{"id":20348,"date":"2024-01-02T04:41:18","date_gmt":"2024-01-02T04:41:18","guid":{"rendered":"https:\/\/server.hk\/blog\/20348\/"},"modified":"2024-11-14T10:40:00","modified_gmt":"2024-11-14T02:40:00","slug":"postgresql-command-drop-view","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20348\/","title":{"rendered":"PostgreSQL \u6307\u4ee4\uff1aDROP VIEW"},"content":{"rendered":"

PostgreSQL \u6307\u4ee4\uff1aDROP VIEW<\/h1>\n

\u5728 PostgreSQL \u4e2d\uff0cDROP VIEW<\/code> \u6307\u4ee4\u7528\u65bc\u5f9e\u8cc7\u6599\u5eab\u4e2d\u79fb\u9664\u4e00\u500b\u8996\u5716\u3002\u8996\u5716\u662f\u7531\u67e5\u8a62\u7d50\u679c\u884d\u751f\u51fa\u7684\u865b\u64ec\u8cc7\u6599\u8868\uff0c\u5b83\u5011\u63d0\u4f9b\u4e86\u4e00\u7a2e\u7c21\u5316\u8907\u96dc\u67e5\u8a62\u53ca\u5c01\u88dd\u6578\u64da\u6aa2\u7d22\u908f\u8f2f\u7684\u65b9\u6cd5\u3002\u7576\u4e0d\u518d\u9700\u8981\u67d0\u500b\u8996\u5716\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 DROP VIEW<\/code> \u6307\u4ee4\u4f86\u522a\u9664\u5b83\u3002<\/p>\n

\u8a9e\u6cd5<\/h2>\n

DROP VIEW<\/code> \u6307\u4ee4\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

DROP VIEW [IF EXISTS] view_name [, ...] [CASCADE | RESTRICT];\r\n<\/code><\/pre>\n
IF EXISTS<\/code> \u5b50\u53e5\u662f\u53ef\u9078\u7684\uff0c\u5141\u8a31\u5373\u4f7f\u8996\u5716\u4e0d\u5b58\u5728\uff0c\u6307\u4ee4\u4e5f\u80fd\u6210\u529f\u57f7\u884c\u3002CASCADE<\/code> \u95dc\u9375\u5b57\u7528\u65bc\u81ea\u52d5\u522a\u9664\u4f9d\u8cf4\u65bc\u8a72\u8996\u5716\u7684\u5c0d\u8c61\uff0c\u5982\u5176\u4ed6\u8996\u5716\u6216\u51fd\u6578\u3002RESTRICT<\/code> \u95dc\u9375\u5b57\u5247\u963b\u6b62\u5728\u6709\u4f9d\u8cf4\u5c0d\u8c61\u7684\u60c5\u6cc1\u4e0b\u522a\u9664\u8996\u5716\u3002<\/p>\n
\u7bc4\u4f8b<\/h2>\n
\u8b93\u6211\u5011\u4f86\u770b\u4e00\u500b\u5834\u666f\uff0c\u5176\u4e2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba customer_orders<\/code> \u7684\u8996\u5716\uff0c\u5b83\u63d0\u4f9b\u6bcf\u500b\u5ba2\u6236\u7684\u8a02\u55ae\u6458\u8981\uff1a<\/p>\n
CREATE VIEW customer_orders AS\r\nSELECT customers.customer_id, customers.customer_name, COUNT(orders.order_id) AS order_count\r\nFROM customers\r\nJOIN orders ON customers.customer_id = orders.customer_id\r\nGROUP BY customers.customer_id, customers.customer_name;\r\n<\/code><\/pre>\n
\u82e5\u8981\u522a\u9664\u6b64\u8996\u5716\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\uff1a<\/p>\n
DROP VIEW customer_orders;\r\n<\/code><\/pre>\n
\u5982\u679c\u6211\u5011\u60f3\u4e00\u6b21\u522a\u9664\u591a\u500b\u8996\u5716\uff0c\u53ef\u4ee5\u4f7f\u7528\u9017\u865f\u5206\u9694\u5b83\u5011\u7684\u540d\u7a31\uff1a<\/p>\n
DROP VIEW view1, view2, view3;\r\n<\/code><\/pre>\n
\u5982\u679c\u6211\u5011\u53ea\u5e0c\u671b\u5728\u8996\u5716\u5b58\u5728\u6642\u624d\u522a\u9664\u5b83\uff0c\u53ef\u4ee5\u4f7f\u7528 IF EXISTS<\/code> \u5b50\u53e5\uff1a<\/p>\n
DROP VIEW IF EXISTS customer_orders;\r\n<\/code><\/pre>\n
\u6b64\u5916\uff0c\u6211\u5011\u9084\u53ef\u4ee5\u4f7f\u7528 CASCADE<\/code> \u95dc\u9375\u5b57\u4f86\u522a\u9664\u4f9d\u8cf4\u5c0d\u8c61\uff1a<\/p>\n
DROP VIEW customer_orders CASCADE;\r\n<\/code><\/pre>\n
\u9019\u689d\u6307\u4ee4\u5c07\u6703\u522a\u9664 customer_orders<\/code> \u8996\u5716\u53ca\u6240\u6709\u4f9d\u8cf4\u65bc\u5b83\u7684\u5c0d\u8c61\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
PostgreSQL \u4e2d\u7684 DROP VIEW<\/code> \u6307\u4ee4\u5141\u8a31\u6211\u5011\u5f9e\u8cc7\u6599\u5eab\u4e2d\u79fb\u9664\u8996\u5716\u3002\u8996\u5716\u662f\u5f9e\u67e5\u8a62\u4e2d\u884d\u751f\u51fa\u7684\u865b\u64ec\u8cc7\u6599\u8868\uff0c\u80fd\u5920\u7c21\u5316\u8907\u96dc\u7684\u6578\u64da\u6aa2\u7d22\u3002DROP VIEW<\/code> \u6307\u4ee4\u7684\u8a9e\u6cd5\u63d0\u4f9b\u4e86\u8655\u7406\u4f9d\u8cf4\u95dc\u4fc2\u53ca\u6aa2\u67e5\u8996\u5716\u662f\u5426\u5b58\u5728\u7684\u9078\u9805\u3002\u901a\u904e\u4f7f\u7528 DROP VIEW<\/code> \u6307\u4ee4\uff0c\u6211\u5011\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u7ba1\u7406\u8cc7\u6599\u5eab\u7684\u67b6\u69cb\u3002<\/p>\n
\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc VPS \u8a17\u7ba1\u670d\u52d9\u7684\u8cc7\u8a0a\uff0c\u8acb\u8003\u616e\u67e5\u770b Server.HK<\/a>\uff0c\u4ed6\u5011\u63d0\u4f9b\u53ef\u9760\u4e14\u9ad8\u6548\u7684 VPS \u89e3\u6c7a\u65b9\u6848\uff0c\u6eff\u8db3\u5404\u7a2e\u8a17\u7ba1\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
PostgreSQL \u6307\u4ee4\uff1aDR...<\/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-20348","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20348","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=20348"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20348\/revisions"}],"predecessor-version":[{"id":24411,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20348\/revisions\/24411"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20348"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20348"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20348"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}