{"id":15501,"date":"2023-12-04T20:27:26","date_gmt":"2023-12-04T12:27:26","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=15501"},"modified":"2023-12-04T20:27:58","modified_gmt":"2023-12-04T12:27:58","slug":"oracle-zhong-zuo-lian-jie-you-lian-jie-quan-wai-li","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/oracle-zhong-zuo-lian-jie-you-lian-jie-quan-wai-li\/","title":{"rendered":"Oracle \u4e2d\u5de6\u8fde\u63a5\u3001\u53f3\u8fde\u63a5\u3001\u5168\u5916\u8fde\u63a5\u4ee5\u53ca(+)\u53f7\u7684\u6ce8\u610f\u4e8b\u9879\uff1f"},"content":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u5de6\u8fde\u63a5\u3001\u53f3\u8fde\u63a5\u3001\u5168\u5916\u8fde\u63a5\u548c (+) \u7b26\u53f7\u662f\u7528\u4e8e\u6267\u884c\u4e0d\u540c\u7c7b\u578b\u8fde\u63a5\u7684\u65b9\u5f0f\uff0c\u5b83\u4eec\u6709\u4e00\u4e9b\u6ce8\u610f\u4e8b\u9879\uff1a<\/p>\n<ol>\n<li><strong>\u5de6\u8fde\u63a5\uff08LEFT JOIN\uff09<\/strong>\uff1a\n<ul>\n<li>\u5de6\u8fde\u63a5\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u4ee5\u53ca\u4e0e\u53f3\u8868\u5339\u914d\u7684\u884c\u3002\u5982\u679c\u53f3\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u884c\uff0c\u5219\u8fd4\u56de NULL \u503c\u3002<\/li>\n<li>\u793a\u4f8b\uff1a<code>SELECT * FROM table1 LEFT JOIN table2 ON table1.column = table2.column;<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>\u53f3\u8fde\u63a5\uff08RIGHT JOIN\uff09<\/strong>\uff1a\n<ul>\n<li>\u53f3\u8fde\u63a5\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u4ee5\u53ca\u4e0e\u5de6\u8868\u5339\u914d\u7684\u884c\u3002\u5982\u679c\u5de6\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u884c\uff0c\u5219\u8fd4\u56de NULL \u503c\u3002<\/li>\n<li>Oracle \u4e2d\u901a\u5e38\u4f7f\u7528\u5de6\u8fde\u63a5\u5b9e\u73b0\uff0cRIGHT JOIN \u8bed\u6cd5\u5e76\u4e0d\u76f4\u63a5\u652f\u6301\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7\u6539\u53d8\u8868\u7684\u987a\u5e8f\u5b9e\u73b0\u53f3\u8fde\u63a5\u6548\u679c\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u5168\u5916\u8fde\u63a5\uff08FULL OUTER JOIN\uff09<\/strong>\uff1a\n<ul>\n<li>\u5168\u5916\u8fde\u63a5\u8fd4\u56de\u5de6\u53f3\u4e24\u4e2a\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5e76\u4e14\u5c06\u6ca1\u6709\u5339\u914d\u7684\u884c\u7528 NULL \u503c\u586b\u5145\u3002<\/li>\n<li>Oracle \u4e2d\u901a\u5e38\u901a\u8fc7 UNION ALL \u548c\u5de6\u53f3\u8fde\u63a5\u7684\u7ec4\u5408\u6765\u6a21\u62df\u5b9e\u73b0\u5168\u5916\u8fde\u63a5\u6548\u679c\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>(+) \u7b26\u53f7\u7684\u4f7f\u7528\u6ce8\u610f\u4e8b\u9879<\/strong>\uff1a\n<ul>\n<li>\u5728\u65e7\u7248\u672c\u7684 Oracle \u4e2d\uff0c(+) \u7b26\u53f7\u662f\u4e00\u79cd\u8868\u793a\u5916\u8fde\u63a5\u7684\u8bed\u6cd5\uff0c\u7528\u4e8e\u6307\u793a\u8fde\u63a5\u6761\u4ef6\u3002\u4f8b\u5982\uff0c<code>table1.column = table2.column(+)<\/code> \u8868\u793a\u5de6\u8fde\u63a5\u3002<\/li>\n<li>\u4f7f\u7528 (+) \u7b26\u53f7\u7684\u8fde\u63a5\u8bed\u6cd5\u4e0d\u591f\u76f4\u89c2\u4e14\u5bb9\u6613\u6df7\u6dc6\uff0c\u63a8\u8350\u4f7f\u7528 ANSI SQL \u7684\u8fde\u63a5\u8bed\u6cd5\uff08LEFT JOIN\u3001RIGHT JOIN\u3001FULL OUTER JOIN\uff09\u6765\u4ee3\u66ff (+) \u7b26\u53f7\u3002<\/li>\n<li>(+) \u7b26\u53f7\u7684\u4f7f\u7528\u53ef\u80fd\u4f1a\u5bfc\u81f4\u8fde\u63a5\u6761\u4ef6\u4e0d\u660e\u786e\u6216\u8005\u4ea7\u751f\u4e0d\u6b63\u786e\u7684\u7ed3\u679c\uff0c\u56e0\u6b64\u5efa\u8bae\u4f7f\u7528\u6807\u51c6\u7684 JOIN \u8bed\u6cd5\u6765\u4fdd\u8bc1\u67e5\u8be2\u7684\u51c6\u786e\u6027\u548c\u53ef\u8bfb\u6027\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>\u603b\u4f53\u800c\u8a00\uff0c\u63a8\u8350\u4f7f\u7528 ANSI SQL \u6807\u51c6\u7684\u8fde\u63a5\u8bed\u6cd5\uff08LEFT JOIN\u3001RIGHT JOIN\u3001FULL OUTER JOIN\uff09\u6765\u7f16\u5199\u6e05\u6670\u3001\u6613\u8bfb\u4e14\u51c6\u786e\u7684\u67e5\u8be2\u8bed\u53e5\uff0c\u907f\u514d\u4f7f\u7528\u4e0d\u76f4\u89c2\u7684 (+) \u7b26\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u5de6\u8fde\u63a5\u3001\u53f3\u8fde\u63a5\u3001\u5168\u5916\u8fde\u63a5\u548c (+) \u7b26\u53f7\u662f\u7528\u4e8e\u6267\u884c\u4e0d\u540c\u7c7b\u578b\u8fde\u63a5\u7684\u65b9\u5f0f\uff0c\u5b83\u4eec\u6709\u4e00\u4e9b\u6ce8\u610f\u4e8b\u9879 [&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-15501","post","type-post","status-publish","format-standard","hentry","category-oracel"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15501","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=15501"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15501\/revisions"}],"predecessor-version":[{"id":15502,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15501\/revisions\/15502"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=15501"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=15501"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=15501"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}