{"id":120696,"date":"2024-03-23T23:27:31","date_gmt":"2024-03-23T14:27:31","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/sql%e3%81%a7%e3%83%95%e3%82%a3%e3%83%bc%e3%83%ab%e3%83%89%e5%80%a4%e3%82%92-null-%e3%81%ab%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/"},"modified":"2024-03-28T00:49:12","modified_gmt":"2024-03-27T15:49:12","slug":"sql%e3%81%a7%e3%83%95%e3%82%a3%e3%83%bc%e3%83%ab%e3%83%89%e5%80%a4%e3%82%92-null-%e3%81%ab%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/sql%e3%81%a7%e3%83%95%e3%82%a3%e3%83%bc%e3%83%ab%e3%83%89%e5%80%a4%e3%82%92-null-%e3%81%ab%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/","title":{"rendered":"SQL\u3067\u30d5\u30a3\u30fc\u30eb\u30c9\u5024\u3092 NULL \u306b\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"

SQL \u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u3092 NULL \u306b\u3059\u308b\u306b\u306f\u3001\u6b21\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

    \n
  1. INSERT\u6587\u306b\u304a\u3044\u3066NULL\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u3092NULL\u306b\u8a2d\u5b9a\u3059\u308b\u3002\u4f8b\uff1a<\/li>\n<\/ol>\n
    INSERT<\/span> INTO<\/span> table_name (column1, column2, column3) VALUES<\/span> (value1, NULL<\/span>, value3);\r\n<\/code><\/pre>\n
      \n
    1. UPDATE\u6587\u3067NULL\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30ab\u30e9\u30e0\u306e\u5024\u3092NULL\u306b\u3059\u308b\u3002\u4f8b\uff1a<\/li>\n<\/ol>\n
      UPDATE<\/span> table_name SET<\/span> column1 =<\/span> value1, column2 =<\/span> NULL<\/span> WHERE<\/span> condition<\/span>;\r\n<\/code><\/pre>\n
        \n
      1. CREATE TABLE\u6587\u3067NULL\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u304cNULL\u5024\u3092\u683c\u7d0d\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u305f\u3068\u3048\u3070\uff1a<\/li>\n<\/ol>\n
        CREATE<\/span> TABLE<\/span> table_name (\r\ncolumn1 datatype NULL<\/span>,\r\ncolumn2 datatype NOT<\/span> NULL<\/span>,\r\n...\r\n);\r\n<\/code><\/pre>\n
          \n
        1. ALTER TABLE \u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u5185\u3067\u306f\u3001ALTER COLUMN \u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u304c NULL \u5024\u3092\u683c\u7d0d\u3067\u304d\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002\u4f8b:<\/li>\n<\/ol>\n
          ALTER<\/span> TABLE<\/span> table_name ALTER<\/span> COLUMN<\/span> column_name datatype NULL<\/span>;\r\n<\/code><\/pre>\n
          \u6ce8\u610f\uff1a\u591a\u304f\u306e\u5834\u5408\u3001SQL \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306f NULL \u3067\u3042\u308a\u3001CREATE TABLE \u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3067 NOT NULL \u5236\u7d04\u3092\u6307\u5b9a\u3057\u306a\u3044\u9650\u308a NULL \u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
          SQL \u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u3092 NULL \u306b\u3059\u308b\u306b\u306f\u3001\u6b21\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002 INSERT\u6587\u306b\u304a\u3044\u3066NULL\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u3092NULL\u306b\u8a2d\u5b9a\u3059\u308b\u3002\u4f8b\uff1a INSERT INTO table_name (colum […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-120696","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nSQL\u3067\u30d5\u30a3\u30fc\u30eb\u30c9\u5024\u3092 NULL \u306b\u3059\u308b\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\/sql\u3067\u30d5\u30a3\u30fc\u30eb\u30c9\u5024\u3092-null-\u306b\u3059\u308b\u65b9\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL\u3067\u30d5\u30a3\u30fc\u30eb\u30c9\u5024\u3092 NULL \u306b\u3059\u308b\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"SQL \u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u3092 NULL \u306b\u3059\u308b\u306b\u306f\u3001\u6b21\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002 INSERT\u6587\u306b\u304a\u3044\u3066NULL\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5024\u3092NULL\u306b\u8a2d\u5b9a\u3059\u308b\u3002\u4f8b\uff1a INSERT INTO table_name (colum […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/sql\u3067\u30d5\u30a3\u30fc\u30eb\u30c9\u5024\u3092-null-\u306b\u3059\u308b\u65b9\u6cd5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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