{"id":20338,"date":"2024-01-02T04:31:19","date_gmt":"2024-01-02T04:31:19","guid":{"rendered":"https:\/\/server.hk\/blog\/20338\/"},"modified":"2024-11-14T10:40:11","modified_gmt":"2024-11-14T02:40:11","slug":"postgresql-command-delete","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20338\/","title":{"rendered":"PostgreSQL \u6307\u4ee4\uff1aDELETE"},"content":{"rendered":"<h1 id=\"postgresql-command-delete-fvTwNUFgNC\">PostgreSQL \u6307\u4ee4\uff1aDELETE<\/h1>\n<p>PostgreSQL \u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u806f\u5f0f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u591a\u7a2e\u6307\u4ee4\u4ee5\u64cd\u4f5c\u548c\u7ba1\u7406\u6578\u64da\u3002\u5728 PostgreSQL \u4e2d\uff0c\u4e00\u500b\u57fa\u672c\u7684\u6307\u4ee4\u662f DELETE \u6307\u4ee4\uff0c\u8a72\u6307\u4ee4\u5141\u8a31\u7528\u6236\u6839\u64da\u6307\u5b9a\u7684\u689d\u4ef6\u5f9e\u8868\u683c\u4e2d\u79fb\u9664\u8a18\u9304\u3002<\/p>\n<h2 id=\"syntax-fvTwNUFgNC\">\u8a9e\u6cd5<\/h2>\n<p>PostgreSQL \u4e2d DELETE \u6307\u4ee4\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DELETE FROM table_name\r\nWHERE condition;<\/code><\/pre>\n<p><code>table_name<\/code> \u53c3\u6578\u4ee3\u8868\u60a8\u60f3\u8981\u522a\u9664\u8a18\u9304\u7684\u8868\u683c\u540d\u7a31\u3002<code>condition<\/code> \u53c3\u6578\u6307\u5b9a\u5fc5\u9808\u6eff\u8db3\u7684\u6e96\u5247\uff0c\u624d\u80fd\u522a\u9664\u8a72\u8a18\u9304\u3002\u5982\u679c\u7701\u7565 <code>condition<\/code>\uff0c\u5247\u6703\u522a\u9664\u8868\u683c\u4e2d\u7684\u6240\u6709\u8a18\u9304\u3002<\/p>\n<h2 id=\"examples-fvTwNUFgNC\">\u793a\u4f8b<\/h2>\n<p>\u8b93\u6211\u5011\u901a\u904e\u4e00\u4e9b\u793a\u4f8b\u4f86\u4e86\u89e3 DELETE \u6307\u4ee4\u5728 PostgreSQL \u4e2d\u7684\u904b\u4f5c\u65b9\u5f0f\u3002<\/p>\n<h3 id=\"example-1-deleting-a-single-record-fvTwNUFgNC\">\u793a\u4f8b 1\uff1a\u522a\u9664\u55ae\u4e00\u8a18\u9304<\/h3>\n<p>\u8981\u5f9e\u8868\u683c\u4e2d\u522a\u9664\u55ae\u4e00\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>DELETE FROM employees\r\nWHERE id = 1;<\/code><\/pre>\n<p>\u9019\u500b\u6307\u4ee4\u5c07\u522a\u9664 &#8220;employees&#8221; \u8868\u683c\u4e2d &#8220;id&#8221; \u5217\u7b49\u65bc 1 \u7684\u8a18\u9304\u3002<\/p>\n<h3 id=\"example-2-deleting-multiple-records-fvTwNUFgNC\">\u793a\u4f8b 2\uff1a\u522a\u9664\u591a\u500b\u8a18\u9304<\/h3>\n<p>\u5982\u679c\u60a8\u60f3\u8981\u522a\u9664\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u591a\u500b\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>DELETE FROM customers\r\nWHERE age &gt;= 60;<\/code><\/pre>\n<p>\u9019\u500b\u6307\u4ee4\u5c07\u522a\u9664 &#8220;customers&#8221; \u8868\u683c\u4e2d &#8220;age&#8221; \u5217\u5927\u65bc\u6216\u7b49\u65bc 60 \u7684\u6240\u6709\u8a18\u9304\u3002<\/p>\n<h3 id=\"example-3-deleting-all-records-fvTwNUFgNC\">\u793a\u4f8b 3\uff1a\u522a\u9664\u6240\u6709\u8a18\u9304<\/h3>\n<p>\u5982\u679c\u60a8\u60f3\u8981\u522a\u9664\u8868\u683c\u4e2d\u7684\u6240\u6709\u8a18\u9304\uff0c\u53ef\u4ee5\u7701\u7565 <code>WHERE<\/code> \u5b50\u53e5\uff1a<\/p>\n<pre><code>DELETE FROM orders;<\/code><\/pre>\n<p>\u9019\u500b\u6307\u4ee4\u5c07\u522a\u9664 &#8220;orders&#8221; \u8868\u683c\u4e2d\u7684\u6240\u6709\u8a18\u9304\u3002<\/p>\n<h2 id=\"important-considerations-fvTwNUFgNC\">\u91cd\u8981\u8003\u616e\u4e8b\u9805<\/h2>\n<p>\u5728 PostgreSQL \u4e2d\u4f7f\u7528 DELETE \u6307\u4ee4\u6642\uff0c\u6709\u5e7e\u500b\u91cd\u8981\u7684\u8003\u616e\u4e8b\u9805\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u522a\u9664\u8a18\u9304\u662f\u4e00\u500b\u6c38\u4e45\u6027\u52d5\u4f5c\uff0c\u4e26\u4e14\u6c92\u6709\u5167\u7f6e\u7684\u64a4\u92b7\u529f\u80fd\u3002\u5728\u57f7\u884c\u6307\u4ee4\u4e4b\u524d\uff0c\u52d9\u5fc5\u4ed4\u7d30\u6aa2\u67e5\u689d\u4ef6\u3002<\/li>\n<li>\u5982\u679c\u5b58\u5728\u5916\u9375\u7d04\u675f\uff0c\u522a\u9664\u8a18\u9304\u53ef\u80fd\u6703\u5c0d\u76f8\u95dc\u8868\u683c\u7522\u751f\u9023\u9396\u5f71\u97ff\u3002\u78ba\u4fdd\u60a8\u4e86\u89e3\u8868\u683c\u4e4b\u9593\u7684\u95dc\u4fc2\u53ca\u522a\u9664\u8a18\u9304\u53ef\u80fd\u5e36\u4f86\u7684\u5f8c\u679c\u3002<\/li>\n<li>\u522a\u9664\u5927\u91cf\u8a18\u9304\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\u3002\u8003\u616e\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u9650\u5236\u53d7\u5f71\u97ff\u7684\u8a18\u9304\u6578\u91cf\u3002<\/li>\n<\/ul>\n<h2 id=\"summary-fvTwNUFgNC\">\u6458\u8981<\/h2>\n<p>PostgreSQL \u4e2d\u7684 DELETE \u6307\u4ee4\u5141\u8a31\u7528\u6236\u6839\u64da\u6307\u5b9a\u689d\u4ef6\u5f9e\u8868\u683c\u4e2d\u522a\u9664\u8a18\u9304\u3002\u9019\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u7528\u65bc\u7ba1\u7406\u6578\u64da\u4e26\u7dad\u8b77\u6578\u64da\u5eab\u7684\u5b8c\u6574\u6027\u3002\u7121\u8ad6\u60a8\u9700\u8981\u522a\u9664\u55ae\u4e00\u8a18\u9304\u9084\u662f\u591a\u500b\u8a18\u9304\uff0cDELETE \u6307\u4ee4\u90fd\u63d0\u4f9b\u4e86\u9748\u6d3b\u6027\u4ee5\u6eff\u8db3\u60a8\u7684\u8981\u6c42\u3002<\/p>\n<p>\u5982\u9700\u53ef\u9760\u9ad8\u6548\u7684 VPS \u8a17\u7ba1\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8003\u616e <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002\u6191\u85c9\u591a\u7a2e\u8a17\u7ba1\u8a08\u5283\u548c\u512a\u79c0\u7684\u5ba2\u6236\u652f\u6301\uff0cServer.HK \u662f\u884c\u696d\u5167\u503c\u5f97\u4fe1\u8cf4\u7684\u4f9b\u61c9\u5546\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL \u6307\u4ee4\uff1aDE&#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-20338","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20338","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=20338"}],"version-history":[{"count":2,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20338\/revisions"}],"predecessor-version":[{"id":24422,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20338\/revisions\/24422"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20338"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}