{"id":106,"date":"2023-11-17T12:31:00","date_gmt":"2023-11-17T04:31:00","guid":{"rendered":"http:\/\/www.cmd137blog.top\/?p=106"},"modified":"2024-04-01T12:33:49","modified_gmt":"2024-04-01T04:33:49","slug":"sql-%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%af%a2-%e5%a4%96%e8%bf%9e%e6%8e%a5%ef%bc%88%e5%b7%a6%e5%a4%96%e8%bf%9e%e6%8e%a5%e4%b8%8e%e5%8f%b3%e5%a4%96%e8%bf%9e%e6%8e%a5%ef%bc%89","status":"publish","type":"post","link":"http:\/\/www.cmd137blog.top\/?p=106","title":{"rendered":"SQL-\u591a\u8868\u67e5\u8be2-\u5916\u8fde\u63a5\uff08\u5de6\u5916\u8fde\u63a5\u4e0e\u53f3\u5916\u8fde\u63a5\uff09"},"content":{"rendered":"\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u524d\u8a00<\/h1>\n\n\n\n<p>\u5728 SQL \u4e2d\uff0c\u8fde\u63a5\uff08join\uff09\u901a\u5e38\u6307\u7684\u662f\u5c06\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u6309\u7167\u67d0\u4e9b\u6761\u4ef6\u7ed3\u5408\u8d77\u6765\uff0c\u751f\u6210\u4e00\u4e2a\u66f4\u5927\u7684\u8868\u3002\u8fde\u63a5\u53ef\u4ee5\u5206\u4e3a\u5185\u8fde\u63a5\u3001\u5916\u8fde\u63a5\u548c\u4ea4\u53c9\u8fde\u63a5\u3002<\/p>\n\n\n\n<p>\u5916\u8fde\u63a5\u53c8\u5206\u4e3a\u5de6\u5916\u8fde\u63a5\u548c\u53f3\u5916\u8fde\u63a5\uff0c\u5b83\u4eec\u7684\u533a\u522b\u5728\u4e8e\u8fde\u63a5\u7684\u65b9\u5411\u4e0d\u540c\u3002\u672c\u7bc7\u6587\u7ae0\u5c06\u8be6\u7ec6\u8bb2\u89e3 SQL \u7684\u5916\u8fde\u63a5\uff0c\u5305\u62ec\u5de6\u5916\u8fde\u63a5\u548c\u53f3\u5916\u8fde\u63a5\uff0c\u4ee5\u53ca\u5b83\u4eec\u7684\u5e94\u7528\u573a\u666f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u4e00\u3001\u5916\u8fde\u63a5\u662f\u4ec0\u4e48\uff1f<\/h1>\n\n\n\n<p>\u5916\u8fde\u63a5\uff08Outer Join\uff09\u662f\u4e00\u79cd SQL JOIN \u64cd\u4f5c\uff0c\u5b83\u5141\u8bb8\u4ece\u4e00\u4e2a\u8868\u4e2d\u9009\u62e9\u6240\u6709\u7684\u8bb0\u5f55\uff0c\u800c\u65e0\u8bba\u662f\u5426\u5728\u53e6\u4e00\u4e2a\u8868\u4e2d\u6709\u5339\u914d\u7684\u8bb0\u5f55\u3002\u5982\u679c\u8bb0\u5f55\u5728\u53e6\u4e00\u4e2a\u8868\u4e2d\u6ca1\u6709\u5339\u914d\uff0c\u90a3\u4e48\u7ed3\u679c\u96c6\u4e2d\u7684\u503c\u5c06\u4e3a NULL\u3002<\/p>\n\n\n\n<p>\u901a\u4fd7\u6765\u8bb2\uff0c\u5916\u8fde\u63a5\u53ef\u4ee5\u5c06\u4e24\u4e2a\u8868\u4e2d\u7b26\u5408\u6761\u4ef6\u7684\u8bb0\u5f55\u8fde\u63a5\u5728\u4e00\u8d77\uff0c\u540c\u65f6\u4fdd\u7559\u4e86\u5176\u4e2d\u4e00\u4e2a\u8868\u4e2d\u672a\u7b26\u5408\u6761\u4ef6\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u5916\u8fde\u63a5\u5e38\u7528\u4e8e\u9700\u8981\u663e\u793a\u67d0\u4e9b\u6570\u636e\uff0c\u4f46\u67d0\u4e9b\u4fe1\u606f\u53ef\u80fd\u4e0d\u5b58\u5728\u7684\u573a\u666f\u4e2d\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u4e8c\u3001\u4f7f\u7528\u6b65\u9aa4<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">1.\u5de6\u5916\u8fde\u63a5<\/h2>\n\n\n\n<p>\u67e5\u8be2\u5de6\u8868\u6240\u6709\u6570\u636e\uff0c\u4ee5\u53ca\u4e24\u5f20\u8868\u4ea4\u96c6\u90e8\u5206\u6570\u636e<br><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.cmd137blog.top\/wp-content\/uploads\/2024\/04\/9dfc6a0028274f6ebccd2fc1b1fc2b22.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"797\" height=\"271\" data-original=\"http:\/\/www.cmd137blog.top\/wp-content\/uploads\/2024\/04\/9dfc6a0028274f6ebccd2fc1b1fc2b22.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-107\"  sizes=\"auto, (max-width: 797px) 100vw, 797px\" \/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<pre class=\"wp-block-code\"><code>SELECT \u5b57\u6bb5\u5217\u8868 FROM \u88681 LEFT OUTER JOIN \u88682 ON \u6761\u4ef6...\uff1b<\/code><\/pre>\n<\/blockquote>\n\n\n\n<p>\u76f8\u5f53\u4e8e\u67e5\u8be2\u88681\u7684\u6240\u6709\u6570\u636e\uff0c\u5305\u542b\u88681\u548c\u88682\u4ea4\u96c6\u90e8\u5206\u6570\u636e<br>\u5de6\u5916\u8fde\u63a5\uff08Left Outer Join\uff09\u662f\u6700\u5e38\u7528\u7684\u5916\u8fde\u63a5\u4e4b\u4e00\u3002\u5b83\u53ef\u4ee5\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\u548c\u53f3\u8868\u4e2d\u90a3\u4e9b\u5339\u914d\u5de6\u8868\u4e2d\u503c\u7684\u884c\uff0c\u5e76\u4e14\u5982\u679c\u8fd9\u4e9b\u884c\u4e0d\u5b58\u5728\u5339\u914d\uff0c\u5219\u4f1a\u5728\u7ed3\u679c\u96c6\u4e2d\u4f7f\u7528 NULL \u503c\u586b\u5145\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b SQL \u662f\u4e00\u4e2a\u5de6\u5916\u8fde\u63a5\u7684\u793a\u4f8b\uff0c\u5b83\u4f1a\u8fd4\u56de customers \u8868\u4e2d\u7684\u6240\u6709\u5ba2\u6237\u4ee5\u53ca orders \u8868\u4e2d\u5339\u914d\u7684\u8ba2\u5355\u3002\u5982\u679c\u67d0\u4e2a\u5ba2\u6237\u672a\u4e0b\u8fc7\u8ba2\u5355\uff0c\u5219\u8ba2\u5355\u5b57\u6bb5\u4f1a\u7528 NULL \u503c\u586b\u5145\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT *\nFROM customers\nLEFT JOIN orders\nON customers.id = orders.customer_id;<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8ff0 SQL \u8bed\u53e5\u4e2d\uff0cLEFT JOIN \u8868\u793a\u5de6\u5916\u8fde\u63a5\uff0c\u5c06 customers \u8868\u548c orders \u8868\u8fde\u63a5\u5728\u4e00\u8d77\uff0c\u540c\u65f6\u4fdd\u7559 customers \u8868\u4e2d\u7684\u6240\u6709\u884c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.\u53f3\u5916\u8fde\u63a5<\/h2>\n\n\n\n<p>\u67e5\u8be2\u53f3\u8868\u6240\u6709\u6570\u636e\uff0c\u4ee5\u53ca\u4e24\u5f20\u8868\u4ea4\u96c6\u90e8\u5206\u6570\u636e<br><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.cmd137blog.top\/wp-content\/uploads\/2024\/04\/e29800cfc6e3442e806aa091ad7aee9d.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"797\" height=\"271\" data-original=\"http:\/\/www.cmd137blog.top\/wp-content\/uploads\/2024\/04\/e29800cfc6e3442e806aa091ad7aee9d.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-108\"  sizes=\"auto, (max-width: 797px) 100vw, 797px\" \/><\/div><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<pre class=\"wp-block-code\"><code>SELECT \u5b57\u6bb5\u5217\u8868 FROM \u88681 RIGHT OUTER JOIN \u88682 ON \u6761\u4ef6\u2026\uff1b<\/code><\/pre>\n<\/blockquote>\n\n\n\n<p>\u53f3\u5916\u8fde\u63a5\uff08Right Outer Join\uff09\u662f\u5de6\u5916\u8fde\u63a5\u7684\u53cd\u5411\u64cd\u4f5c\u3002\u5b83\u4f1a\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\u548c\u5de6\u8868\u4e2d\u5339\u914d\u7684\u884c\uff0c\u5e76\u4e14\u5982\u679c\u8fd9\u4e9b\u884c\u4e0d\u5b58\u5728\u5339\u914d\uff0c\u5219\u4f1a\u5728\u7ed3\u679c\u96c6\u4e2d\u4f7f\u7528 NULL \u503c\u586b\u5145\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b SQL \u662f\u4e00\u4e2a\u53f3\u5916\u8fde\u63a5\u7684\u793a\u4f8b\uff0c\u5b83\u4f1a\u8fd4\u56de orders \u8868\u4e2d\u7684\u6240\u6709\u8ba2\u5355\u4ee5\u53ca customers \u8868\u4e2d\u5339\u914d\u7684\u5ba2\u6237\u3002\u5982\u679c\u67d0\u4e2a\u8ba2\u5355\u672a\u88ab\u5ba2\u6237\u5339\u914d\uff0c\u5219\u5ba2\u6237\u5b57\u6bb5\u4f1a\u7528 NULL \u503c\u586b\u5145\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT *\nFROM customers\nRIGHT JOIN orders\nON customers.id = orders.customer_id;<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8ff0 SQL \u8bed\u53e5\u4e2d\uff0cRIGHT JOIN \u8868\u793a\u53f3\u5916\u8fde\u63a5\uff0c\u5c06 customers \u8868\u548c orders \u8868\u8fde\u63a5\u5728\u4e00\u8d77\uff0c\u540c\u65f6\u4fdd\u7559 orders \u8868\u4e2d\u7684\u6240\u6709\u884c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3.\u5de6\u5916\u8fde\u63a5\u4e0e\u53f3\u5916\u8fde\u63a5\u7684\u533a\u522b\u3001\u5171\u540c\u70b9\uff1a<\/h2>\n\n\n\n<p><strong>\u533a\u522b\uff1a<\/strong><br>\u65b9\u5411\u4e0d\u540c\uff1a\u5de6\u5916\u8fde\u63a5\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\u548c\u53f3\u8868\u4e2d\u5339\u914d\u7684\u884c\uff0c\u53f3\u5916\u8fde\u63a5\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\u548c\u5de6\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<br>\u7ed3\u679c\u96c6\u4e2d\u7684 NULL \u503c\u4f4d\u7f6e\u4e0d\u540c\uff1a\u5728\u5de6\u5916\u8fde\u63a5\u4e2d\uff0c\u5982\u679c\u53f3\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u884c\uff0c\u5bf9\u5e94\u7684\u5b57\u6bb5\u503c\u4f1a\u88ab\u586b\u5145\u4e3a NULL\uff1b\u5728\u53f3\u5916\u8fde\u63a5\u4e2d\uff0c\u5982\u679c\u5de6\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u884c\uff0c\u5bf9\u5e94\u7684\u5b57\u6bb5\u503c\u4f1a\u88ab\u586b\u5145\u4e3a NULL\u3002<\/p>\n\n\n\n<p><strong>\u5171\u540c\u70b9\uff1a<\/strong><br>\u4fdd\u7559\u4e86\u5de6\u8868\u548c\u53f3\u8868\u4e2d\u7684\u6240\u6709\u6570\u636e\uff1a\u65e0\u8bba\u662f\u5de6\u5916\u8fde\u63a5\u8fd8\u662f\u53f3\u5916\u8fde\u63a5\uff0c\u90fd\u4f1a\u4fdd\u7559\u5de6\u8868\u548c\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u53ea\u662f\u5bf9\u4e8e\u5339\u914d\u4e0d\u4e0a\u7684\u8bb0\u5f55\u9700\u8981\u586b\u5145 NULL \u503c\u3002<br>\u4f7f\u7528 ON 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