{"id":25208,"date":"2024-03-17T03:52:06","date_gmt":"2024-03-16T18:52:06","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/"},"modified":"2024-03-22T10:57:25","modified_gmt":"2024-03-22T01:57:25","slug":"mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/","title":{"rendered":"mysql\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"

MySQL\u306b\u304a\u3044\u3066\u3001IFNULL\u95a2\u6570\u306f\u7279\u5b9a\u306e\u5024\u3092\u8fd4\u3059\u3053\u3068\u3092\u6761\u4ef6\u3068\u3057\u3066\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u304cNULL\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002NULL\u3067\u3042\u308c\u3070\u6307\u5b9a\u3055\u308c\u305f\u5024\u3092\u8fd4\u3057\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u30d5\u30a3\u30fc\u30eb\u30c9\u81ea\u4f53\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n

\u6761\u4ef6\u5f0f\uff1a
\nIFNULL(expr1, expr2)<\/p>\n

\u8aac\u660e\uff1a<\/p>\n

    \n
  1. expr1: NULL\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u5fc5\u8981\u306e\u3042\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u3084\u5f0f\u3002<\/li>\n
  2. expr1\u304cNULL\u306e\u5834\u5408\u3001\u8fd4\u3055\u308c\u308b\u5024\u3002<\/li>\n<\/ol>\n

    \u4f8b\u3048\u3070\u3001”\u751f\u5f92” \u3068\u3044\u3046\u540d\u524d\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308b\u3068\u4eee\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u306e\u4e2d\u306b\u306f\u3001”id”\u3001”\u540d\u524d”\u3001”\u5e74\u9f62”\u3068\u3044\u3046\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n

      \n
    1. \u751f\u5f92\u30c6\u30fc\u30d6\u30eb\u304b\u3089age\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u8fd4\u3059\u969b\u3001\u3082\u3057age\u304cNULL\u3067\u3042\u308c\u3070\u30010\u3092\u8fd4\u3059\uff1a
      \nSELECT IFNULL(age, 0) FROM students;<\/li>\n
    2. \u5b66\u751f\u306e\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u3001\u540d\u524d\u6b04\u3092\u53d6\u5f97\u3057\u3001\u3082\u3057\u540d\u524d\u304cNULL\u306e\u5834\u5408\u306f\u2019Unknown\u2019\u3068\u8868\u793a\u3059\u308b\u3002<\/li>\n<\/ol>\n

      \u6ce8\u610f\u70b9:<\/p>\n

        \n
      1. IFNULL\u95a2\u6570\u306f2\u3064\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u306e\u307f\u53d7\u3051\u5165\u308c\u307e\u3059\u30022\u3064\u3092\u8d85\u3048\u308b\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u306f\u53d7\u3051\u4ed8\u3051\u307e\u305b\u3093\u3002<\/li>\n
      2. \u6700\u521d\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u306f\u30d5\u30a3\u30fc\u30eb\u30c9\u540d\u3001\u5f0f\u3001\u307e\u305f\u306f\u5b9a\u6570\u306e\u3044\u305a\u308c\u304b\u3067\u3042\u3063\u3066\u3082\u3088\u3044\u304c\u30012\u756a\u76ee\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u306f\u5b9a\u6570\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

        MySQL\u306b\u304a\u3044\u3066\u3001IFNULL\u95a2\u6570\u306f\u7279\u5b9a\u306e\u5024\u3092\u8fd4\u3059\u3053\u3068\u3092\u6761\u4ef6\u3068\u3057\u3066\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u304cNULL\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002NULL\u3067\u3042\u308c\u3070\u6307\u5b9a\u3055\u308c\u305f\u5024\u3092\u8fd4\u3057\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u30d5\u30a3\u30fc\u30eb\u30c9\u81ea\u4f53\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002 \u6761\u4ef6\u5f0f\uff1a IFNUL […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-25208","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nmysql\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f - 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\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"mysql\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f\" \/>\n<meta property=\"og:description\" content=\"MySQL\u306b\u304a\u3044\u3066\u3001IFNULL\u95a2\u6570\u306f\u7279\u5b9a\u306e\u5024\u3092\u8fd4\u3059\u3053\u3068\u3092\u6761\u4ef6\u3068\u3057\u3066\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u304cNULL\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002NULL\u3067\u3042\u308c\u3070\u6307\u5b9a\u3055\u308c\u305f\u5024\u3092\u8fd4\u3057\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u30d5\u30a3\u30fc\u30eb\u30c9\u81ea\u4f53\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002 \u6761\u4ef6\u5f0f\uff1a IFNUL […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/mysql\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T18:52:06+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T01:57:25+00:00\" \/>\n<meta name=\"author\" content=\"\u7dbe\u4e43, \u4e00\u5e0c\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u7dbe\u4e43, \u4e00\u5e0c\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/\",\"url\":\"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/\",\"name\":\"mysql\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon Cloud\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#website\"},\"datePublished\":\"2024-03-16T18:52:06+00:00\",\"dateModified\":\"2024-03-22T01:57:25+00:00\",\"author\":{\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/601389077b7f4e4ad6115428e3b73bff\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/#breadcrumb\"},\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.silicloud.com\/ja\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"mysql\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#website\",\"url\":\"https:\/\/www.silicloud.com\/ja\/blog\/\",\"name\":\"Blog - Silicon Cloud\",\"description\":\"\",\"inLanguage\":\"ja\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/601389077b7f4e4ad6115428e3b73bff\",\"name\":\"\u7dbe\u4e43, \u4e00\u5e0c\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/2228fe98b71141214fb24fb1b5ae44f99bdfa0602bbd89b351f2acd49ece862d?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/2228fe98b71141214fb24fb1b5ae44f99bdfa0602bbd89b351f2acd49ece862d?s=96&d=mm&r=g\",\"caption\":\"\u7dbe\u4e43, \u4e00\u5e0c\"},\"url\":\"https:\/\/www.silicloud.com\/ja\/blog\/author\/ayanokazuki\/\"},{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/#local-main-organization-logo\",\"url\":\"\",\"contentUrl\":\"\",\"caption\":\"Blog - Silicon Cloud\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"mysql\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon Cloud","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.silicloud.com\/ja\/blog\/mysql\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f\/","og_locale":"ja_JP","og_type":"article","og_title":"mysql\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f","og_description":"MySQL\u306b\u304a\u3044\u3066\u3001IFNULL\u95a2\u6570\u306f\u7279\u5b9a\u306e\u5024\u3092\u8fd4\u3059\u3053\u3068\u3092\u6761\u4ef6\u3068\u3057\u3066\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u304cNULL\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002NULL\u3067\u3042\u308c\u3070\u6307\u5b9a\u3055\u308c\u305f\u5024\u3092\u8fd4\u3057\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u30d5\u30a3\u30fc\u30eb\u30c9\u81ea\u4f53\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002 \u6761\u4ef6\u5f0f\uff1a IFNUL […]","og_url":"https:\/\/www.silicloud.com\/ja\/blog\/mysql\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f\/","og_site_name":"Blog - Silicon Cloud","article_published_time":"2024-03-16T18:52:06+00:00","article_modified_time":"2024-03-22T01:57:25+00:00","author":"\u7dbe\u4e43, \u4e00\u5e0c","twitter_card":"summary_large_image","twitter_misc":{"\u57f7\u7b46\u8005":"\u7dbe\u4e43, \u4e00\u5e0c"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/","url":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/","name":"mysql\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon Cloud","isPartOf":{"@id":"https:\/\/www.silicloud.com\/ja\/blog\/#website"},"datePublished":"2024-03-16T18:52:06+00:00","dateModified":"2024-03-22T01:57:25+00:00","author":{"@id":"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/601389077b7f4e4ad6115428e3b73bff"},"breadcrumb":{"@id":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/#breadcrumb"},"inLanguage":"ja","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.silicloud.com\/ja\/blog\/"},{"@type":"ListItem","position":2,"name":"mysql\u3067\u306eifnull\u306e\u4f7f\u3044\u65b9\u306f\u4f55\u3067\u3059\u304b\uff1f"}]},{"@type":"WebSite","@id":"https:\/\/www.silicloud.com\/ja\/blog\/#website","url":"https:\/\/www.silicloud.com\/ja\/blog\/","name":"Blog - Silicon Cloud","description":"","inLanguage":"ja"},{"@type":"Person","@id":"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/601389077b7f4e4ad6115428e3b73bff","name":"\u7dbe\u4e43, \u4e00\u5e0c","image":{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/2228fe98b71141214fb24fb1b5ae44f99bdfa0602bbd89b351f2acd49ece862d?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/2228fe98b71141214fb24fb1b5ae44f99bdfa0602bbd89b351f2acd49ece862d?s=96&d=mm&r=g","caption":"\u7dbe\u4e43, \u4e00\u5e0c"},"url":"https:\/\/www.silicloud.com\/ja\/blog\/author\/ayanokazuki\/"},{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%a7%e3%81%aeifnull%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/#local-main-organization-logo","url":"","contentUrl":"","caption":"Blog - Silicon Cloud"}]}},"_links":{"self":[{"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/posts\/25208","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/comments?post=25208"}],"version-history":[{"count":2,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/posts\/25208\/revisions"}],"predecessor-version":[{"id":106246,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/posts\/25208\/revisions\/106246"}],"wp:attachment":[{"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/media?parent=25208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/categories?post=25208"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/tags?post=25208"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}