{"id":20765,"date":"2024-01-02T05:34:21","date_gmt":"2024-01-02T05:34:21","guid":{"rendered":"https:\/\/server.hk\/blog\/20765\/"},"modified":"2024-11-14T10:39:06","modified_gmt":"2024-11-14T02:39:06","slug":"postgresql-command-drop-operator","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20765\/","title":{"rendered":"PostgreSQL \u547d\u4ee4\uff1aDROP OPERATOR"},"content":{"rendered":"<h1 id=\"postgresql-command-drop-operator-WHZpwNqRjf\">PostgreSQL \u547d\u4ee4\uff1aDROP OPERATOR<\/h1>\n<p>PostgreSQL \u662f\u4e00\u6b3e\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u806f\u5f0f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u5ee3\u6cdb\u7684\u529f\u80fd\u548c\u7279\u6027\u3002\u5728 PostgreSQL \u4e2d\uff0c\u4e00\u500b\u57fa\u672c\u547d\u4ee4\u662f DROP OPERATOR \u547d\u4ee4\uff0c\u8a72\u547d\u4ee4\u5141\u8a31\u7528\u6236\u5f9e\u6578\u64da\u5eab\u4e2d\u79fb\u9664\u81ea\u5b9a\u7fa9\u904b\u7b97\u7b26\u3002<\/p>\n<h2 id=\"understanding-operators-in-postgresql-WHZpwNqRjf\">\u7406\u89e3 PostgreSQL \u4e2d\u7684\u904b\u7b97\u7b26<\/h2>\n<p>\u5728 PostgreSQL \u4e2d\uff0c\u904b\u7b97\u7b26\u662f\u7528\u65bc\u5c0d\u6578\u64da\u57f7\u884c\u5404\u7a2e\u64cd\u4f5c\u7684\u7b26\u865f\u6216\u95dc\u9375\u5b57\uff0c\u4f8b\u5982\u7b97\u8853\u3001\u6bd4\u8f03\u6216\u908f\u8f2f\u64cd\u4f5c\u3002\u9019\u4e9b\u904b\u7b97\u7b26\u53ef\u4ee5\u7531\u6578\u64da\u5eab\u7cfb\u7d71\u9810\u5b9a\u7fa9\uff0c\u6216\u7531\u7528\u6236\u6839\u64da\u81ea\u5df1\u7684\u5177\u9ad4\u9700\u6c42\u5275\u5efa\u3002<\/p>\n<p>\u81ea\u5b9a\u7fa9\u904b\u7b97\u7b26\u5728\u5167\u5efa\u904b\u7b97\u7b26\u7121\u6cd5\u6eff\u8db3\u6240\u9700\u529f\u80fd\u7684\u60c5\u6cc1\u4e0b\u975e\u5e38\u6709\u7528\u3002\u7136\u800c\uff0c\u53ef\u80fd\u6703\u51fa\u73fe\u4e0d\u518d\u9700\u8981\u67d0\u500b\u81ea\u5b9a\u7fa9\u904b\u7b97\u7b26\u6216\u60f3\u7528\u53e6\u4e00\u500b\u904b\u7b97\u7b26\u66ff\u63db\u5b83\u7684\u60c5\u6cc1\u3002\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0cDROP OPERATOR \u547d\u4ee4\u4fbf\u6d3e\u4e0a\u7528\u5834\u3002<\/p>\n<h2 id=\"the-drop-operator-command-syntax-WHZpwNqRjf\">DROP OPERATOR \u547d\u4ee4\u8a9e\u6cd5<\/h2>\n<p>\u5728 PostgreSQL \u4e2d\uff0cDROP OPERATOR \u547d\u4ee4\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DROP OPERATOR [IF EXISTS] operator_name (left_type, right_type);\r\n<\/code><\/pre>\n<p>\u8b93\u6211\u5011\u4f86\u89e3\u6790\u9019\u500b\u8a9e\u6cd5\uff1a<\/p>\n<ul>\n<li><code>IF EXISTS<\/code>\uff08\u53ef\u9078\uff09\uff1a\u6b64\u689d\u6b3e\u5141\u8a31\u60a8\u5728\u904b\u7b97\u7b26\u4e0d\u5b58\u5728\u6642\u907f\u514d\u932f\u8aa4\u3002\u5982\u679c\u904b\u7b97\u7b26\u4e0d\u5b58\u5728\uff0c\u8a72\u547d\u4ee4\u5c07\u4ec0\u9ebc\u4e5f\u4e0d\u505a\u3002<\/li>\n<li><code>operator_name<\/code>\uff1a\u6307\u5b9a\u60a8\u60f3\u8981\u79fb\u9664\u7684\u904b\u7b97\u7b26\u540d\u7a31\u3002<\/li>\n<li><code>left_type<\/code> \u548c <code>right_type<\/code>\uff1a\u904b\u7b97\u7b26\u5de6\u53f3\u64cd\u4f5c\u6578\u7684\u6578\u64da\u985e\u578b\u3002<\/li>\n<\/ul>\n<h2 id=\"examples-WHZpwNqRjf\">\u7bc4\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <code>+<\/code> \u7684\u81ea\u5b9a\u7fa9\u904b\u7b97\u7b26\uff0c\u7528\u65bc\u9023\u63a5\u5b57\u7b26\u4e32\u3002\u73fe\u5728\uff0c\u6211\u5011\u60f3\u5c07\u9019\u500b\u904b\u7b97\u7b26\u5f9e\u6578\u64da\u5eab\u4e2d\u79fb\u9664\u3002<\/p>\n<p>\u8981\u522a\u9664\u9019\u500b\u81ea\u5b9a\u7fa9\u904b\u7b97\u7b26\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>DROP OPERATOR IF EXISTS + (text, text);\r\n<\/code><\/pre>\n<p>\u5982\u679c\u904b\u7b97\u7b26\u5b58\u5728\uff0c\u5b83\u5c07\u88ab\u522a\u9664\uff1b\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u8a72\u547d\u4ee4\u5c07\u4e0d\u6703\u6709\u4efb\u4f55\u6548\u679c\u3002<\/p>\n<p>\u53e6\u4e00\u500b\u4f8b\u5b50\u53ef\u80fd\u662f\u79fb\u9664\u4e00\u500b\u57f7\u884c\u7279\u5b9a\u6578\u5b78\u64cd\u4f5c\u7684\u81ea\u5b9a\u7fa9\u904b\u7b97\u7b26\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>^<\/code> \u7684\u81ea\u5b9a\u7fa9\u904b\u7b97\u7b26\uff0c\u7528\u65bc\u6307\u6578\u904b\u7b97\u3002\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u522a\u9664\u9019\u500b\u904b\u7b97\u7b26\uff1a<\/p>\n<pre><code>DROP OPERATOR IF EXISTS ^ (numeric, numeric);\r\n<\/code><\/pre>\n<p>\u540c\u6a23\uff0c\u5982\u679c\u904b\u7b97\u7b26\u5b58\u5728\uff0c\u5b83\u5c07\u88ab\u522a\u9664\uff1b\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u8a72\u547d\u4ee4\u5c07\u4e0d\u6703\u6709\u4efb\u4f55\u5f71\u97ff\u3002<\/p>\n<h2 id=\"summary-WHZpwNqRjf\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u4e2d\u7684 DROP OPERATOR \u547d\u4ee4\u5141\u8a31\u7528\u6236\u5f9e\u6578\u64da\u5eab\u4e2d\u79fb\u9664\u81ea\u5b9a\u7fa9\u904b\u7b97\u7b26\u3002\u904b\u7b97\u7b26\u662f\u7528\u65bc\u5c0d\u6578\u64da\u57f7\u884c\u64cd\u4f5c\u7684\u7b26\u865f\u6216\u95dc\u9375\u5b57\uff0c\u53ef\u4ee5\u5275\u5efa\u81ea\u5b9a\u7fa9\u904b\u7b97\u7b26\u4ee5\u6eff\u8db3\u7279\u5b9a\u9700\u6c42\u3002DROP OPERATOR \u547d\u4ee4\u7684\u8a9e\u6cd5\u5305\u62ec\u904b\u7b97\u7b26\u540d\u7a31\u548c\u5de6\u53f3\u64cd\u4f5c\u6578\u7684\u6578\u64da\u985e\u578b\u3002\u901a\u904e\u4f7f\u7528\u53ef\u9078\u7684 IF EXISTS \u5b50\u53e5\uff0c\u60a8\u53ef\u4ee5\u5728\u904b\u7b97\u7b26\u4e0d\u5b58\u5728\u6642\u907f\u514d\u932f\u8aa4\u3002PostgreSQL \u5728\u7ba1\u7406\u904b\u7b97\u7b26\u65b9\u9762\u7684\u9748\u6d3b\u6027\u4f7f\u5176\u6210\u70ba\u81ea\u5b9a\u7fa9\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u5f37\u5927\u5de5\u5177\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc VPS \u8a17\u7ba1\u7684\u4fe1\u606f\uff0c\u4e26\u63a2\u7d22\u6211\u5011\u9ad8\u54c1\u8cea\u7684 VPS \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL \u547d\u4ee4\uff1aDR&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-20765","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20765","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=20765"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20765\/revisions"}],"predecessor-version":[{"id":24346,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20765\/revisions\/24346"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20765"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20765"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}