{"id":217775,"date":"2023-12-23T00:03:32","date_gmt":"2023-12-22T16:03:32","guid":{"rendered":"https:\/\/www.idc.net\/help\/217775\/"},"modified":"2023-12-23T00:03:32","modified_gmt":"2023-12-22T16:03:32","slug":"mysql%e4%bd%bf%e7%94%a8%e6%89%8b%e5%86%8c%ef%bc%9a%e4%bd%bf%e7%94%a8join%e5%85%b3%e9%94%ae%e5%ad%97%e5%9f%ba%e4%ba%8e%e7%9b%b8%e5%85%b3%e5%88%97%e5%90%88%e5%b9%b6%e4%b8%a4%e4%b8%aa%e6%88%96%e5%a4%9a","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/217775\/","title":{"rendered":"MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528JOIN\u5173\u952e\u5b57\u57fa\u4e8e\u76f8\u5173\u5217\u5408\u5e76\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u884c"},"content":{"rendered":"<p><title id=\"mysql%e4%bd%bf%e7%94%a8%e6%89%8b%e5%86%8c%ef%bc%9a%e4%bd%bf%e7%94%a8join%e5%85%b3%e9%94%ae%e5%ad%97%e5%9f%ba%e4%ba%8e%e7%9b%b8%e5%85%b3%e5%88%97%e5%90%88%e5%b9%b6%e4%b8%a4%e4%b8%aa%e6%88%96%e5%a4%9a-qopTMaAOzb\">MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528JOIN\u5173\u952e\u5b57\u57fa\u4e8e\u76f8\u5173\u5217\u5408\u5e76\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u884c<\/title><\/p>\n<h1 id=\"mysql%e4%bd%bf%e7%94%a8%e6%89%8b%e5%86%8c%ef%bc%9a%e4%bd%bf%e7%94%a8join%e5%85%b3%e9%94%ae%e5%ad%97%e5%9f%ba%e4%ba%8e%e7%9b%b8%e5%85%b3%e5%88%97%e5%90%88%e5%b9%b6%e4%b8%a4%e4%b8%aa%e6%88%96%e5%a4%9a-qopTMaAOzb\">MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528JOIN\u5173\u952e\u5b57\u57fa\u4e8e\u76f8\u5173\u5217\u5408\u5e76\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u884c<\/h1>\n<p>\u5728MySQL\u4e2d\uff0cJOIN\u5173\u952e\u5b57\u662f\u4e00\u79cd\u7528\u4e8e\u5408\u5e76\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u884c\u7684\u65b9\u6cd5\u3002\u901a\u8fc7\u4f7f\u7528JOIN\uff0c\u53ef\u4ee5\u6839\u636e\u76f8\u5173\u5217\u5c06\u591a\u4e2a\u8868\u4e2d\u7684\u884c\u5408\u5e76\u5728\u4e00\u8d77\uff0c\u4ece\u800c\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u6240\u6709\u76f8\u5173\u6570\u636e\u7684\u7ed3\u679c\u96c6\u3002<\/p>\n<h2 id=\"inner-join-qopTMaAOzb\">INNER JOIN<\/h2>\n<p>INNER JOIN\u662f\u6700\u5e38\u7528\u7684JOIN\u7c7b\u578b\u4e4b\u4e00\u3002\u5b83\u8fd4\u56de\u4e24\u4e2a\u8868\u4e2d\u76f8\u5173\u884c\u7684\u4ea4\u96c6\u3002\u4f7f\u7528INNER JOIN\u65f6\uff0c\u53ea\u6709\u5728\u8fde\u63a5\u6761\u4ef6\u5339\u914d\u7684\u60c5\u51b5\u4e0b\uff0c\u624d\u4f1a\u8fd4\u56de\u7ed3\u679c\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528INNER JOIN\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT Orders.OrderID, Customers.CustomerName\nFROM Orders\nINNER JOIN Customers\nON Orders.CustomerID = Customers.CustomerID;<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06Orders\u8868\u548cCustomers\u8868\u8fde\u63a5\u5728\u4e00\u8d77\u3002\u8fde\u63a5\u6761\u4ef6\u662fOrders\u8868\u7684CustomerID\u5217\u7b49\u4e8eCustomers\u8868\u7684CustomerID\u5217\u3002\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u5176\u4e2d\u5305\u542bOrderID\u548cCustomerName\u5217\u3002<\/p>\n<h2 id=\"left-join-qopTMaAOzb\">LEFT JOIN<\/h2>\n<p>LEFT JOIN\u662f\u53e6\u4e00\u79cd\u5e38\u7528\u7684JOIN\u7c7b\u578b\u3002\u5b83\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u4ee5\u53ca\u53f3\u8868\u4e2d\u4e0e\u5de6\u8868\u76f8\u5173\u7684\u884c\u3002\u5982\u679c\u53f3\u8868\u4e2d\u6ca1\u6709\u4e0e\u5de6\u8868\u76f8\u5173\u7684\u884c\uff0c\u5219\u8fd4\u56deNULL\u503c\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528LEFT JOIN\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT Customers.CustomerName, Orders.OrderID\nFROM Customers\nLEFT JOIN Orders\nON Customers.CustomerID = Orders.CustomerID;<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06Customers\u8868\u548cOrders\u8868\u8fde\u63a5\u5728\u4e00\u8d77\u3002\u8fde\u63a5\u6761\u4ef6\u662fCustomers\u8868\u7684CustomerID\u5217\u7b49\u4e8eOrders\u8868\u7684CustomerID\u5217\u3002\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u5176\u4e2d\u5305\u542bCustomerName\u548cOrderID\u5217\u3002<\/p>\n<h2 id=\"right-join-qopTMaAOzb\">RIGHT JOIN<\/h2>\n<p>RIGHT JOIN\u662fLEFT JOIN\u7684\u53cd\u5411\u64cd\u4f5c\u3002\u5b83\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u4ee5\u53ca\u5de6\u8868\u4e2d\u4e0e\u53f3\u8868\u76f8\u5173\u7684\u884c\u3002\u5982\u679c\u5de6\u8868\u4e2d\u6ca1\u6709\u4e0e\u53f3\u8868\u76f8\u5173\u7684\u884c\uff0c\u5219\u8fd4\u56deNULL\u503c\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528RIGHT JOIN\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT Customers.CustomerName, Orders.OrderID\nFROM Customers\nRIGHT JOIN Orders\nON Customers.CustomerID = Orders.CustomerID;<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06Customers\u8868\u548cOrders\u8868\u8fde\u63a5\u5728\u4e00\u8d77\u3002\u8fde\u63a5\u6761\u4ef6\u662fCustomers\u8868\u7684CustomerID\u5217\u7b49\u4e8eOrders\u8868\u7684CustomerID\u5217\u3002\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u5176\u4e2d\u5305\u542bCustomerName\u548cOrderID\u5217\u3002<\/p>\n<h2 id=\"full-join-qopTMaAOzb\">FULL JOIN<\/h2>\n<p>FULL JOIN\u662fLEFT JOIN\u548cRIGHT JOIN\u7684\u7ec4\u5408\u3002\u5b83\u8fd4\u56de\u5de6\u8868\u548c\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5e76\u5c06\u5b83\u4eec\u5408\u5e76\u5728\u4e00\u8d77\u3002\u5982\u679c\u5de6\u8868\u6216\u53f3\u8868\u4e2d\u6ca1\u6709\u4e0e\u53e6\u4e00\u4e2a\u8868\u76f8\u5173\u7684\u884c\uff0c\u5219\u8fd4\u56deNULL\u503c\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528FULL JOIN\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT Customers.CustomerName, Orders.OrderID\nFROM Customers\nFULL JOIN Orders\nON Customers.CustomerID = Orders.CustomerID;<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06Customers\u8868\u548cOrders\u8868\u8fde\u63a5\u5728\u4e00\u8d77\u3002\u8fde\u63a5\u6761\u4ef6\u662fCustomers\u8868\u7684CustomerID\u5217\u7b49\u4e8eOrders\u8868\u7684CustomerID\u5217\u3002\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u5176\u4e2d\u5305\u542bCustomerName\u548cOrderID\u5217\u3002<\/p>\n<h2 id=\"%e6%80%bb%e7%bb%93-qopTMaAOzb\">\u603b\u7ed3<\/h2>\n<p>\u4f7f\u7528JOIN\u5173\u952e\u5b57\u53ef\u4ee5\u57fa\u4e8e\u76f8\u5173\u5217\u5408\u5e76\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u884c\u3002INNER JOIN\u8fd4\u56de\u4e24\u4e2a\u8868\u4e2d\u76f8\u5173\u884c\u7684\u4ea4\u96c6\uff0cLEFT JOIN\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\u4ee5\u53ca\u4e0e\u5de6\u8868\u76f8\u5173\u7684\u53f3\u8868\u884c\uff0cRIGHT JOIN\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\u4ee5\u53ca\u4e0e\u53f3\u8868\u76f8\u5173\u7684\u5de6\u8868\u884c\uff0cFULL JOIN\u8fd4\u56de\u5de6\u8868\u548c\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5bfb\u627e\u53ef\u9760\u7684\u4e91\u8ba1\u7b97\u670d\u52a1\u63d0\u4f9b\u5546\uff0c\u540e\u6d6a\u4e91\u662f\u60a8\u7684\u9996\u9009\u3002\u6211\u4eec\u63d0\u4f9b\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u548c\u4e91\u670d\u52a1\u5668\u7b49\u591a\u79cd\u4ea7\u54c1\u3002\u8bf7\u8bbf\u95ee\u6211\u4eec\u7684\u5b98\u7f51\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\uff1a<a href=\"https:\/\/idc.net\">https:\/\/idc.net<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528JOIN\u5173\u952e\u5b57\u57fa\u4e8e\u76f8\u5173\u5217\u5408\u5e76\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u884c MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528JOIN\u5173\u952e\u5b57 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[197851],"tags":[],"class_list":["post-217775","post","type-post","status-publish","format-standard","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/217775","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=217775"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/217775\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=217775"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=217775"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=217775"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}