{"id":20757,"date":"2024-01-02T05:26:22","date_gmt":"2024-01-02T05:26:22","guid":{"rendered":"https:\/\/server.hk\/blog\/20757\/"},"modified":"2024-11-14T10:39:15","modified_gmt":"2024-11-14T02:39:15","slug":"postgresql-command-drop-collation","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20757\/","title":{"rendered":"PostgreSQL \u547d\u4ee4\uff1aDROP COLLATION"},"content":{"rendered":"<h1 id=\"postgresql-command-drop-collation-EUmDbwSiSm\">PostgreSQL \u547d\u4ee4\uff1aDROP COLLATION<\/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\u7ba1\u7406\u6578\u64da\u5eab\u7684\u4e00\u500b\u57fa\u672c\u65b9\u9762\u662f\u80fd\u5920\u64cd\u4f5c\u6392\u5e8f\u898f\u5247\u3002\u6392\u5e8f\u898f\u5247\u6c7a\u5b9a\u4e86\u5728\u6578\u64da\u5eab\u4e2d\u5b57\u7b26\u4e32\u6bd4\u8f03\u548c\u6392\u5e8f\u64cd\u4f5c\u7684\u9032\u884c\u65b9\u5f0f\u3002\u5728 PostgreSQL \u4e2d\uff0c<code>DROP COLLATION<\/code> \u547d\u4ee4\u5141\u8a31\u60a8\u79fb\u9664\u4e0d\u518d\u9700\u8981\u7684\u6392\u5e8f\u898f\u5247\u3002<\/p>\n<h2 id=\"understanding-collations-in-postgresql-EUmDbwSiSm\">\u7406\u89e3 PostgreSQL \u4e2d\u7684\u6392\u5e8f\u898f\u5247<\/h2>\n<p>\u5728 PostgreSQL \u4e2d\uff0c\u6392\u5e8f\u898f\u5247\u662f\u4e00\u7d44\u898f\u5247\uff0c\u5b9a\u7fa9\u4e86\u5b57\u7b26\u7684\u6392\u5e8f\u548c\u6bd4\u8f03\u65b9\u5f0f\u3002\u5b83\u6307\u5b9a\u4e86\u5728\u9032\u884c\u5b57\u7b26\u4e32\u64cd\u4f5c\uff08\u5982\u6392\u5e8f\u3001\u641c\u7d22\u548c\u6bd4\u8f03\uff09\u6642\u5b57\u7b26\u7684\u8003\u616e\u9806\u5e8f\u3002\u6392\u5e8f\u898f\u5247\u5c0d\u65bc\u78ba\u4fdd\u5b57\u7b26\u4e32\u64cd\u4f5c\u6839\u64da\u8a9e\u8a00\u548c\u6587\u5316\u7fd2\u4fd7\u6b63\u78ba\u57f7\u884c\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<p>PostgreSQL \u652f\u63f4\u591a\u7a2e\u6392\u5e8f\u898f\u5247\uff0c\u5305\u62ec\u57fa\u65bc\u4e0d\u540c\u8a9e\u8a00\u3001\u5730\u5340\u548c\u5b57\u7b26\u96c6\u7684\u6392\u5e8f\u898f\u5247\u3002\u6bcf\u500b\u6392\u5e8f\u898f\u5247\u90fd\u6709\u4e00\u500b\u552f\u4e00\u7684\u540d\u7a31\uff0c\u4ee5\u4fbf\u5728\u6578\u64da\u5eab\u4e2d\u8b58\u5225\u5b83\u3002<\/p>\n<h2 id=\"the-drop-collation-command-EUmDbwSiSm\">DROP COLLATION \u547d\u4ee4<\/h2>\n<p>PostgreSQL \u4e2d\u7684 <code>DROP COLLATION<\/code> \u547d\u4ee4\u5141\u8a31\u60a8\u5f9e\u6578\u64da\u5eab\u4e2d\u79fb\u9664\u4e00\u500b\u6392\u5e8f\u898f\u5247\u3002\u8a72\u547d\u4ee4\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DROP COLLATION [IF EXISTS] collation_name;\r\n<\/code><\/pre>\n<p>\u5176\u4e2d <code>IF EXISTS<\/code> \u5b50\u53e5\u662f\u53ef\u9078\u7684\uff0c\u5141\u8a31\u60a8\u907f\u514d\u5728\u6307\u5b9a\u7684\u6392\u5e8f\u898f\u5247\u4e0d\u5b58\u5728\u6642\u5f15\u767c\u932f\u8aa4\u3002<\/p>\n<p>\u7576\u60a8\u57f7\u884c <code>DROP COLLATION<\/code> \u547d\u4ee4\u6642\uff0cPostgreSQL \u5c07\u5f9e\u6578\u64da\u5eab\u4e2d\u79fb\u9664\u6307\u5b9a\u7684\u6392\u5e8f\u898f\u5247\u3002\u7136\u800c\uff0c\u5728\u4f7f\u7528\u6b64\u547d\u4ee4\u6642\u9700\u8b39\u614e\uff0c\u56e0\u70ba\u5b83\u53ef\u80fd\u6703\u5c0d\u4f9d\u8cf4\u8a72\u6392\u5e8f\u898f\u5247\u7684\u73fe\u6709\u6578\u64da\u548c\u67e5\u8a62\u7522\u751f\u5f71\u97ff\u3002<\/p>\n<h2 id=\"examples-EUmDbwSiSm\">\u7bc4\u4f8b<\/h2>\n<p>\u8b93\u6211\u5011\u8003\u616e\u5e7e\u500b\u7bc4\u4f8b\uff0c\u4ee5\u4e86\u89e3 <code>DROP COLLATION<\/code> \u547d\u4ee4\u7684\u904b\u4f5c\u65b9\u5f0f\u3002<\/p>\n<p><strong>\u7bc4\u4f8b 1\uff1a<\/strong><\/p>\n<pre><code>DROP COLLATION IF EXISTS french;\r\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c<code>DROP COLLATION<\/code> \u547d\u4ee4\u5f9e\u6578\u64da\u5eab\u4e2d\u79fb\u9664\u540d\u70ba &#8220;french&#8221; \u7684\u6392\u5e8f\u898f\u5247\u3002\u5982\u679c\u8a72\u6392\u5e8f\u898f\u5247\u4e0d\u5b58\u5728\uff0c\u5247\u4e0d\u6703\u5f15\u767c\u932f\u8aa4\u3002<\/p>\n<p><strong>\u7bc4\u4f8b 2\uff1a<\/strong><\/p>\n<pre><code>DROP COLLATION english;\r\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c<code>DROP COLLATION<\/code> \u547d\u4ee4\u5f9e\u6578\u64da\u5eab\u4e2d\u79fb\u9664\u540d\u70ba &#8220;english&#8221; \u7684\u6392\u5e8f\u898f\u5247\u3002\u5982\u679c\u8a72\u6392\u5e8f\u898f\u5247\u4e0d\u5b58\u5728\uff0c\u5247\u5c07\u5f15\u767c\u932f\u8aa4\u3002<\/p>\n<h2 id=\"summary-EUmDbwSiSm\">\u6458\u8981<\/h2>\n<p>PostgreSQL \u4e2d\u7684 <code>DROP COLLATION<\/code> \u547d\u4ee4\u5141\u8a31\u60a8\u5f9e\u6578\u64da\u5eab\u4e2d\u79fb\u9664\u4e00\u500b\u6392\u5e8f\u898f\u5247\u3002\u6392\u5e8f\u898f\u5247\u5c0d\u65bc\u78ba\u5b9a\u5b57\u7b26\u4e32\u64cd\u4f5c\u4e2d\u7684\u5b57\u7b26\u9806\u5e8f\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u4f7f\u7528 <code>DROP COLLATION<\/code> \u547d\u4ee4\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406 PostgreSQL \u6578\u64da\u5eab\u4e2d\u7684\u6392\u5e8f\u898f\u5247\u3002<\/p>\n<p>\u6709\u95dc VPS \u8a17\u7ba1\u4ee5\u53ca\u5982\u4f55\u4f7f\u5176\u60e0\u53ca\u60a8\u7684\u696d\u52d9\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u8acb\u8003\u616e\u63a2\u7d22 <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002\u6191\u85c9\u5176\u4e00\u6d41\u7684 VPS \u89e3\u6c7a\u65b9\u6848\uff0c\u60a8\u53ef\u4ee5\u7372\u5f97\u53ef\u9760\u4e14\u9ad8\u6027\u80fd\u7684\u61c9\u7528\u7a0b\u5f0f\u8a17\u7ba1\u9ad4\u9a57\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-20757","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20757","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=20757"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20757\/revisions"}],"predecessor-version":[{"id":24355,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20757\/revisions\/24355"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20757"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20757"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20757"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}