{"id":28747,"date":"2024-03-18T18:49:42","date_gmt":"2024-03-18T09:49:42","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/sql%e4%b8%ad%e3%81%aeunion%e3%81%a7%e8%a4%87%e6%95%b0%e3%81%ae%e3%83%86%e3%83%bc%e3%83%96%e3%83%ab%e3%82%92%e7%b5%90%e5%90%88%e3%81%99%e3%82%8b%e9%9a%9b%e3%80%81%e5%88%97%e6%95%b0%e3%81%8c%e4%b8%80\/"},"modified":"2024-03-22T19:19:55","modified_gmt":"2024-03-22T10:19:55","slug":"sql%e4%b8%ad%e3%81%aeunion%e3%81%a7%e8%a4%87%e6%95%b0%e3%81%ae%e3%83%86%e3%83%bc%e3%83%96%e3%83%ab%e3%82%92%e7%b5%90%e5%90%88%e3%81%99%e3%82%8b%e9%9a%9b%e3%80%81%e5%88%97%e6%95%b0%e3%81%8c%e4%b8%80","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/sql%e4%b8%ad%e3%81%aeunion%e3%81%a7%e8%a4%87%e6%95%b0%e3%81%ae%e3%83%86%e3%83%bc%e3%83%96%e3%83%ab%e3%82%92%e7%b5%90%e5%90%88%e3%81%99%e3%82%8b%e9%9a%9b%e3%80%81%e5%88%97%e6%95%b0%e3%81%8c%e4%b8%80\/","title":{"rendered":"SQL\u4e2d\u306eUNION\u3067\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u969b\u3001\u5217\u6570\u304c\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u3067\u3059\u304b\uff1f"},"content":{"rendered":"

\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u6570\u304c\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u3001\u5217\u6570\u3092\u5408\u308f\u305b\u308b\u305f\u3081\u306bNULL\u5024\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5177\u4f53\u7684\u306a\u89e3\u6c7a\u65b9\u6cd5\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n

    \n
  1. NULL\u5024\u3092\u624b\u52d5\u3067\u8ffd\u52a0\u3059\u308b\u306b\u306f\u3001SELECT\u6587\u3067\u3001NULL AS \u5217\u540d\u3092\u4f7f\u7528\u3057\u3066NULL\u5024\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/li>\n
  2. \u4f8b\u3048\u3070\u3001A\u3068B\u3068\u3044\u30462\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002A\u306f3\u3064\u306e\u5217\u3001B\u306f2\u3064\u306e\u5217\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u30892\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u3092\u7d50\u5408\u3059\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306eSQL\u6587\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n
  3. tableA\u304b\u3089\u30b3\u30d4\u30fc\u3059\u308b\u5024\u306f\u3001col1\u3001col2\u3001col3\u306e\u307f\u3067\u3001tableB\u304b\u3089\u30b3\u30d4\u30fc\u3059\u308b\u5024\u306fcol1\u3001col2\u3001col4\u3001col5\u306e\u307f\u3067\u3059\u3002<\/li>\n
  4. \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u4f7f\u7528\u3059\u308b\uff1a\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u306b\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001SELECT\u6587\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/li>\n
  5. \u4f8b\u3048\u3070\u3001\u8868A\u3068\u8868B\u304c\u3042\u308b\u3068\u4eee\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002\u8868A\u306b\u306f3\u3064\u306e\u5217\u304c\u3042\u308a\u3001\u8868B\u306b\u306f2\u3064\u306e\u5217\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u30892\u3064\u306e\u8868\u306e\u30c7\u30fc\u30bf\u3092\u30de\u30fc\u30b8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u8868B\u306e3\u5217\u76ee\u306b\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u304c\u3042\u308a\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306f\u300cN\/A\u300d\u3067\u3059\u3002\u4ee5\u4e0b\u306eSQL\u6587\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n
  6. \u30c6\u30fc\u30d6\u30ebA\u304b\u3089\u30ab\u30e9\u30e01\u3001\u30ab\u30e9\u30e02\u3001\u30ab\u30e9\u30e03\u3092\u9078\u629e\u3057\u3001\u30c6\u30fc\u30d6\u30ebB\u304b\u3089\u30ab\u30e9\u30e01\u3001\u30ab\u30e9\u30e02\u3001’N\/A’\u3068\u3057\u3066\u30ab\u30e9\u30e03\u3092\u9078\u629e\u3057\u307e\u3059\u3002<\/li>\n
  7. \u4f7f\u7528\u30a8\u30a4\u30ea\u30a2\u30b9\uff1a2\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u6570\u304c\u4e00\u81f4\u3057\u306a\u3044\u304c\u3001\u540c\u3058\u5217\u540d\u3092\u6301\u3063\u3066\u3044\u308b\u5834\u5408\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u4f7f\u7528\u3057\u3066\u554f\u984c\u3092\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002<\/li>\n
  8. \u305f\u3068\u3048\u3070\u3001\u8868A\u3068\u8868B\u304c\u3042\u308a\u3001\u8868A\u306b\u306f3\u3064\u306e\u5217\u3001\u8868B\u306b\u306f2\u3064\u306e\u5217\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u304c\u3001\u8868A\u306e3\u756a\u76ee\u306e\u5217\u3068\u8868B\u306e2\u756a\u76ee\u306e\u5217\u304c\u540c\u3058\u5217\u540d\u3092\u6301\u3063\u3066\u3044\u308b\u5834\u5408\u3001\u6b21\u306eSQL\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\uff1a<\/li>\n
  9. \u30c6\u30fc\u30d6\u30ebA\u304b\u3089col1\u3001col2\u3001col3\u3092\u9078\u629e\u3057\u3001\u30c6\u30fc\u30d6\u30ebB\u304b\u3089col1\u3001col2\u3001col2\u3092col3\u3068\u3057\u3066\u9078\u629e\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n

    \u4e0a\u8a18\u306f\u4e00\u822c\u7684\u306a3\u3064\u306e\u89e3\u6c7a\u65b9\u6cd5\u3067\u3059\u3002\u5217\u6570\u304c\u4e00\u81f4\u3057\u306a\u3044\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u9069\u5207\u306a\u65b9\u6cd5\u3092\u9078\u629e\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u6570\u304c\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u3001\u5217\u6570\u3092\u5408\u308f\u305b\u308b\u305f\u3081\u306bNULL\u5024\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5177\u4f53\u7684\u306a\u89e3\u6c7a\u65b9\u6cd5\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002 NULL\u5024\u3092\u624b\u52d5\u3067\u8ffd\u52a0\u3059\u308b\u306b\u306f\u3001SELECT\u6587\u3067\u3001NULL AS \u5217\u540d\u3092\u4f7f\u7528\u3057\u3066NULL\u5024 […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-28747","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nSQL\u4e2d\u306eUNION\u3067\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u969b\u3001\u5217\u6570\u304c\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u3067\u3059\u304b\uff1f - 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