{"id":15540,"date":"2023-12-04T20:37:06","date_gmt":"2023-12-04T12:37:06","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=15540"},"modified":"2023-12-04T20:37:48","modified_gmt":"2023-12-04T12:37:48","slug":"oracle-zhong-nei-lian-jie-zuo-lian-jie-you-lian-ji","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/oracle-zhong-nei-lian-jie-zuo-lian-jie-you-lian-ji\/","title":{"rendered":"Oracle \u4e2d\u5185\u8fde\u63a5\uff0c\u5de6\u8fde\u63a5\uff0c\u53f3\u8fde\u63a5\u7684\u533a\u522b\uff1f"},"content":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u8fde\u63a5\uff08Joins\uff09\u662f\u7528\u4e8e\u8054\u7ed3\u591a\u4e2a\u8868\u4ee5\u83b7\u53d6\u76f8\u5173\u6570\u636e\u7684\u65b9\u6cd5\u3002\u4e3b\u8981\u7684\u8fde\u63a5\u7c7b\u578b\u5305\u62ec\u5185\u8fde\u63a5\u3001\u5de6\u8fde\u63a5\u548c\u53f3\u8fde\u63a5\uff0c\u5b83\u4eec\u4e4b\u95f4\u7684\u533a\u522b\u5728\u4e8e\u5339\u914d\u548c\u8fd4\u56de\u7ed3\u679c\u7684\u65b9\u5f0f\uff1a<\/p>\n<ol>\n<li><strong>\u5185\u8fde\u63a5\uff08Inner Join\uff09<\/strong>\uff1a\n<ul>\n<li>\u5185\u8fde\u63a5\u8fd4\u56de\u4e24\u4e2a\u8868\u4e2d\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u4ea4\u96c6\u90e8\u5206\uff0c\u5373\u53ea\u8fd4\u56de\u4e24\u4e2a\u8868\u4e2d\u5171\u540c\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u884c\u3002<\/li>\n<li>\u5982\u679c\u6ca1\u6709\u5339\u914d\u7684\u884c\uff0c\u5219\u4e0d\u4f1a\u88ab\u8fd4\u56de\u3002<\/li>\n<li>\u5185\u8fde\u63a5\u4f7f\u7528 <code>INNER JOIN<\/code> \u6216\u8005\u7b80\u5199\u7684 <code>JOIN<\/code> \u5173\u952e\u5b57\u6765\u6267\u884c\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-sql  line-numbers\">SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column;\n<\/code><\/pre>\n<\/li>\n<li><strong>\u5de6\u8fde\u63a5\uff08Left Join\uff09<\/strong>\uff1a\n<ul>\n<li>\u5de6\u8fde\u63a5\u8fd4\u56de\u5de6\u8fb9\u8868\uff08\u7b2c\u4e00\u4e2a\u8868\uff09\u4e2d\u6240\u6709\u7684\u884c\uff0c\u4ee5\u53ca\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u53f3\u8fb9\u8868\uff08\u7b2c\u4e8c\u4e2a\u8868\uff09\u4e2d\u7684\u5339\u914d\u884c\u3002<\/li>\n<li>\u5982\u679c\u53f3\u8fb9\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u884c\uff0c\u5219\u8fd4\u56de NULL \u503c\u3002<\/li>\n<li>\u5de6\u8fde\u63a5\u4f7f\u7528 <code>LEFT JOIN<\/code> \u5173\u952e\u5b57\u6765\u6267\u884c\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-sql  line-numbers\">SELECT * FROM table1 LEFT JOIN table2 ON table1.column = table2.column;\n<\/code><\/pre>\n<\/li>\n<li><strong>\u53f3\u8fde\u63a5\uff08Right Join\uff09<\/strong>\uff1a\n<ul>\n<li>\u53f3\u8fde\u63a5\u8fd4\u56de\u53f3\u8fb9\u8868\u4e2d\u6240\u6709\u7684\u884c\uff0c\u4ee5\u53ca\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u5de6\u8fb9\u8868\u4e2d\u7684\u5339\u914d\u884c\u3002<\/li>\n<li>\u5982\u679c\u5de6\u8fb9\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u884c\uff0c\u5219\u8fd4\u56de NULL \u503c\u3002<\/li>\n<li>\u53f3\u8fde\u63a5\u4f7f\u7528 <code>RIGHT JOIN<\/code> \u5173\u952e\u5b57\u6765\u6267\u884c\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-sql  line-numbers\">SELECT * FROM table1 RIGHT JOIN table2 ON table1.column = table2.column;\n<\/code><\/pre>\n<\/li>\n<\/ol>\n<p>\u8fd9\u4e9b\u8fde\u63a5\u7c7b\u578b\u5141\u8bb8\u5728\u591a\u4e2a\u8868\u4e4b\u95f4\u6267\u884c\u8054\u7ed3\u64cd\u4f5c\uff0c\u6839\u636e\u4e0d\u540c\u7684\u9700\u6c42\u8fd4\u56de\u5339\u914d\u7684\u6570\u636e\u3002\u9009\u62e9\u5408\u9002\u7684\u8fde\u63a5\u7c7b\u578b\u53d6\u51b3\u4e8e\u4f60\u60f3\u8981\u7684\u7ed3\u679c\u96c6\uff0c\u4ee5\u53ca\u5bf9\u6570\u636e\u7684\u9700\u6c42\u548c\u5339\u914d\u89c4\u5219\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u8fde\u63a5\uff08Joins\uff09\u662f\u7528\u4e8e\u8054\u7ed3\u591a\u4e2a\u8868\u4ee5\u83b7\u53d6\u76f8\u5173\u6570\u636e\u7684\u65b9\u6cd5\u3002\u4e3b\u8981\u7684\u8fde\u63a5\u7c7b\u578b\u5305\u62ec\u5185\u8fde\u63a5\u3001\u5de6\u8fde\u63a5 [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-15540","post","type-post","status-publish","format-standard","hentry","category-oracel"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15540","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=15540"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15540\/revisions"}],"predecessor-version":[{"id":15541,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15540\/revisions\/15541"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=15540"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=15540"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=15540"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}