{"id":23816,"date":"2024-03-16T23:29:38","date_gmt":"2024-03-16T14:29:38","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%ae%e6%97%a5%e4%bb%98%e5%bd%a2%e5%bc%8f%e5%a4%89%e6%8f%9b%e3%81%8c%e3%81%86%e3%81%be%e3%81%8f%e3%81%84%e3%81%8b%e3%81%aa%e3%81%84%e5%a0%b4%e5%90%88%e3%80%81%e3%81%a9%e3%81%86%e3%81%99\/"},"modified":"2025-08-07T17:36:12","modified_gmt":"2025-08-07T08:36:12","slug":"mysql%e3%81%ae%e6%97%a5%e4%bb%98%e5%bd%a2%e5%bc%8f%e5%a4%89%e6%8f%9b%e3%81%8c%e3%81%86%e3%81%be%e3%81%8f%e3%81%84%e3%81%8b%e3%81%aa%e3%81%84%e5%a0%b4%e5%90%88%e3%80%81%e3%81%a9%e3%81%86%e3%81%99","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%ae%e6%97%a5%e4%bb%98%e5%bd%a2%e5%bc%8f%e5%a4%89%e6%8f%9b%e3%81%8c%e3%81%86%e3%81%be%e3%81%8f%e3%81%84%e3%81%8b%e3%81%aa%e3%81%84%e5%a0%b4%e5%90%88%e3%80%81%e3%81%a9%e3%81%86%e3%81%99\/","title":{"rendered":"mysql\u306e\u65e5\u4ed8\u5f62\u5f0f\u5909\u63db\u304c\u3046\u307e\u304f\u3044\u304b\u306a\u3044\u5834\u5408\u3001\u3069\u3046\u3059\u308c\u3070\u89e3\u6c7a\u3067\u304d\u307e\u3059\u304b\uff1f"},"content":{"rendered":"<p>MySQL\u3067\u65e5\u4ed8\u5f62\u5f0f\u306e\u5909\u63db\u306b\u5931\u6557\u3059\u308b\u539f\u56e0\u3068\u89e3\u6c7a\u65b9\u6cd5\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\uff1a<\/p>\n<ol>\n<li>\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u304c\u7121\u52b9\u3067\u3059\uff1aMySQL\u304c\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u6a19\u6e96\u306e\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff08YYYY-MM-DD\u307e\u305f\u306fYYYY-MM-DD HH:MM:SS\uff09\u306b\u5408\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u304c\u6b63\u3057\u304f\u306a\u3044\u5834\u5408\u306f\u3001STR_TO_DATE\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u5909\u63db\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>A man is known by the company he keeps.<\/p>\n<p>Japanese: \u4eba\u306f\u4ed8\u304d\u5408\u3046\u4ef2\u9593\u3067\u5224\u65ad\u3055\u308c\u308b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> STR_TO_DATE(<span class=\"hljs-string\">'2021\/01\/01'<\/span>, <span class=\"hljs-string\">'%Y\/%m\/%d'<\/span>); <span class=\"hljs-comment\">-- \u5c06\u65e5\u671f\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f\u683c\u5f0f\uff08YYYY\/MM\/DD\uff09<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>\u6587\u5b57\u5217\u3068\u65e5\u4ed8\u578b\u304c\u4e00\u81f4\u3057\u307e\u305b\u3093\uff1a\u6587\u5b57\u5217\u3092\u65e5\u4ed8\u578b\u306b\u5909\u63db\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u6587\u5b57\u5217\u3092\u5f15\u7528\u7b26\u3084\u4e8c\u91cd\u5f15\u7528\u7b26\u3067\u56f2\u3093\u3067\u3001MySQL\u304c\u6587\u5b57\u5217\u3068\u8a8d\u8b58\u3059\u308b\u3088\u3046\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001DATE\u3084STR_TO_DATE\u306a\u3069\u306e\u65e5\u4ed8\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u3001\u6587\u5b57\u5217\u3092\u65e5\u4ed8\u578b\u306b\u5909\u63db\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u5f7c\u5973\u306f\u3068\u3066\u3082\u89aa\u5207\u3067\u3001\u3044\u3064\u3082\u8ab0\u304b\u3092\u52a9\u3051\u3088\u3046\u3068\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> <span class=\"hljs-type\">DATE<\/span>(<span class=\"hljs-string\">'2021-01-01'<\/span>); <span class=\"hljs-comment\">-- \u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f\u7c7b\u578b<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3068\u30d5\u30a3\u30fc\u30eb\u30c9\u30bf\u30a4\u30d7\u304c\u4e00\u81f4\u3057\u307e\u305b\u3093\uff1a\u65e5\u4ed8\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u7570\u306a\u308b\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u30d5\u30a3\u30fc\u30eb\u30c9\u30bf\u30a4\u30d7\u304c\u5909\u63db\u5f8c\u306e\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u4e00\u81f4\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30bf\u30fc\u30b2\u30c3\u30c8\u30d5\u30a3\u30fc\u30eb\u30c9\u30bf\u30a4\u30d7\u304cDATE\u3067\u3042\u308b\u5834\u5408\u3001\u65e5\u4ed8\u90e8\u5206\u306e\u307f\u8868\u793a\u3055\u308c\u307e\u3059\u3002datetimedatetime\u3082\u3057\u304f\u306f\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3067\u3042\u308b\u5834\u5408\u306f\u3001\u65e5\u4ed8\u304a\u3088\u3073\u6642\u523b\u90e8\u5206\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u4f8b\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> DATE_FORMAT(<span class=\"hljs-string\">'2021-01-01'<\/span>, <span class=\"hljs-string\">'%Y-%m-%d'<\/span>); <span class=\"hljs-comment\">-- \u5c06\u65e5\u671f\u5b57\u6bb5\u8f6c\u6362\u4e3a\u6307\u5b9a\u7684\u65e5\u671f\u683c\u5f0f<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>\u65e5\u4ed8\u30c7\u30fc\u30bf\u304c\u7a7a\u307e\u305f\u306f\u7121\u52b9\u3067\u3059\uff1a\u65e5\u4ed8\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u7a7a\u3067\u3042\u308b\u304b\u7121\u52b9\u306a\u5834\u5408\u3001\u65e5\u4ed8\u5f62\u5f0f\u306e\u5909\u63db\u304c\u5931\u6557\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u65e5\u4ed8\u3092\u5909\u63db\u3059\u308b\u524d\u306b\u3001ISNULL\u3084COALESCE\u306a\u3069\u306e\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u65e5\u4ed8\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u3001\u9069\u5207\u306a\u51e6\u7406\u65b9\u6cd5\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u4f8b:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> <span class=\"hljs-built_in\">COALESCE<\/span>(DATE_FORMAT(date_field, <span class=\"hljs-string\">'%Y-%m-%d'<\/span>), <span class=\"hljs-string\">'N\/A'<\/span>) <span class=\"hljs-keyword\">AS<\/span> formatted_date <span class=\"hljs-comment\">-- \u5982\u679c\u65e5\u671f\u4e3a\u7a7a\uff0c\u5219\u663e\u793a\"N\/A\"<\/span>\r\n<span class=\"hljs-keyword\">FROM<\/span> table_name;\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u65b9\u6cd5\u3092\u4f7f\u3048\u3070\u3001MySQL\u306e\u65e5\u4ed8\u5f62\u5f0f\u306e\u5909\u63db\u306b\u5931\u6557\u3057\u305f\u554f\u984c\u3092\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002\u5177\u4f53\u7684\u306a\u72b6\u6cc1\u306b\u5408\u308f\u305b\u3066\u9069\u5207\u306a\u89e3\u6c7a\u7b56\u3092\u9078\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL\u3067\u65e5\u4ed8\u5f62\u5f0f\u306e\u5909\u63db\u306b\u5931\u6557\u3059\u308b\u539f\u56e0\u3068\u89e3\u6c7a\u65b9\u6cd5\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\uff1a \u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u304c\u7121\u52b9\u3067\u3059\uff1aMySQL\u304c\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u6a19\u6e96\u306e\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff08YYYY-MM-DD\u307e\u305f\u306fYYYY-MM-DD HH:MM: [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-23816","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>mysql\u306e\u65e5\u4ed8\u5f62\u5f0f\u5909\u63db\u304c\u3046\u307e\u304f\u3044\u304b\u306a\u3044\u5834\u5408\u3001\u3069\u3046\u3059\u308c\u3070\u89e3\u6c7a\u3067\u304d\u307e\u3059\u304b\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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