{"id":95310,"date":"2024-10-19T23:59:19","date_gmt":"2024-10-19T15:59:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95310\/"},"modified":"2024-10-19T23:59:19","modified_gmt":"2024-10-19T15:59:19","slug":"oracle%e5%8e%bb%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9a%e5%af%a6%e7%8f%be%e5%bf%ab%e9%80%9f%e9%ab%98%e6%95%88%e7%9a%84%e6%95%b8%e6%93%9a%e6%b8%85%e7%90%86-oracle%e5%bf%ab%e9%80%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95310\/","title":{"rendered":"Oracle\u53bb\u91cd\u8907\u6578\u64da\u5eab\uff1a\u5be6\u73fe\u5feb\u901f\u9ad8\u6548\u7684\u6578\u64da\u6e05\u7406 (oracle\u5feb\u901f\u53bb\u91cd\u8907\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"oracle%e5%8e%bb%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9a%e5%af%a6%e7%8f%be%e5%bf%ab%e9%80%9f%e9%ab%98%e6%95%88%e7%9a%84%e6%95%b8%e6%93%9a%e6%b8%85%e7%90%86-xeiuceotjO\">Oracle\u53bb\u91cd\u8907\u6578\u64da\u5eab\uff1a\u5be6\u73fe\u5feb\u901f\u9ad8\u6548\u7684\u6578\u64da\u6e05\u7406<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u5b8c\u6574\u6027\u81f3\u95dc\u91cd\u8981\u3002\u96a8\u8457\u4f01\u696d\u4e0d\u65b7\u589e\u9577\uff0c\u6578\u64da\u91cf\u4e5f\u96a8\u4e4b\u589e\u52a0\uff0c\u91cd\u8907\u6578\u64da\u7684\u554f\u984c\u8b8a\u5f97\u6108\u767c\u7a81\u51fa\u3002Oracle\u6578\u64da\u5eab\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684\u6578\u64da\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u548c\u6280\u8853\u4f86\u5be6\u73fe\u6578\u64da\u53bb\u91cd\u8907\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u8cea\u91cf\u548c\u53ef\u7528\u6027\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e5%8e%bb%e9%87%8d%e8%a4%87%e6%95%b8%e6%93%9a%ef%bc%9f-xeiuceotjO\">\u70ba\u4ec0\u9ebc\u9700\u8981\u53bb\u91cd\u8907\u6578\u64da\uff1f<\/h2>\n<p>\u91cd\u8907\u6578\u64da\u6703\u5c0e\u81f4\u591a\u7a2e\u554f\u984c\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u6578\u64da\u4e0d\u4e00\u81f4\u6027\uff1a\u4e0d\u540c\u7684\u6578\u64da\u6e90\u53ef\u80fd\u6703\u5c0d\u540c\u4e00\u6578\u64da\u9805\u6709\u4e0d\u540c\u7684\u8a18\u9304\uff0c\u9019\u6703\u5f71\u97ff\u6c7a\u7b56\u7684\u6e96\u78ba\u6027\u3002<\/li>\n<li>\u5b58\u5132\u6210\u672c\u589e\u52a0\uff1a\u91cd\u8907\u7684\u6578\u64da\u4f54\u7528\u984d\u5916\u7684\u5b58\u5132\u7a7a\u9593\uff0c\u589e\u52a0\u4e86\u4f01\u696d\u7684\u904b\u71df\u6210\u672c\u3002<\/li>\n<li>\u6027\u80fd\u4e0b\u964d\uff1a\u67e5\u8a62\u548c\u5831\u544a\u7684\u6548\u7387\u6703\u56e0\u70ba\u91cd\u8907\u6578\u64da\u800c\u964d\u4f4e\uff0c\u5f71\u97ff\u696d\u52d9\u904b\u4f5c\u3002<\/li>\n<\/ul>\n<h2 id=\"oracle%e4%b8%ad%e7%9a%84%e5%8e%bb%e9%87%8d%e8%a4%87%e6%8a%80%e8%a1%93-xeiuceotjO\">Oracle\u4e2d\u7684\u53bb\u91cd\u8907\u6280\u8853<\/h2>\n<p>Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u6578\u64da\u53bb\u91cd\u8907\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u6280\u8853\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8row_number%e5%87%bd%e6%95%b8-xeiuceotjO\">1. \u4f7f\u7528ROW_NUMBER()\u51fd\u6578<\/h3>\n<p>ROW_NUMBER()\u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u70ba\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u5e8f\u865f\uff0c\u7136\u5f8c\u53ef\u4ee5\u6839\u64da\u9019\u500b\u5e8f\u865f\u4f86\u522a\u9664\u91cd\u8907\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>WITH CTE AS (\n    SELECT \n        column1, \n        column2, \n        ROW_NUMBER() OVER (PARTITION BY column1 ORDER BY column2) AS rn\n    FROM \n        your_table\n)\nDELETE FROM CTE WHERE rn &gt; 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u6839\u64dacolumn1\u7684\u503c\u4f86\u5206\u7d44\uff0c\u4e26\u70ba\u6bcf\u7d44\u4e2d\u7684\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u500b\u5e8f\u865f\u3002\u7136\u5f8c\uff0c\u6211\u5011\u522a\u9664\u5e8f\u865f\u5927\u65bc1\u7684\u884c\uff0c\u5f9e\u800c\u4fdd\u7559\u6bcf\u7d44\u4e2d\u7684\u7b2c\u4e00\u884c\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8group-by%e8%aa%9e%e5%8f%a5-xeiuceotjO\">2. \u4f7f\u7528GROUP BY\u8a9e\u53e5<\/h3>\n<p>\u53e6\u4e00\u7a2e\u5e38\u898b\u7684\u65b9\u6cd5\u662f\u4f7f\u7528GROUP BY\u8a9e\u53e5\u4f86\u805a\u5408\u6578\u64da\uff0c\u4e26\u9078\u64c7\u552f\u4e00\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT \n    column1, \n    MIN(column2) AS min_column2\nFROM \n    your_table\nGROUP BY \n    column1;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u7372\u5f97\u6bcf\u500bcolumn1\u7684\u552f\u4e00\u503c\u53ca\u5176\u5c0d\u61c9\u7684\u6700\u5c0fcolumn2\u503c\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8merge%e8%aa%9e%e5%8f%a5-xeiuceotjO\">3. \u4f7f\u7528MERGE\u8a9e\u53e5<\/h3>\n<p>MERGE\u8a9e\u53e5\u53ef\u4ee5\u7528\u4f86\u5408\u4f75\u6578\u64da\uff0c\u4e26\u5728\u5408\u4f75\u904e\u7a0b\u4e2d\u53bb\u9664\u91cd\u8907\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>MERGE INTO target_table t\nUSING source_table s\nON (t.column1 = s.column1)\nWHEN MATCHED THEN\n    UPDATE SET t.column2 = s.column2\nWHEN NOT MATCHED THEN\n    INSERT (column1, column2) VALUES (s.column1, s.column2);<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5728\u5408\u4f75\u904e\u7a0b\u4e2d\u4e0d\u6703\u63d2\u5165\u91cd\u8907\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e6%b8%85%e7%90%86%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-xeiuceotjO\">\u6578\u64da\u6e05\u7406\u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u9032\u884c\u6578\u64da\u53bb\u91cd\u8907\u6642\uff0c\u9075\u5faa\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u53ef\u4ee5\u63d0\u9ad8\u6548\u7387\uff1a<\/p>\n<ul>\n<li>\u5b9a\u671f\u9032\u884c\u6578\u64da\u6e05\u7406\uff1a\u5b9a\u671f\u6aa2\u67e5\u548c\u6e05\u7406\u6578\u64da\u53ef\u4ee5\u9632\u6b62\u91cd\u8907\u6578\u64da\u7684\u7a4d\u7d2f\u3002<\/li>\n<li>\u4f7f\u7528\u81ea\u52d5\u5316\u5de5\u5177\uff1a\u5229\u7528Oracle\u63d0\u4f9b\u7684\u81ea\u52d5\u5316\u5de5\u5177\u4f86\u7c21\u5316\u6578\u64da\u6e05\u7406\u904e\u7a0b\u3002<\/li>\n<li>\u5efa\u7acb\u6578\u64da\u8cea\u91cf\u6a19\u6e96\uff1a\u5236\u5b9a\u660e\u78ba\u7684\u6578\u64da\u8cea\u91cf\u6a19\u6e96\uff0c\u4ee5\u4fbf\u5728\u6578\u64da\u9032\u5165\u7cfb\u7d71\u6642\u9032\u884c\u6aa2\u67e5\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-xeiuceotjO\">\u7d50\u8ad6<\/h2>\n<p>Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u6709\u6548\u7684\u53bb\u91cd\u8907\u6280\u8853\uff0c\u5e6b\u52a9\u4f01\u696d\u63d0\u9ad8\u6578\u64da\u8cea\u91cf\u548c\u904b\u71df\u6548\u7387\u3002\u901a\u904e\u4f7f\u7528ROW_NUMBER()\u3001GROUP BY\u548cMERGE\u7b49\u65b9\u6cd5\uff0c\u4f01\u696d\u53ef\u4ee5\u5feb\u901f\u6e05\u7406\u91cd\u8907\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u5347\u6c7a\u7b56\u7684\u6e96\u78ba\u6027\u548c\u696d\u52d9\u7684\u6574\u9ad4\u8868\u73fe\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u7ba1\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u652f\u6301\u60a8\u7684Oracle\u6578\u64da\u5eab\u904b\u884c\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u53ef\u9760\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u53bb\u91cd\u8907\u6578\u64da\u5eab\u7684\u9ad8\u6548\u6578\u64da\u6e05\u7406\u6280\u8853\uff0c\u5be6\u73fe\u5feb\u901f\u53bb\u91cd\uff0c\u63d0\u5347\u6578\u64da\u8cea\u91cf\u8207\u7ba1\u7406\u6548\u7387\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-95310","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95310","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=95310"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95310\/revisions"}],"predecessor-version":[{"id":95311,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95310\/revisions\/95311"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95310"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95310"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95310"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}