{"id":87426,"date":"2024-03-21T08:23:41","date_gmt":"2024-03-20T23:23:41","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8bleft-join%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%a8%e3%81%af\/"},"modified":"2024-03-27T12:13:29","modified_gmt":"2024-03-27T03:13:29","slug":"mysql%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8bleft-join%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%a8%e3%81%af","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8bleft-join%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%a8%e3%81%af\/","title":{"rendered":"MySQL\u306b\u304a\u3051\u308bLEFT JOIN\u306e\u4f7f\u3044\u65b9\u3068\u306f?"},"content":{"rendered":"<p>MySQL\u3067LEFT JOIN\u306f\u30012\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3057\u3001\u5de6\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u3059\u3079\u3066\u306e\u884c\u3068\u3001\u53f3\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u4e00\u81f4\u3059\u308b\u884c\u3092\u8fd4\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002LEFT JOIN\u306f\u3001\u4e21\u65b9\u306e\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066\u7d50\u5408\u3055\u308c\u3001\u901a\u5e38\u306f\u4e21\u65b9\u306e\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u5916\u90e8\u30ad\u30fc\u95a2\u4fc2\u3067\u3059\u3002<\/p>\n<p>\u6587\u6cd5\u306f\u6b21\u306e\u3068\u304a\u308a\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> \u5217\u540d <span class=\"hljs-keyword\">FROM<\/span> \u8868A\r\n<span class=\"hljs-keyword\">LEFT<\/span> <span class=\"hljs-keyword\">JOIN<\/span> \u8868B <span class=\"hljs-keyword\">ON<\/span> \u8868A.\u5217\u540d <span class=\"hljs-operator\">=<\/span> \u8868B.\u5217\u540d;\r\n<\/code><\/pre>\n<p>A\u8868\u304c\u5de6\u306e\u8868\u3067\u3001B\u8868\u304c\u53f3\u306e\u8868\u3067\u3001\u5217\u540d\u304c2\u3064\u306e\u8868\u3092\u3064\u306a\u3050\u6761\u4ef6\u3067\u3059\u3002<\/p>\n<p>LEFT JOIN\u3067\u306f\u3001\u5de6\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u3059\u3079\u3066\u306e\u884c\u3092\u9078\u629e\u3057\u3001\u5404\u884c\u306b\u3064\u3044\u3066\u53f3\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u4e00\u81f4\u3059\u308b\u884c\u3092\u63a2\u3057\u307e\u3059\u3002\u4e00\u81f4\u3059\u308b\u884c\u304c\u53f3\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306f\u3001NULL\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u306f\u3001Order\uff08\u6ce8\u6587\uff09\u30c6\u30fc\u30d6\u30eb\u3068Customer\uff08\u9867\u5ba2\uff09\u30c6\u30fc\u30d6\u30eb\u306e\u5916\u63a5\u30ad\u30fc\u306e\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u30b7\u30c3\u30d7\u306b\u3064\u3044\u3066\u3001\u30b5\u30f3\u30d7\u30eb\u30921\u3064\u793a\u3057\u307e\u3059\u3002<\/p>\n<p>\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\uff08\u30aa\u30fc\u30c0\u30fc\uff09<\/p>\n<pre class=\"post-pre\"><code>order_id | customer_id | order_date\r\n-----------------------------------\r\n1        | 1           | 2022-01-01\r\n2        | 2           | 2022-02-01\r\n3        | 1           | 2022-03-01\r\n<\/code><\/pre>\n<p>\u9867\u5ba2\u30c6\u30fc\u30d6\u30eb<\/p>\n<pre class=\"post-pre\"><code>customer_id | customer_name\r\n---------------------------\r\n1           | Alice\r\n2           | Bob\r\n3           | Charlie\r\n<\/code><\/pre>\n<p>customer_id\u3092\u7167\u5408\u3057\u3066\u3001\u6ce8\u6587\u60c5\u5831\u3068\u9867\u5ba2\u60c5\u5831\u3092JOIN\u3067\u53d6\u5f97\u3067\u304d\u307e\u3059\uff08\u4e00\u81f4\u3059\u308b\u5834\u5408\u306e\u307f\uff09\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> order_id, order_date, customer_name\r\n<span class=\"hljs-keyword\">FROM<\/span> <span class=\"hljs-keyword\">order<\/span>\r\n<span class=\"hljs-keyword\">LEFT<\/span> <span class=\"hljs-keyword\">JOIN<\/span> customer <span class=\"hljs-keyword\">ON<\/span> order.customer_id <span class=\"hljs-operator\">=<\/span> customer.customer_id;\r\n<\/code><\/pre>\n<p>\u691c\u7d22\u7d50\u679c:<\/p>\n<pre class=\"post-pre\"><code>order_id | order_date  | customer_name\r\n-------------------------------------\r\n1        | 2022-01-01  | Alice\r\n2        | 2022-02-01  | Bob\r\n3        | 2022-03-01  | Alice\r\n<\/code><\/pre>\n<p>LEFT JOIN\u3067\u306f\u3001\u53f3\u30c6\u30fc\u30d6\u30eb\u306e\u3042\u308b1\u884c\u304c\u5de6\u30c6\u30fc\u30d6\u30eb\u306e\u8907\u6570\u306e\u884c\u3068\u30de\u30c3\u30c1\u3059\u308b\u5834\u5408\u3001\u8907\u6570\u306e\u884c\u7d50\u679c\u304c\u8fd4\u3055\u308c\u308b\u3053\u3068\u306b\u6ce8\u610f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL\u3067LEFT JOIN\u306f\u30012\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3057\u3001\u5de6\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u3059\u3079\u3066\u306e\u884c\u3068\u3001\u53f3\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u4e00\u81f4\u3059\u308b\u884c\u3092\u8fd4\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002LEFT JOIN\u306f\u3001\u4e21\u65b9\u306e\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066\u7d50\u5408\u3055\u308c\u3001\u901a\u5e38\u306f\u4e21\u65b9 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-87426","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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