{"id":117588,"date":"2024-03-23T11:00:28","date_gmt":"2024-03-23T02:00:28","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%aeisnull%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95\/"},"modified":"2024-04-04T16:12:51","modified_gmt":"2024-04-04T07:12:51","slug":"mysql%e3%81%aeisnull%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%aeisnull%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95\/","title":{"rendered":"MySQL\u306eisnull\u95a2\u6570\u306e\u4f7f\u7528\u65b9\u6cd5"},"content":{"rendered":"

MySQL\u306eISNULL()\u95a2\u6570\u306f\u3001\u5f0f\u304cNULL\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u3001\u771f\u507d\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002ISNULL()\u95a2\u6570\u306e\u66f8\u5f0f\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n

    \n
  1. ISNULL(\u5f0f)\uff1a\u5f0f\u304cNULL\u304b\u78ba\u8a8d\u3057\u3001NULL\u306e\u5834\u5408\u306f1\u3092\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f0\u3092\u8fd4\u3057\u307e\u3059\u3002<\/li>\n
  2. ISNULL\uff08\u5f0f\u3001\u5024\uff09\uff1a \u5f0f\u304cNULL\u3067\u3042\u308c\u3070\u5024\u3092\u8fd4\u3057\u3001\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f\u5f0f\u81ea\u4f53\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n

    \u4f8b\u3048\u3070\u3001\u9867\u5ba2\u60c5\u5831\u30c6\u30fc\u30d6\u30eb customers \u3092\u8003\u3048\u307e\u3059\u3002\u3053\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u306f\u5217 customer_id \u3068 customer_name \u304c\u3042\u308a\u3001\u4e00\u90e8\u306e\u884c\u306e customer_name \u304c NULL \u306b\u306a\u3063\u3066\u3044\u308b\u3068\u3057\u307e\u3059\u3002\u6b21\u306e\u4f8b\u3067\u306f\u3001ISNULL() \u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u3001\u6b20\u640d\u5024\u3092\u51e6\u7406\u3059\u308b\u65b9\u6cd5\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n

      \n
    1. \u9867\u5ba2ID\u3001\u9867\u5ba2\u540d\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306fNULL\u3092ISNULL\u3067\u6307\u5b9a\u3057\u3066\u9867\u5ba2\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u9078\u629e\u3059\u308b<\/li>\n<\/ol>\n

      customer_id\u3068is_null\u306e2\u3064\u306e\u5217\u304c\u542b\u307e\u308c\u308b\u7d50\u679c\u30bb\u30c3\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002customer_name\u304cNULL\u304b\u3069\u3046\u304b\u3092\u8868\u3059is_null\u5217\u306b\u306f1\u307e\u305f\u306f0\u304c\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n

        \n
      1. SELECT customer_id, ISNULL(customer_name, ‘\u4e0d\u660e’) AS customer_name FROM customers;<\/li>\n<\/ol>\n

        customer_id\u3068customer_name\u306e2\u30ab\u30e9\u30e0\u3092\u542b\u3080\u7d50\u679c\u30bb\u30c3\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002customer_name\u30ab\u30e9\u30e0\u306b\u306fcustomer_name\u306e\u5024\u304c\u542b\u307e\u308c\u3001customer_name\u304cNULL\u306e\u5834\u5408\u306f\u2019N\/A\u2019\u306b\u7f6e\u304d\u63db\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n

        \u306a\u304a\u3001MySQL\u3067\u306fISNULL()\u95a2\u6570\u306f\u975e\u6a19\u6e96\u95a2\u6570\u3067\u3059\u3002MySQL\u3067\u306f\u901a\u5e38\u3001IFNULL()\u95a2\u6570\u3067\u5f0f\u304cNULL\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

        MySQL\u306eISNULL()\u95a2\u6570\u306f\u3001\u5f0f\u304cNULL\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u3001\u771f\u507d\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002ISNULL()\u95a2\u6570\u306e\u66f8\u5f0f\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 ISNULL(\u5f0f)\uff1a\u5f0f\u304cNULL\u304b\u78ba\u8a8d\u3057\u3001NULL\u306e\u5834\u5408\u306f1\u3092\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f0\u3092\u8fd4\u3057\u307e […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-117588","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nMySQL\u306eisnull\u95a2\u6570\u306e\u4f7f\u7528\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/mysql\u306eisnull\u95a2\u6570\u306e\u4f7f\u7528\u65b9\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MySQL\u306eisnull\u95a2\u6570\u306e\u4f7f\u7528\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"MySQL\u306eISNULL()\u95a2\u6570\u306f\u3001\u5f0f\u304cNULL\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u3001\u771f\u507d\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002ISNULL()\u95a2\u6570\u306e\u66f8\u5f0f\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 ISNULL(\u5f0f)\uff1a\u5f0f\u304cNULL\u304b\u78ba\u8a8d\u3057\u3001NULL\u306e\u5834\u5408\u306f1\u3092\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f0\u3092\u8fd4\u3057\u307e […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/mysql\u306eisnull\u95a2\u6570\u306e\u4f7f\u7528\u65b9\u6cd5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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