{"id":15410,"date":"2023-12-04T20:00:54","date_gmt":"2023-12-04T12:00:54","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=15410"},"modified":"2023-12-04T20:02:10","modified_gmt":"2023-12-04T12:02:10","slug":"oracle-zhong-shuo-xia-nei-lian-jie-zuo-lian-jie-yo","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/oracle-zhong-shuo-xia-nei-lian-jie-zuo-lian-jie-yo\/","title":{"rendered":"Oracle \u4e2d\u8bf4\u4e0b\uff0c\u5185\u8fde\u63a5\uff0c\u5de6\u8fde\u63a5\uff0c\u53f3\u8fde\u63a5\u7684\u533a\u522b\uff1f"},"content":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u8fde\u63a5\uff08Join\uff09\u662f\u7528\u4e8e\u8054\u5408\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u7684\u64cd\u4f5c\uff0c\u5e38\u89c1\u7684\u8fde\u63a5\u7c7b\u578b\u5305\u62ec\u5185\u8fde\u63a5\u3001\u5de6\u8fde\u63a5\u548c\u53f3\u8fde\u63a5\uff1a<\/p>\n<ol>\n<li>\n<strong>\u5185\u8fde\u63a5\uff08Inner Join\uff09\uff1a<\/strong><\/p>\n<ul>\n<li>\u5185\u8fde\u63a5\u8fd4\u56de\u4e24\u4e2a\u8868\u4e2d\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u5339\u914d\u884c\uff0c\u5373\u8fd4\u56de\u4e24\u4e2a\u8868\u4e2d\u8fde\u63a5\u5217\u5177\u6709\u5339\u914d\u503c\u7684\u884c\u3002<\/li>\n<li>\u5982\u679c\u4e24\u4e2a\u8868\u4e2d\u8fde\u63a5\u5217\u6ca1\u6709\u5339\u914d\u7684\u503c\uff0c\u8fd9\u4e9b\u884c\u5c06\u4e0d\u4f1a\u88ab\u5305\u542b\u5728\u7ed3\u679c\u96c6\u4e2d\u3002<\/li>\n<li>\u5185\u8fde\u63a5\u4f7f\u7528 <code>INNER JOIN<\/code> \u5173\u952e\u5b57\u8fdb\u884c\u5b9a\u4e49\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>\u5de6\u8fde\u63a5\uff08Left Join \u6216 Left Outer Join\uff09\uff1a<\/strong><\/p>\n<ul>\n<li>\u5de6\u8fde\u63a5\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u4ee5\u53ca\u53f3\u8868\u4e2d\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u5339\u914d\u884c\u3002<\/li>\n<li>\u5982\u679c\u53f3\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u884c\uff0c\u5c06\u8fd4\u56de NULL \u503c\u3002<\/li>\n<li>\u5de6\u8fde\u63a5\u4f7f\u7528 <code>LEFT JOIN<\/code> \u6216 <code>LEFT OUTER JOIN<\/code> \u5173\u952e\u5b57\u8fdb\u884c\u5b9a\u4e49\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>\u53f3\u8fde\u63a5\uff08Right Join \u6216 Right Outer Join\uff09\uff1a<\/strong><\/p>\n<ul>\n<li>\u53f3\u8fde\u63a5\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u4ee5\u53ca\u5de6\u8868\u4e2d\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u5339\u914d\u884c\u3002<\/li>\n<li>\u5982\u679c\u5de6\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u884c\uff0c\u5c06\u8fd4\u56de NULL \u503c\u3002<\/li>\n<li>\u53f3\u8fde\u63a5\u4f7f\u7528 <code>RIGHT JOIN<\/code> \u6216 <code>RIGHT OUTER JOIN<\/code> \u5173\u952e\u5b57\u8fdb\u884c\u5b9a\u4e49\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>\u603b\u7684\u6765\u8bf4\uff0c\u5185\u8fde\u63a5\u8fd4\u56de\u4e24\u4e2a\u8868\u4e2d\u5339\u914d\u7684\u884c\uff0c\u5de6\u8fde\u63a5\u8fd4\u56de\u5de6\u8868\u4e2d\u6240\u6709\u7684\u884c\u4ee5\u53ca\u53f3\u8868\u4e2d\u7684\u5339\u914d\u884c\uff0c\u53f3\u8fde\u63a5\u5219\u8fd4\u56de\u53f3\u8868\u4e2d\u6240\u6709\u7684\u884c\u4ee5\u53ca\u5de6\u8868\u4e2d\u7684\u5339\u914d\u884c\u3002\u8fde\u63a5\u7684\u9009\u62e9\u53d6\u51b3\u4e8e\u6240\u9700\u7684\u6570\u636e\u4ee5\u53ca\u4e1a\u52a1\u903b\u8f91\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u8fde\u63a5\uff08Join\uff09\u662f\u7528\u4e8e\u8054\u5408\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u7684\u64cd\u4f5c\uff0c\u5e38\u89c1\u7684\u8fde\u63a5\u7c7b\u578b\u5305\u62ec\u5185\u8fde\u63a5\u3001\u5de6\u8fde\u63a5\u548c\u53f3\u8fde\u63a5\uff1a [&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-15410","post","type-post","status-publish","format-standard","hentry","category-oracel"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15410","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=15410"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15410\/revisions"}],"predecessor-version":[{"id":15411,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15410\/revisions\/15411"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=15410"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=15410"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=15410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}