{"id":89565,"date":"2024-03-21T11:18:37","date_gmt":"2024-03-21T02:18:37","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%aeconcat%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%ef%bc%9f\/"},"modified":"2024-03-27T21:06:12","modified_gmt":"2024-03-27T12:06:12","slug":"mysql%e3%81%aeconcat%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%aeconcat%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af%ef%bc%9f\/","title":{"rendered":"MySQL\u306econcat\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u306f\uff1f"},"content":{"rendered":"<p>MySQL\u306econcat\u95a2\u6570\u306f\u30012\u3064\u4ee5\u4e0a\u306e\u6587\u5b57\u5217\u3092\u3064\u306a\u3052\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>CONCAT(str1, str2, ...)\r\n<\/code><\/pre>\n<p>\u30b9\u30c8\u30ea\u30f3\u30b0str1\u3001str2\u306a\u3069\u306f\u3001\u9023\u7d50\u3057\u305f\u3044\u6587\u5b57\u5217\u3067\u3059\u3002concat\u95a2\u6570\u306f\u3001\u5f15\u6570\u3092\u3044\u304f\u3064\u3067\u3082\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u30ab\u30f3\u30de\u3067\u533a\u5207\u308a\u307e\u3059\u3002\u5f15\u6570\u306e\u9806\u756a\u901a\u308a\u306b\u9023\u7d50\u3057\u3001\u65b0\u3057\u3044\u6587\u5b57\u5217\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306b concat \u95a2\u6570\u306e\u4ee3\u8868\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> CONCAT(<span class=\"hljs-string\">'Hello'<\/span>, <span class=\"hljs-string\">' '<\/span>, <span class=\"hljs-string\">'World'<\/span>); <span class=\"hljs-comment\">-- \u8f93\u51fa\uff1aHello World<\/span>\r\n\r\n<span class=\"hljs-keyword\">SELECT<\/span> CONCAT(<span class=\"hljs-string\">'Name:'<\/span>, first_name, <span class=\"hljs-string\">' '<\/span>, last_name) <span class=\"hljs-keyword\">AS<\/span> full_name <span class=\"hljs-keyword\">FROM<\/span> users; <span class=\"hljs-comment\">-- \u5c06first_name\u548clast_name\u5b57\u6bb5\u8fde\u63a5\u4e3afull_name\u5b57\u6bb5<\/span>\r\n\r\n<span class=\"hljs-keyword\">SELECT<\/span> CONCAT(<span class=\"hljs-string\">'User ID:'<\/span>, id, <span class=\"hljs-string\">' Email:'<\/span>, email) <span class=\"hljs-keyword\">AS<\/span> user_info <span class=\"hljs-keyword\">FROM<\/span> users; <span class=\"hljs-comment\">-- \u5c06id\u548cemail\u5b57\u6bb5\u8fde\u63a5\u4e3auser_info\u5b57\u6bb5<\/span>\r\n\r\n<span class=\"hljs-keyword\">SELECT<\/span> CONCAT(<span class=\"hljs-string\">'The result is: '<\/span>, <span class=\"hljs-number\">3<\/span> <span class=\"hljs-operator\">+<\/span> <span class=\"hljs-number\">5<\/span>); <span class=\"hljs-comment\">-- \u8f93\u51fa\uff1aThe result is: 8<\/span>\r\n<\/code><\/pre>\n<p>\u3044\u305a\u308c\u304b\u306e\u5f15\u6570\u304c NULL \u3067\u3042\u308b\u5834\u5408\u3001concat \u95a2\u6570\u306e\u7d50\u679c\u306f NULL \u306b\u306a\u308b\u306e\u3067\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u5834\u5408\u3001MySQL \u306e IFNULL \u95a2\u6570\u307e\u305f\u306f COALESCE \u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u51e6\u7406\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL\u306econcat\u95a2\u6570\u306f\u30012\u3064\u4ee5\u4e0a\u306e\u6587\u5b57\u5217\u3092\u3064\u306a\u3052\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002 CONCAT(str1, str2, &#8230;) \u30b9\u30c8\u30ea\u30f3\u30b0str1\u3001str2\u306a\u3069\u306f\u3001\u9023\u7d50\u3057\u305f\u3044\u6587\u5b57\u5217\u3067\u3059\u3002concat\u95a2 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-89565","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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