u8fbc\u3093\u3060\u30c7\u30fc\u30bf\u306e\u884c\u6570\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      print("\\n--- \u884c\u6570\u78ba\u8a8d ---")\nprint(con.execute("""\nSELECT count(*) AS row_count\nFROM inquiry_logs\n""").df())<\/code><\/pre><\/div>\n\n\n\n
      \u5b9f\u884c\u7d50\u679c\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n\n\n\n
      --- \u884c\u6570\u78ba\u8a8d ---\n   row_count\n         101<\/code><\/pre><\/div>\n\n\n\n
      \u4eca\u56de\u306f\u3001100\u4ef6\u306e\u67b6\u7a7a\u30c7\u30fc\u30bf\u3092\u4f5c\u6210\u3057\u305f\u3042\u3068\u3001\u91cd\u8907\u78ba\u8a8d\u7528\u306b1\u884c\u8ffd\u52a0\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u305f\u3081\u3001\u884c\u6570\u306f101\u4ef6<\/strong>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      \u6700\u521d\u306b\u884c\u6570\u3092\u78ba\u8a8d\u3057\u3066\u304a\u304f\u3068\u3001CSV\u304c\u60f3\u5b9a\u3069\u304a\u308a\u8aad\u307f\u8fbc\u307e\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
      \u30c1\u30a7\u30c3\u30af\uff12\uff1a\u6b20\u640d\u5024\u3092\u78ba\u8a8d\u3059\u308b<\/h3>\n\n\n\n
      \u6b21\u306b\u3001\u91cd\u8981\u306a\u5217\u306b\u6b20\u640d\u5024\u304c\u306a\u3044\u304b\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      print("\\n--- \u6b20\u640d\u5024\u30c1\u30a7\u30c3\u30af ---")\nprint(con.execute("""\nSELECT\n    count(*) AS total_rows,\n    sum(CASE WHEN inquiry_id IS NULL THEN 1 ELSE 0 END) AS missing_inquiry_id,\n    sum(CASE WHEN category IS NULL THEN 1 ELSE 0 END) AS missing_category,\n    sum(CASE WHEN rating IS NULL THEN 1 ELSE 0 END) AS missing_rating,\n    sum(CASE WHEN response_minutes IS NULL THEN 1 ELSE 0 END) AS missing_response_minutes,\n    sum(CASE WHEN resolution_minutes IS NULL THEN 1 ELSE 0 END) AS missing_resolution_minutes,\n    sum(CASE WHEN status IS NULL THEN 1 ELSE 0 END) AS missing_status,\n    sum(CASE WHEN priority IS NULL THEN 1 ELSE 0 END) AS missing_priority\nFROM inquiry_logs\n""").df())<\/code><\/pre><\/div>\n\n\n\n
      \u3053\u306eSQL\u3067\u306f\u3001\u5404\u5217\u304c NULL<\/code> \u306e\u5834\u5408\u306b1\u3092\u8db3\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
      \u4f8b\u3048\u3070\u3001category IS NULL<\/code> \u306e\u5834\u5408\u306b1\u3001\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306b0\u3092\u8fd4\u3057\u3001\u305d\u306e\u5408\u8a08\u3092\u53d6\u308b\u3053\u3068\u3067\u6b20\u640d\u4ef6\u6570\u3092\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
      \u5b9f\u884c\u7d50\u679c\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n\n\n\n
      --- \u6b20\u640d\u5024\u30c1\u30a7\u30c3\u30af ---\ntotal_rows  missing_inquiry_id  missing_category  missing_rating  missing_response_minutes  missing_resolution_minutes  missing_status  missing_priority\n       101                 0.0               1.0             1.0                       0.0                         0.0             0.0               0.0<\/code><\/pre><\/div>\n\n\n\n
      category<\/code> \u3068 rating<\/code> \u306b\u3001\u305d\u308c\u305e\u308c1\u4ef6\u305a\u3064\u6b20\u640d\u5024\u304c\u3042\u308b<\/strong>\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      category<\/code> \u304c\u6b20\u640d\u3057\u3066\u3044\u308b\u3068\u3001\u554f\u3044\u5408\u308f\u305b\u30ab\u30c6\u30b4\u30ea\u5225\u306e\u96c6\u8a08\u306b\u5f71\u97ff\u3057\u307e\u3059\u3002rating<\/code> \u304c\u6b20\u640d\u3057\u3066\u3044\u308b\u3068\u3001\u8a55\u4fa1\u5225\u306e\u5206\u6790\u306b\u5f71\u97ff\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      \u3053\u306e\u3088\u3046\u306b\u3001\u5206\u6790\u524d\u306b\u6b20\u640d\u5024\u3092\u78ba\u8a8d\u3057\u3066\u304a\u304f\u3053\u3068<\/span><\/strong>\u3067\u3001\u5f8c\u7d9a\u306e\u96c6\u8a08\u7d50\u679c\u3092\u78ba\u8a8d\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      \u306a\u304a\u3001DuckDB\u3067\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b FILTER<\/code> \u3092\u4f7f\u3063\u3066\u6b20\u640d\u4ef6\u6570\u3092\u6570\u3048\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
      count(*) FILTER (category IS NULL)<\/code><\/pre><\/div>\n\n\n\n
      \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001SQL\u521d\u5fc3\u8005\u306b\u3082\u6761\u4ef6\u5206\u5c90\u306e\u8003\u3048\u65b9\u304c\u5206\u304b\u308a\u3084\u3059\u3044\u3088\u3046\u306b\u3001CASE WHEN<\/code> \u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
      \u30c1\u30a7\u30c3\u30af\uff13\uff1a\u91cd\u8907\u30c7\u30fc\u30bf\u3092\u78ba\u8a8d<\/h3>\n\n\n\n
      \u6b21\u306b\u3001\u554f\u3044\u5408\u308f\u305bID\u304c\u91cd\u8907\u3057\u3066\u3044\u306a\u3044\u304b\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      print("\\n--- \u91cd\u8907\u30c1\u30a7\u30c3\u30af ---")\nprint(con.execute("""\nSELECT\n    inquiry_id,\n    count(*) AS duplicate_count\nFROM inquiry_logs\nGROUP BY inquiry_id\nHAVING count(*) > 1\nORDER BY duplicate_count DESC\n""").df())<\/code><\/pre><\/div>\n\n\n\n
      \u3053\u306eSQL\u3067\u306f\u3001inquiry_id<\/code> \u3054\u3068\u306b\u4ef6\u6570\u3092\u6570\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
      HAVING count(*) > 1<\/code> \u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u30012\u4ef6\u4ee5\u4e0a\u5b58\u5728\u3059\u308b\u554f\u3044\u5408\u308f\u305bID\u3060\u3051\u3092\u62bd\u51fa\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
      \u5b9f\u884c\u7d50\u679c\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n\n\n\n
      --- \u91cd\u8907\u30c1\u30a7\u30c3\u30af ---\n  inquiry_id  duplicate_count\n    INQ-0006                2<\/code><\/pre><\/div>\n\n\n\n
      INQ-0006<\/code> \u304c2\u4ef6\u5b58\u5728\u3057\u3066\u3044\u308b<\/strong>\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      \u554f\u3044\u5408\u308f\u305bID\u3084\u30c1\u30b1\u30c3\u30c8ID\u306e\u3088\u3046\u306b\u4e00\u610f\u3067\u3042\u308b\u3079\u304d\u5217\u306f\u3001\u91cd\u8907\u30c1\u30a7\u30c3\u30af\u306e\u5bfe\u8c61\u306b\u3059\u308b\u3068\u3088\u3044\u3067\u3059\u3002\u91cd\u8907\u3057\u305f\u307e\u307e\u96c6\u8a08\u3059\u308b\u3068\u3001\u540c\u3058\u554f\u3044\u5408\u308f\u305b\u3092\u4e8c\u91cd\u306b\u6570\u3048\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027<\/strong><\/span>\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      \u30c1\u30a7\u30c3\u30af\uff14\uff1a\u7570\u5e38\u5024\u3092\u78ba\u8a8d\u3059\u308b<\/h3>\n\n\n\n
      \u6b21\u306b\u3001\u5fdc\u7b54\u6642\u9593\u3084\u89e3\u6c7a\u6642\u9593\u306b\u7570\u5e38\u5024\u304c\u306a\u3044\u304b\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      \u4eca\u56de\u306f\u3001\u4ee5\u4e0b\u306e\u6761\u4ef6\u3092\u7570\u5e38\u5024\u5019\u88dc\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      \u9805\u76ee<\/th>\u7570\u5e38\u5024\u5019\u88dc\u306e\u6761\u4ef6<\/th><\/tr><\/thead>
      response_minutes<\/td>0\u672a\u6e80\u3001\u307e\u305f\u306f1440\u5206\u3088\u308a\u5927\u304d\u3044<\/td><\/tr>
      resolution_minutes<\/td>0\u672a\u6e80\u3001\u307e\u305f\u306f10080\u5206\u3088\u308a\u5927\u304d\u3044<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      1440\u5206<\/code> \u306f1\u65e5\u300110080\u5206<\/code> \u306f7\u65e5\u3067\u3059\u3002<\/p>\n\n\n\n
      print("\\n--- \u7570\u5e38\u5024\u30c1\u30a7\u30c3\u30af ---")\nprint(con.execute("""\nSELECT\n    inquiry_id,\n    response_minutes,\n    resolution_minutes\nFROM inquiry_logs\nWHERE response_minutes < 0\n   OR response_minutes > 1440\n   OR resolution_minutes < 0\n   OR resolution_minutes > 10080\nORDER BY inquiry_id\n""").df())<\/code><\/pre><\/div>\n\n\n\n
      \u5b9f\u884c\u7d50\u679c\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n\n\n\n
      --- \u7570\u5e38\u5024\u30c1\u30a7\u30c3\u30af ---\n  inquiry_id  response_minutes  resolution_minutes\n    INQ-0021              9999                 231\n    INQ-0026                78                 -30<\/code><\/pre><\/div>\n\n\n\n
      INQ-0021<\/code> \u306f\u3001response_minutes<\/code> \u304c 9999<\/code> \u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u521d\u56de\u5fdc\u7b54\u307e\u3067\u306e\u6642\u9593\u3068\u3057\u3066\u306f\u6975\u7aef\u306b\u5927\u304d\u3044<\/strong>\u305f\u3081\u3001\u7570\u5e38\u5024\u5019\u88dc\u3068\u3057\u3066\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
      \u307e\u305f\u3001INQ-0026<\/code> \u306f\u3001resolution_minutes<\/code> \u304c -30<\/code> \u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u89e3\u6c7a\u307e\u3067\u306e\u6642\u9593\u304c\u30de\u30a4\u30ca\u30b9<\/strong>\u306b\u306a\u308b\u3053\u3068\u306f\u901a\u5e38\u8003\u3048\u306b\u304f\u3044\u305f\u3081\u3001\u3053\u3061\u3089\u3082\u7570\u5e38\u5024\u5019\u88dc\u3068\u3057\u3066\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
      \u305f\u3060\u3057\u3001\u7570\u5e38\u5024\u306e\u57fa\u6e96\u306f\u696d\u52d9\u30eb\u30fc\u30eb\u306b\u3088\u3063\u3066\u5909\u308f\u308a\u307e\u3059\u3002<\/span><\/strong>\u554f\u3044\u5408\u308f\u305b\u5bfe\u5fdc\u306e\u30eb\u30fc\u30eb\u306b\u3088\u3063\u3066\u306f\u30011\u65e5\u4ee5\u4e0a\u304b\u304b\u3063\u3066\u3082\u7570\u5e38\u3067\u306f\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u9006\u306b\u3001\u6570\u6642\u9593\u4ee5\u5185\u306e\u5bfe\u5fdc\u304c\u5fc5\u9808\u3067\u3042\u308c\u3070\u3001\u3082\u3063\u3068\u77ed\u3044\u6642\u9593\u3092\u3057\u304d\u3044\u5024\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      \u305d\u306e\u305f\u3081\u3001\u4eca\u56de\u306e\u6761\u4ef6\u306f\u3042\u304f\u307e\u3067\u691c\u8a3c\u7528\u306e\u6761\u4ef6\u3067\u3059\u3002<\/p>\n\n\n\n
      \u30c1\u30a7\u30c3\u30af\uff15\uff1a\u60f3\u5b9a\u5916\u306estatus\u306e\u5024\u3092\u78ba\u8a8d\u3059\u308b<\/h3>\n\n\n\n
      \u6b21\u306b\u3001status<\/code> \u306b\u3069\u306e\u3088\u3046\u306a\u5024\u304c\u5165\u3063\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      print("\\n--- status\u306e\u5024\u78ba\u8a8d ---")\nprint(con.execute("""\nSELECT\n    status,\n    count(*) AS count\nFROM inquiry_logs\nGROUP BY status\nORDER BY count DESC, status\n""").df())<\/code><\/pre><\/div>\n\n\n\n
      \u5b9f\u884c\u7d50\u679c\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n\n\n\n
      --- status\u306e\u5024\u78ba\u8a8d ---\n        status  count\n          open     34\n   in_progress     33\n      resolved     33\n          done      1<\/code><\/pre><\/div>\n\n\n\n
      open<\/code>\u3001in_progress<\/code>\u3001resolved<\/code> \u306e\u307b\u304b\u306b\u3001done<\/code> \u304c1\u4ef6\u5b58\u5728\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      done<\/code> \u306f\u4eca\u56de\u306e\u60f3\u5b9a\u5024\u306b\u542b\u3081\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n\n\n\n
      \u6b21\u306b\u3001\u60f3\u5b9a\u5916\u306e status<\/code> \u3060\u3051\u3092\u62bd\u51fa\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      print("\\n--- \u60f3\u5b9a\u5916status\u30c1\u30a7\u30c3\u30af ---")\nprint(con.execute("""\nSELECT\n    inquiry_id,\n    status\nFROM inquiry_logs\nWHERE status IS NULL\n   OR status NOT IN ('open', 'in_progress', 'resolved')\n""").df())<\/code><\/pre><\/div>\n\n\n\n
      \u5b9f\u884c\u7d50\u679c\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n\n\n\n
      --- \u60f3\u5b9a\u5916status\u30c1\u30a7\u30c3\u30af ---\n  inquiry_id status\n    INQ-0031   done<\/code><\/pre><\/div>\n\n\n\n
      INQ-0031<\/code> \u306e status<\/code> \u306b\u3001\u60f3\u5b9a\u5916\u306e done<\/code><\/strong> \u304c\u5165\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      \u3053\u3053\u3067\u306f status IS NULL OR status NOT IN (...)<\/code> \u3068\u66f8\u3044\u3066\u3044\u307e\u3059\u3002NOT IN<\/code> \u3060\u3051\u3067\u306f NULL<\/code> \u306e\u5024\u3092\u62bd\u51fa\u3067\u304d\u306a\u3044<\/strong>\u305f\u3081\u3001\u5b9f\u30c7\u30fc\u30bf\u306e\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u3067\u306f IS NULL<\/code> \u3082\u3042\u308f\u305b\u3066\u78ba\u8a8d\u3059\u308b\u3068\u5b89\u5168\u3067\u3059\u3002<\/p>\n\n\n\n
      \u3053\u306e\u3088\u3046\u306a\u5024\u304c\u6df7\u3056\u308b\u3068\u3001\u30b9\u30c6\u30fc\u30bf\u30b9\u5225\u96c6\u8a08\u306e\u5206\u985e\u304c\u3076\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001resolved<\/code> \u3068 done<\/code> \u304c\u540c\u3058\u610f\u5473\u3067\u4f7f\u308f\u308c\u3066\u3044\u308b\u5834\u5408\u3067\u3082\u3001\u5024\u304c\u5206\u304b\u308c\u3066\u3044\u308b\u3068\u5225\u30ab\u30c6\u30b4\u30ea\u3068\u3057\u3066\u96c6\u8a08\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
      \u305d\u306e\u305f\u3081\u3001\u4e8b\u524d\u306b\u60f3\u5b9a\u5024\u3092\u6c7a\u3081\u3066\u3001\u60f3\u5b9a\u5916\u306e\u5024\u304c\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b\u3053\u3068<\/strong><\/span>\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n
      \u30c1\u30a7\u30c3\u30af\uff16\uff1a\u60f3\u5b9a\u5916\u306epriority\u3092\u78ba\u8a8d\u3059\u308b<\/h3>\n\n\n\n
      \u540c\u3058\u3088\u3046\u306b\u3001priority<\/code> \u3082\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      priority<\/code> \u306e\u60f3\u5b9a\u5024\u306f\u3001\u4ee5\u4e0b\u306e3\u3064\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      priority<\/th>\u610f\u5473<\/th><\/tr><\/thead>
      high<\/td>\u9ad8<\/td><\/tr>
      middle<\/td>\u4e2d<\/td><\/tr>
      low<\/td>\u4f4e<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \u4ee5\u4e0b\u306eSQL\u3067\u3001\u60f3\u5b9a\u5916\u306e\u5024\u3092\u62bd\u51fa\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      print("\\n--- \u60f3\u5b9a\u5916priority\u30c1\u30a7\u30c3\u30af ---")\nprint(con.execute("""\nSELECT\n    inquiry_id,\n    priority\nFROM inquiry_logs\nWHERE priority IS NULL\n   OR priority NOT IN ('high', 'middle', 'low')\n""").df())<\/code><\/pre><\/div>\n\n\n\n
      \u5b9f\u884c\u7d50\u679c\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n\n\n\n
      --- \u60f3\u5b9a\u5916priority\u30c1\u30a7\u30c3\u30af ---\n  inquiry_id priority\n    INQ-0036   urgent<\/code><\/pre><\/div>\n\n\n\n
      INQ-0036<\/code> \u306e priority<\/code> \u306b\u3001\u60f3\u5b9a\u5916\u306e urgent<\/code><\/strong> \u304c\u5165\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      \u3082\u3057 urgent<\/code> \u3092\u6b63\u5f0f\u306a\u512a\u5148\u5ea6\u3068\u3057\u3066\u6271\u3046\u306e\u3067\u3042\u308c\u3070\u3001\u60f3\u5b9a\u5024\u306b\u8ffd\u52a0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u65b9\u3067\u3001\u5165\u529b\u30df\u30b9\u3068\u3057\u3066\u6271\u3046\u306e\u3067\u3042\u308c\u3070\u3001high<\/code> \u306a\u3069\u306e\u65e2\u5b58\u30ab\u30c6\u30b4\u30ea\u306b\u4fee\u6b63\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      \u88dc\u8db3\uff1aDuckDB\u3067Parquet\u5f62\u5f0f\u306b\u51fa\u529b\u3059\u308b\u624b\u9806<\/h2>\n\n\n\n
      \u3053\u3053\u307e\u3067\u3067\u3001CSV\u306b\u542b\u307e\u308c\u308b\u554f\u984c\u30c7\u30fc\u30bf\u3092SQL\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
      \u6700\u5f8c\u306b\u88dc\u8db3\u3068\u3057\u3066\u3001DuckDB\u306e COPY<\/code> \u6587\u3092\u4f7f\u3063\u3066\u3001\u8aad\u307f\u8fbc\u3093\u3060\u30c7\u30fc\u30bf\u3092Parquet\u5f62\u5f0f\u3067<\/strong>\u51fa\u529b\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n
      con.execute("""\nCOPY (\n    SELECT *\n    FROM inquiry_logs\n) TO 'inquiry_logs.parquet' (FORMAT parquet)\n""")\n\nprint("\\nParquet\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f")<\/code><\/pre><\/div>\n\n\n\n
      \u3053\u308c\u3067\u3001inquiry_logs.parquet<\/code> \u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
      Parquet\u306f\u5217\u6307\u5411\u306e\u30d5\u30a1\u30a4\u30eb\u5f62\u5f0f\u3067\u3001\u5206\u6790\u7528\u9014\u3067\u6271\u3044\u3084\u3059\u3044\u5834\u9762\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      \u305f\u3060\u3057\u3001\u4eca\u56de\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u691c\u51fa\u3057\u305f\u554f\u984c\u30c7\u30fc\u30bf\u3092\u4fee\u6b63\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u3053\u3053\u3067\u4f5c\u6210\u3059\u308bParquet\u30d5\u30a1\u30a4\u30eb\u306f\u300c\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u6e08\u307f\u306e\u304d\u308c\u3044\u306a\u30c7\u30fc\u30bf\u300d\u3067\u306f\u306a\u304f\u3001\u300cDuckDB\u3067\u8aad\u307f\u8fbc\u3093\u3060\u30c7\u30fc\u30bf\u3092\u5225\u5f62\u5f0f\u3067\u51fa\u529b\u3059\u308b\u4f8b\u300d<\/strong>\u3068\u3057\u3066\u6271\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
      \u3064\u307e\u308a\u3001\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306f\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u305d\u306e\u3082\u306e\u3067\u306f\u306a\u304f\u3001DuckDB\u3067\u8aad\u307f\u8fbc\u3093\u3060\u30c7\u30fc\u30bf\u3092\u5225\u5f62\u5f0f\u306b\u5909\u63db\u3059\u308b\u88dc\u8db3<\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n
      \u4f5c\u6210\u3057\u305fParquet\u30d5\u30a1\u30a4\u30eb\u306e\u4ef6\u6570\u3082\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      print("\\n--- Parquet\u78ba\u8a8d ---")\nprint(con.execute("""\nSELECT count(*) AS parquet_row_count\nFROM read_parquet('inquiry_logs.parquet')\n""").df())<\/code><\/pre><\/div>\n\n\n\n
      \u5b9f\u884c\u7d50\u679c\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n\n\n\n
      --- Parquet\u78ba\u8a8d ---\n   parquet_row_count\n                 101<\/code><\/pre><\/div>\n\n\n\n
      CSV\u304b\u3089\u8aad\u307f\u8fbc\u3093\u3060\u884c\u6570\u3068\u3001Parquet\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u8aad\u307f\u8fbc\u3093\u3060\u884c\u6570\u304c\u540c\u3058101\u4ef6<\/strong>\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
      \u6700\u5f8c\u306b\u3001DuckDB\u306e\u63a5\u7d9a\u3092\u9589\u3058\u307e\u3059\u3002<\/p>\n\n\n\n
      con.close()<\/code><\/pre><\/div>\n\n\n\n
      \u4eca\u56de\u4f7f\u3063\u305fSQL\u306e\u8003\u3048\u65b9<\/h2>\n\n\n\n
      \u4eca\u56de\u306e\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306aSQL\u3092\u4f7f\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
      \u78ba\u8a8d\u5185\u5bb9<\/th>\u4f7f\u7528\u3057\u305fSQL\u306e\u8003\u3048\u65b9<\/th><\/tr><\/thead>
      \u884c\u6570\u78ba\u8a8d<\/td>count(*)<\/code> \u3067\u8aad\u307f\u8fbc\u307f\u4ef6\u6570\u3092\u78ba\u8a8d\u3059\u308b<\/td><\/tr>
      \u6b20\u640d\u5024\u30c1\u30a7\u30c3\u30af<\/td>CASE WHEN \u5217 IS NULL THEN 1 ELSE 0 END<\/code> \u3067\u4ef6\u6570\u3092\u6570\u3048\u308b<\/td><\/tr>
      \u91cd\u8907\u30c1\u30a7\u30c3\u30af<\/td>GROUP BY<\/code> \u3068 HAVING count(*) > 1<\/code> \u3092\u4f7f\u3046<\/td><\/tr>
      \u7570\u5e38\u5024\u30c1\u30a7\u30c3\u30af<\/td>WHERE<\/code> \u3067\u3057\u304d\u3044\u5024\u3092\u8d85\u3048\u308b\u5024\u3092\u62bd\u51fa\u3059\u308b<\/td><\/tr>
      \u60f3\u5b9a\u5916\u306e\u5024\u30c1\u30a7\u30c3\u30af<\/td>\u5217 IS NULL OR \u5217 NOT IN (...)<\/code>\u3067NULL\u3084\u60f3\u5b9a\u5916\u306e\u5024\u3092\u62bd\u51fa\u3059\u308b<\/td><\/tr>
      Parquet\u78ba\u8a8d<\/td>read_parquet<\/code> \u3067\u51fa\u529b\u5f8c\u306e\u4ef6\u6570\u3092\u78ba\u8a8d\u3059\u308b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \u3069\u308c\u3082\u57fa\u672c\u7684\u306aSQL\u3067\u3059\u304c\u3001\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067CSV\u306e\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u306b\u4f7f\u3048\u307e\u3059\u3002<\/p>\n\n\n\n
      DuckDB\u3067CSV\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u3068\u304d\u306e\u6ce8\u610f\u70b9<\/h2>\n\n\n\n
      DuckDB\u3067\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u3068\u304d\u306f\u3001\u30c1\u30a7\u30c3\u30af\u6761\u4ef6\u3092\u5148\u306b\u6c7a\u3081\u3066\u304a\u304f\u3053\u3068<\/strong><\/span>\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n
      \u4f8b\u3048\u3070\u3001\u4eca\u56de\u306e\u7570\u5e38\u5024\u30c1\u30a7\u30c3\u30af\u3067\u306f\u3001response_minutes > 1440<\/code> \u3092\u7570\u5e38\u5024\u5019\u88dc\u3068\u3057\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u3069\u306e\u5024\u3092\u7570\u5e38\u3068\u3059\u308b\u304b\u306f\u696d\u52d9\u306b\u3088\u3063\u3066\u5909\u308f\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      \u554f\u3044\u5408\u308f\u305b\u5bfe\u5fdc\u306e\u30eb\u30fc\u30eb\u306b\u3088\u3063\u3066\u306f\u30011\u65e5\u4ee5\u4e0a\u304b\u304b\u3063\u3066\u3082\u7570\u5e38\u3067\u306f\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u9006\u306b\u3001\u6570\u6642\u9593\u4ee5\u5185\u306e\u5bfe\u5fdc\u304c\u5fc5\u9808\u3067\u3042\u308c\u3070\u3001\u3082\u3063\u3068\u77ed\u3044\u6642\u9593\u3092\u3057\u304d\u3044\u5024\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      \u307e\u305f\u3001status<\/code> \u3084 priority<\/code> \u306e\u3088\u3046\u306a\u30ab\u30c6\u30b4\u30ea\u5024\u3082\u3001\u3042\u3089\u304b\u3058\u3081\u60f3\u5b9a\u5024\u3092\u6c7a\u3081\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u60f3\u5b9a\u5024\u304c\u6c7a\u307e\u3063\u3066\u3044\u306a\u3044\u3068\u3001\u3069\u306e\u5024\u3092\u4e0d\u6574\u5408\u3068\u3057\u3066\u6271\u3046\u304b\u5224\u65ad\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n
      \u305d\u306e\u305f\u3081\u3001DuckDB\u306f\u300c\u554f\u984c\u5019\u88dc\u3092\u898b\u3064\u3051\u308b\u9053\u5177\u300d<\/span><\/strong>\u3068\u3057\u3066\u4f7f\u3044\u3001\u6700\u7d42\u7684\u306a\u5224\u65ad\u306f\u696d\u52d9\u30eb\u30fc\u30eb\u306b\u5408\u308f\u305b\u3066\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
      \u307e\u3068\u3081<\/h2>\n\n\n\n
      \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001DuckDB\u3092\u4f7f\u3063\u3066\u3001\u67b6\u7a7aCSV\u306b\u542b\u307e\u308c\u308b\u6b20\u640d\u5024\u3001\u91cd\u8907\u3001\u7570\u5e38\u5024\u3001\u60f3\u5b9a\u5916\u306e\u30ab\u30c6\u30b4\u30ea\u5024\u3092SQL\u3067\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
      Python\u3060\u3051\u3067\u3082CSV\u306e\u54c1\u8cea\u30c1\u30a7\u30c3\u30af\u306f\u53ef\u80fd\u3067\u3059\u3002\u4e00\u65b9\u3067\u3001DuckDB\u3092\u4f7f\u3046\u3068\u3001CSV\u3092\u30c6\u30fc\u30d6\u30eb\u306e\u3088\u3046\u306b\u6271\u3044\u306a\u304c\u3089\u3001SQL\u3067\u4e00\u8cab\u3057\u305f\u30c1\u30a7\u30c3\u30af\u30ed\u30b8\u30c3\u30af<\/span><\/strong>\u3092\u66f8\u3051\u307e\u3059\u3002<\/p>\n\n\n\n
      \u4eca\u56de\u78ba\u8a8d\u3057\u305f\u5185\u5bb9\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n\n\n\n