{"id":120643,"date":"2024-03-23T23:14:14","date_gmt":"2024-03-23T14:14:14","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/"},"modified":"2024-03-27T14:42:28","modified_gmt":"2024-03-27T05:42:28","slug":"sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/","title":{"rendered":"SQL NULL\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b"},"content":{"rendered":"

SQL\u306eNULL\u95a2\u6570\u306f\u3001\u5f0f\u304cNULL\u5024\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u3001\u7d50\u679c\u3092\u8fd4\u3057\u307e\u3059\u3002\u4f7f\u7528\u65b9\u6cd5\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u30021. COALESCE\u95a2\u6570: COALESCE\u95a2\u6570\u306f\u8907\u6570\u306e\u5f15\u6570\u3092\u53d7\u3051\u4ed8\u3051\u3001\u6700\u521d\u306e\u5f15\u6570\u304cNULL\u3067\u306a\u3044\u5834\u5408\u306f\u3001\u305d\u306e\u5f15\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f\u3001\u6700\u521d\u306eNULL\u3067\u306a\u3044\u5f15\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002\u4f8b:
\n“`
\nSELECT COALESCE(column_name, ‘default_value’) FROM table_name;
\n“`
\ncolumn_name\u304cNULL\u3067\u306a\u3044\u5834\u5408\u306f\u3001column_name\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f\u3001\u300cdefault_value\u300d\u3092\u8fd4\u3057\u307e\u3059\u30022. IS NULL\u95a2\u6570: IS NULL\u95a2\u6570\u306f\u3001\u5f0f\u304cNULL\u5024\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002\u4f8b:
\n“`
\nSELECT column_name FROM table_name WHERE column_name IS NULL;
\n“`
\ncolumn_name\u304cNULL\u306e\u5834\u5408\u3001\u305d\u306e\u884c\u306ecolumn_name\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u30023. IS NOT NULL\u95a2\u6570: IS NOT NULL\u95a2\u6570\u306f\u3001\u5f0f\u304cNULL\u5024\u3067\u306a\u3044\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002\u4f8b:
\n“`
\nSELECT column_name FROM table_name WHERE column_name IS NOT NULL;
\n“`
\ncolumn_name\u304cNULL\u3067\u306a\u3044\u5834\u5408\u306f\u3001\u305d\u306e\u884c\u306ecolumn_name\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u95a2\u6570\u306fSQL\u3067NULL\u5024\u3092\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3001\u5f0f\u306eNULL\u5224\u5b9a\u3084\u5bfe\u5fdc\u3059\u308b\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

SQL\u306eNULL\u95a2\u6570\u306f\u3001\u5f0f\u304cNULL\u5024\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u3001\u7d50\u679c\u3092\u8fd4\u3057\u307e\u3059\u3002\u4f7f\u7528\u65b9\u6cd5\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u30021. COALESCE\u95a2\u6570: COALESCE\u95a2\u6570\u306f\u8907\u6570\u306e\u5f15\u6570\u3092\u53d7\u3051\u4ed8\u3051\u3001\u6700\u521d\u306e\u5f15\u6570\u304cNULL\u3067\u306a\u3044\u5834\u5408\u306f\u3001\u305d\u306e\u5f15\u6570\u3092\u8fd4\u3057 […]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-120643","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nSQL NULL\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b - 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-null\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL NULL\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b\" \/>\n<meta property=\"og:description\" content=\"SQL\u306eNULL\u95a2\u6570\u306f\u3001\u5f0f\u304cNULL\u5024\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u3001\u7d50\u679c\u3092\u8fd4\u3057\u307e\u3059\u3002\u4f7f\u7528\u65b9\u6cd5\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u30021. COALESCE\u95a2\u6570: COALESCE\u95a2\u6570\u306f\u8907\u6570\u306e\u5f15\u6570\u3092\u53d7\u3051\u4ed8\u3051\u3001\u6700\u521d\u306e\u5f15\u6570\u304cNULL\u3067\u306a\u3044\u5834\u5408\u306f\u3001\u305d\u306e\u5f15\u6570\u3092\u8fd4\u3057 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/sql-null\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-23T14:14:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-27T05:42:28+00:00\" \/>\n<meta name=\"author\" content=\"\u590f\u6a39, \u98a8\" \/>\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=\"\u590f\u6a39, \u98a8\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/\",\"url\":\"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/\",\"name\":\"SQL NULL\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b - Blog - Silicon Cloud\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#website\"},\"datePublished\":\"2024-03-23T14:14:14+00:00\",\"dateModified\":\"2024-03-27T05:42:28+00:00\",\"author\":{\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/4e591db2661c4cc425470b461259391d\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/#breadcrumb\"},\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.silicloud.com\/ja\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"SQL NULL\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b\"}]},{\"@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\/4e591db2661c4cc425470b461259391d\",\"name\":\"\u590f\u6a39, \u98a8\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/65e0ff40534461b1fa000382dc194e1716f793ab0bcb218ac3c40895551a08c5?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/65e0ff40534461b1fa000382dc194e1716f793ab0bcb218ac3c40895551a08c5?s=96&d=mm&r=g\",\"caption\":\"\u590f\u6a39, \u98a8\"},\"url\":\"https:\/\/www.silicloud.com\/ja\/blog\/author\/natsukikaze\/\"},{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/#local-main-organization-logo\",\"url\":\"\",\"contentUrl\":\"\",\"caption\":\"Blog - Silicon Cloud\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"SQL NULL\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b - 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\/sql-null\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b\/","og_locale":"ja_JP","og_type":"article","og_title":"SQL NULL\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b","og_description":"SQL\u306eNULL\u95a2\u6570\u306f\u3001\u5f0f\u304cNULL\u5024\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u3001\u7d50\u679c\u3092\u8fd4\u3057\u307e\u3059\u3002\u4f7f\u7528\u65b9\u6cd5\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u30021. COALESCE\u95a2\u6570: COALESCE\u95a2\u6570\u306f\u8907\u6570\u306e\u5f15\u6570\u3092\u53d7\u3051\u4ed8\u3051\u3001\u6700\u521d\u306e\u5f15\u6570\u304cNULL\u3067\u306a\u3044\u5834\u5408\u306f\u3001\u305d\u306e\u5f15\u6570\u3092\u8fd4\u3057 […]","og_url":"https:\/\/www.silicloud.com\/ja\/blog\/sql-null\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b\/","og_site_name":"Blog - Silicon Cloud","article_published_time":"2024-03-23T14:14:14+00:00","article_modified_time":"2024-03-27T05:42:28+00:00","author":"\u590f\u6a39, \u98a8","twitter_card":"summary_large_image","twitter_misc":{"\u57f7\u7b46\u8005":"\u590f\u6a39, \u98a8"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/","url":"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/","name":"SQL NULL\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b - Blog - Silicon Cloud","isPartOf":{"@id":"https:\/\/www.silicloud.com\/ja\/blog\/#website"},"datePublished":"2024-03-23T14:14:14+00:00","dateModified":"2024-03-27T05:42:28+00:00","author":{"@id":"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/4e591db2661c4cc425470b461259391d"},"breadcrumb":{"@id":"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/#breadcrumb"},"inLanguage":"ja","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.silicloud.com\/ja\/blog\/"},{"@type":"ListItem","position":2,"name":"SQL NULL\u95a2\u6570\u306e\u6a5f\u80fd\u306f\u4f55\u304b"}]},{"@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\/4e591db2661c4cc425470b461259391d","name":"\u590f\u6a39, \u98a8","image":{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/65e0ff40534461b1fa000382dc194e1716f793ab0bcb218ac3c40895551a08c5?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/65e0ff40534461b1fa000382dc194e1716f793ab0bcb218ac3c40895551a08c5?s=96&d=mm&r=g","caption":"\u590f\u6a39, \u98a8"},"url":"https:\/\/www.silicloud.com\/ja\/blog\/author\/natsukikaze\/"},{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/www.silicloud.com\/ja\/blog\/sql-null%e9%96%a2%e6%95%b0%e3%81%ae%e6%a9%9f%e8%83%bd%e3%81%af%e4%bd%95%e3%81%8b\/#local-main-organization-logo","url":"","contentUrl":"","caption":"Blog - Silicon Cloud"}]}},"_links":{"self":[{"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/posts\/120643","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\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/comments?post=120643"}],"version-history":[{"count":2,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/posts\/120643\/revisions"}],"predecessor-version":[{"id":190619,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/posts\/120643\/revisions\/190619"}],"wp:attachment":[{"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/media?parent=120643"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/categories?post=120643"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/tags?post=120643"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}