{"id":157838,"date":"2024-11-02T23:52:20","date_gmt":"2024-11-02T15:52:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/157838\/"},"modified":"2024-11-02T23:52:21","modified_gmt":"2024-11-02T15:52:21","slug":"%e9%ab%98%e6%95%88%e6%9f%a5%e8%a9%a2%ef%bc%9a%e5%a6%82%e4%bd%95%e9%80%b2%e8%a1%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e9%97%9c%e8%81%af%e6%9f%a5%e8%a9%a2%ef%bc%9f%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%e9%97%9c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/157838\/","title":{"rendered":"\u9ad8\u6548\u67e5\u8a62\uff1a\u5982\u4f55\u9032\u884c\u6578\u64da\u5eab\u95dc\u806f\u67e5\u8a62\uff1f\uff08\u6578\u64da\u5eab\u95dc\u806f\u67e5\u8a62\uff09"},"content":{"rendered":"<h1 id=\"%e9%ab%98%e6%95%88%e6%9f%a5%e8%a9%a2%ef%bc%9a%e5%a6%82%e4%bd%95%e9%80%b2%e8%a1%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e9%97%9c%e8%81%af%e6%9f%a5%e8%a9%a2%ef%bc%9f-IlDvaJXJdB\">\u9ad8\u6548\u67e5\u8a62\uff1a\u5982\u4f55\u9032\u884c\u6578\u64da\u5eab\u95dc\u806f\u67e5\u8a62\uff1f<\/h1>\n<p>\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6578\u64da\u5eab\u662f\u5b58\u5132\u548c\u7ba1\u7406\u6578\u64da\u7684\u6838\u5fc3\u7d44\u4ef6\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u5982\u4f55\u9ad8\u6548\u5730\u67e5\u8a62\u6578\u64da\u6210\u70ba\u4e86\u958b\u767c\u8005\u9762\u81e8\u7684\u4e00\u5927\u6311\u6230\u3002\u7279\u5225\u662f\u7576\u6578\u64da\u5206\u4f48\u5728\u591a\u500b\u8868\u4e2d\u6642\uff0c\u9032\u884c\u95dc\u806f\u67e5\u8a62\u5c31\u986f\u5f97\u5c24\u70ba\u91cd\u8981\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eab\u95dc\u806f\u67e5\u8a62\u7684\u57fa\u672c\u6982\u5ff5\u3001\u985e\u578b\u53ca\u5176\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e9%97%9c%e8%81%af%e6%9f%a5%e8%a9%a2%ef%bc%9f-IlDvaJXJdB\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u95dc\u806f\u67e5\u8a62\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u95dc\u806f\u67e5\u8a62\u662f\u6307\u5728\u95dc\u806f\u6578\u64da\u5eab\u4e2d\uff0c\u901a\u904e\u95dc\u806f\u4e0d\u540c\u7684\u8868\u4f86\u6aa2\u7d22\u6578\u64da\u7684\u904e\u7a0b\u3002\u9019\u7a2e\u67e5\u8a62\u901a\u5e38\u4f7f\u7528 SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u4f86\u5be6\u73fe\u3002\u95dc\u806f\u67e5\u8a62\u7684\u4e3b\u8981\u76ee\u7684\u662f\u5f9e\u591a\u500b\u8868\u4e2d\u63d0\u53d6\u76f8\u95dc\u6578\u64da\uff0c\u4ee5\u4fbf\u9032\u884c\u66f4\u6df1\u5165\u7684\u5206\u6790\u548c\u5831\u544a\u3002<\/p>\n<h2 id=\"%e9%97%9c%e8%81%af%e6%9f%a5%e8%a9%a2%e7%9a%84%e9%a1%9e%e5%9e%8b-IlDvaJXJdB\">\u95dc\u806f\u67e5\u8a62\u7684\u985e\u578b<\/h2>\n<p>\u95dc\u806f\u67e5\u8a62\u4e3b\u8981\u6709\u4ee5\u4e0b\u5e7e\u7a2e\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u5167\u90e8\u806f\u63a5\uff08INNER JOIN\uff09<\/strong>\uff1a\u53ea\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u5916\u90e8\u806f\u63a5\uff08OUTER JOIN\uff09<\/strong>\uff1a\u8fd4\u56de\u81f3\u5c11\u4e00\u500b\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u4e26\u5728\u6c92\u6709\u5339\u914d\u6642\u7528 NULL \u586b\u5145\u3002<\/li>\n<li><strong>\u4ea4\u53c9\u806f\u63a5\uff08CROSS JOIN\uff09<\/strong>\uff1a\u8fd4\u56de\u5169\u500b\u8868\u7684\u7b1b\u5361\u723e\u7a4d\uff0c\u5373\u6bcf\u500b\u8868\u7684\u6bcf\u4e00\u884c\u90fd\u8207\u53e6\u4e00\u500b\u8868\u7684\u6bcf\u4e00\u884c\u76f8\u7d50\u5408\u3002<\/li>\n<li><strong>\u81ea\u806f\u63a5\uff08SELF JOIN\uff09<\/strong>\uff1a\u5c07\u8868\u8207\u81ea\u8eab\u9032\u884c\u806f\u63a5\uff0c\u901a\u5e38\u7528\u65bc\u67e5\u8a62\u5c64\u7d1a\u7d50\u69cb\u6216\u6bd4\u8f03\u540c\u4e00\u8868\u4e2d\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e9%80%b2%e8%a1%8c%e9%97%9c%e8%81%af%e6%9f%a5%e8%a9%a2-IlDvaJXJdB\">\u5982\u4f55\u9032\u884c\u95dc\u806f\u67e5\u8a62<\/h2>\n<p>\u4ee5\u4e0b\u662f\u9032\u884c\u95dc\u806f\u67e5\u8a62\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e7%a2%ba%e5%ae%9a%e6%9f%a5%e8%a9%a2%e9%9c%80%e6%b1%82-IlDvaJXJdB\">1. \u78ba\u5b9a\u67e5\u8a62\u9700\u6c42<\/h3>\n<p>\u9996\u5148\uff0c\u660e\u78ba\u4f60\u9700\u8981\u5f9e\u6578\u64da\u5eab\u4e2d\u7372\u53d6\u54ea\u4e9b\u4fe1\u606f\uff0c\u4ee5\u53ca\u9019\u4e9b\u4fe1\u606f\u5206\u4f48\u5728\u54ea\u4e9b\u8868\u4e2d\u3002<\/p>\n<h3 id=\"2-%e7%90%86%e8%a7%a3%e8%a1%a8%e4%b9%8b%e9%96%93%e7%9a%84%e9%97%9c%e4%bf%82-IlDvaJXJdB\">2. \u7406\u89e3\u8868\u4e4b\u9593\u7684\u95dc\u4fc2<\/h3>\n<p>\u4e86\u89e3\u4e0d\u540c\u8868\u4e4b\u9593\u7684\u95dc\u806f\u6027\uff0c\u4f8b\u5982\u4e3b\u9375\u548c\u5916\u9375\u7684\u95dc\u4fc2\uff0c\u9019\u5c0d\u65bc\u69cb\u5efa\u6709\u6548\u7684\u67e5\u8a62\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h3 id=\"3-%e7%b7%a8%e5%af%ab-sql-%e6%9f%a5%e8%a9%a2-IlDvaJXJdB\">3. \u7de8\u5beb SQL \u67e5\u8a62<\/h3>\n<p>\u4f7f\u7528 SQL \u8a9e\u53e5\u4f86\u7de8\u5beb\u67e5\u8a62\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u4f8b\u5b50\uff0c\u5047\u8a2d\u6709\u5169\u500b\u8868\uff1a<code>customers<\/code> \u548c <code>orders<\/code>\uff0c\u6211\u5011\u5e0c\u671b\u67e5\u8a62\u6bcf\u4f4d\u5ba2\u6236\u53ca\u5176\u8a02\u55ae\u4fe1\u606f\uff1a<\/p>\n<pre><code>SELECT customers.name, orders.order_date\nFROM customers\nINNER JOIN orders ON customers.id = orders.customer_id;<\/code><\/pre>\n<h3 id=\"4-%e6%b8%ac%e8%a9%a6%e5%92%8c%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2-IlDvaJXJdB\">4. \u6e2c\u8a66\u548c\u512a\u5316\u67e5\u8a62<\/h3>\n<p>\u57f7\u884c\u67e5\u8a62\u4e26\u6aa2\u67e5\u7d50\u679c\u662f\u5426\u7b26\u5408\u9810\u671f\u3002\u5982\u679c\u67e5\u8a62\u901f\u5ea6\u8f03\u6162\uff0c\u53ef\u4ee5\u8003\u616e\u6dfb\u52a0\u7d22\u5f15\u6216\u91cd\u69cb\u67e5\u8a62\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-IlDvaJXJdB\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u9032\u884c\u6578\u64da\u5eab\u95dc\u806f\u67e5\u8a62\u6642\uff0c\u9075\u5faa\u4ee5\u4e0b\u6700\u4f73\u5be6\u8e10\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u7d22\u5f15<\/strong>\uff1a\u70ba\u7d93\u5e38\u67e5\u8a62\u7684\u5217\u6dfb\u52a0\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\u3002<\/li>\n<li><strong>\u907f\u514d\u9078\u64c7\u904e\u591a\u7684\u5217<\/strong>\uff1a\u53ea\u9078\u64c7\u5fc5\u8981\u7684\u5217\uff0c\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf\u3002<\/li>\n<li><strong>\u4f7f\u7528\u9069\u7576\u7684\u806f\u63a5\u985e\u578b<\/strong>\uff1a\u6839\u64da\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u806f\u63a5\u985e\u578b\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u8655\u7406\u3002<\/li>\n<li><strong>\u5b9a\u671f\u512a\u5316\u6578\u64da\u5eab<\/strong>\uff1a\u5b9a\u671f\u9032\u884c\u6578\u64da\u5eab\u7dad\u8b77\u548c\u512a\u5316\uff0c\u4ee5\u4fdd\u6301\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-IlDvaJXJdB\">\u7e3d\u7d50<\/h2>\n<p>\u6578\u64da\u5eab\u95dc\u806f\u67e5\u8a62\u662f\u6578\u64da\u7ba1\u7406\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\uff0c\u638c\u63e1\u5176\u57fa\u672c\u6982\u5ff5\u548c\u6280\u5de7\u5c0d\u65bc\u958b\u767c\u8005\u4f86\u8aaa\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u5408\u7406\u7684\u67e5\u8a62\u8a2d\u8a08\u548c\u512a\u5316\uff0c\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u6548\u7387\u3002\u82e5\u60a8\u9700\u8981\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5feb\u901f\u5b58\u53d6\u548c\u8655\u7406\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u9ad8\u6548\u9032\u884c\u6578\u64da\u5eab\u95dc\u806f\u67e5\u8a62\u7684\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u901f\u5ea6\u8207\u6e96\u78ba\u6027\uff0c\u512a\u5316\u6578\u64da\u7ba1\u7406\u6d41\u7a0b\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-157838","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/157838","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=157838"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/157838\/revisions"}],"predecessor-version":[{"id":157839,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/157838\/revisions\/157839"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=157838"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=157838"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=157838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}