{"id":95418,"date":"2024-10-20T00:53:18","date_gmt":"2024-10-19T16:53:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95418\/"},"modified":"2024-10-20T00:53:18","modified_gmt":"2024-10-19T16:53:18","slug":"oracle%e6%95%b8%e6%93%9a%e5%b0%8d%e8%b1%a1%e4%b8%ad%e7%9a%84%e7%b4%a2%e5%bc%95%e8%88%87%e8%a6%96%e5%9c%96%e7%9a%84%e6%8f%8f%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95418\/","title":{"rendered":"Oracle\u6578\u64da\u5c0d\u8c61\u4e2d\u7684\u7d22\u5f15\u8207\u8996\u5716\u7684\u63cf\u8ff0"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%b0%8d%e8%b1%a1%e4%b8%ad%e7%9a%84%e7%b4%a2%e5%bc%95%e8%88%87%e8%a6%96%e5%9c%96%e7%9a%84%e6%8f%8f%e8%bf%b0-NxzerxCBVI\">Oracle\u6578\u64da\u5c0d\u8c61\u4e2d\u7684\u7d22\u5f15\u8207\u8996\u5716\u7684\u63cf\u8ff0<\/h1>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u7d22\u5f15\u548c\u8996\u5716\u662f\u5169\u500b\u91cd\u8981\u7684\u6578\u64da\u5c0d\u8c61\uff0c\u5b83\u5011\u5728\u6578\u64da\u7ba1\u7406\u548c\u67e5\u8a62\u6027\u80fd\u65b9\u9762\u626e\u6f14\u8457\u95dc\u9375\u89d2\u8272\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u5169\u8005\u7684\u5b9a\u7fa9\u3001\u529f\u80fd\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 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id=\"%e5%89%b5%e5%bb%ba%e7%b4%a2%e5%bc%95%e7%9a%84%e7%a4%ba%e4%be%8b-NxzerxCBVI\">\u5275\u5efa\u7d22\u5f15\u7684\u793a\u4f8b<\/h3>\n<p>\u5728Oracle\u4e2d\uff0c\u5275\u5efa\u7d22\u5f15\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE INDEX index_name ON table_name (column_name);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5728\u540d\u70ba\u201cemployees\u201d\u7684\u8868\u4e0a\u70ba\u201clast_name\u201d\u5217\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>CREATE INDEX idx_lastname ON employees (last_name);<\/code><\/pre>\n<h2 id=\"%e8%a6%96%e5%9c%96%e7%9a%84%e5%ae%9a%e7%be%a9%e8%88%87%e5%8a%9f%e8%83%bd-NxzerxCBVI\">\u8996\u5716\u7684\u5b9a\u7fa9\u8207\u529f\u80fd<\/h2>\n<p>\u8996\u5716\u662f\u4e00\u7a2e\u865b\u64ec\u8868\uff0c\u5b83\u662f\u57fa\u65bc\u67e5\u8a62\u7684\u7d50\u679c\u96c6\u3002\u8996\u5716\u4e0d\u5b58\u5132\u6578\u64da\uff0c\u800c\u662f\u52d5\u614b\u751f\u6210\u6578\u64da\u3002\u8996\u5716\u7684\u4e3b\u8981\u529f\u80fd\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u7c21\u5316\u67e5\u8a62\uff1a\u901a\u904e\u8996\u5716\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u7c21\u5316\u8907\u96dc\u7684\u67e5\u8a62\uff0c\u5f9e\u800c\u63d0\u9ad8\u6548\u7387\u3002<\/li>\n<li>\u6578\u64da\u5b89\u5168\u6027\uff1a\u8996\u5716\u53ef\u4ee5\u9650\u5236\u7528\u6236\u5c0d\u5e95\u5c64\u6578\u64da\u7684\u8a2a\u554f\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u5b89\u5168\u6027\u3002<\/li>\n<li>\u6578\u64da\u6574\u5408\uff1a\u8996\u5716\u53ef\u4ee5\u5c07\u4f86\u81ea\u591a\u500b\u8868\u7684\u6578\u64da\u6574\u5408\u5728\u4e00\u8d77\uff0c\u63d0\u4f9b\u66f4\u5168\u9762\u7684\u6578\u64da\u8996\u5716\u3002<\/li>\n<\/ul>\n<h3 id=\"%e5%89%b5%e5%bb%ba%e8%a6%96%e5%9c%96%e7%9a%84%e7%a4%ba%e4%be%8b-NxzerxCBVI\">\u5275\u5efa\u8996\u5716\u7684\u793a\u4f8b<\/h3>\n<p>\u5728Oracle\u4e2d\uff0c\u5275\u5efa\u8996\u5716\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE VIEW view_name AS SELECT column1, column2 FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5275\u5efa\u4e00\u500b\u540d\u70ba\u201cemployee_view\u201d\u7684\u8996\u5716\uff0c\u986f\u793a\u6240\u6709\u54e1\u5de5\u7684\u59d3\u540d\u548c\u90e8\u9580\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>CREATE VIEW employee_view AS SELECT first_name, last_name, department_id FROM employees;<\/code><\/pre>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e8%88%87%e8%a6%96%e5%9c%96%e7%9a%84%e6%af%94%e8%bc%83-NxzerxCBVI\">\u7d22\u5f15\u8207\u8996\u5716\u7684\u6bd4\u8f03<\/h2>\n<p>\u96d6\u7136\u7d22\u5f15\u548c\u8996\u5716\u5728\u529f\u80fd\u4e0a\u6709\u6240\u4e0d\u540c\uff0c\u4f46\u5b83\u5011\u90fd\u80fd\u5920\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u7d22\u5f15\u4e3b\u8981\u7528\u65bc\u52a0\u901f\u67e5\u8a62\uff0c\u800c\u8996\u5716\u5247\u7528\u65bc\u7c21\u5316\u67e5\u8a62\u548c\u63d0\u9ad8\u6578\u64da\u5b89\u5168\u6027\u3002\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u5408\u7406\u5730\u4f7f\u7528\u7d22\u5f15\u548c\u8996\u5716\u53ef\u4ee5\u986f\u8457\u63d0\u5347\u6578\u64da\u5eab\u7684\u6548\u7387\u548c\u5b89\u5168\u6027\u3002<\/p>\n<h2 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