{"id":95092,"date":"2024-10-19T22:10:18","date_gmt":"2024-10-19T14:10:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95092\/"},"modified":"2024-10-19T22:10:19","modified_gmt":"2024-10-19T14:10:19","slug":"oracle%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%84%aa%e5%8c%96%e6%96%b9%e6%a1%88%e8%a9%b3%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95092\/","title":{"rendered":"Oracle\u591a\u8868\u67e5\u8a62\u7684\u512a\u5316\u65b9\u6848\u8a73\u89e3"},"content":{"rendered":"<h1 id=\"oracle%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%84%aa%e5%8c%96%e6%96%b9%e6%a1%88%e8%a9%b3%e8%a7%a3-POMBngnqGR\">Oracle\u591a\u8868\u67e5\u8a62\u7684\u512a\u5316\u65b9\u6848\u8a73\u89e3<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u67e5\u8a62\u6027\u80fd\u7684\u512a\u5316\u662f\u63d0\u5347\u7cfb\u7d71\u6548\u7387\u7684\u95dc\u9375\u3002\u7279\u5225\u662f\u5728\u4f7f\u7528Oracle\u6578\u64da\u5eab\u6642\uff0c\u591a\u8868\u67e5\u8a62\u7684\u512a\u5316\u5c24\u70ba\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u591a\u8868\u67e5\u8a62\u7684\u512a\u5316\u65b9\u6848\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-POMBngnqGR\">\u591a\u8868\u67e5\u8a62\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u591a\u8868\u67e5\u8a62\u662f\u6307\u5728\u4e00\u500bSQL\u67e5\u8a62\u4e2d\u540c\u6642\u6d89\u53ca\u5169\u500b\u6216\u591a\u500b\u8868\u7684\u6578\u64da\u6aa2\u7d22\u3002\u9019\u985e\u67e5\u8a62\u901a\u5e38\u4f7f\u7528JOIN\u8a9e\u53e5\u4f86\u9023\u63a5\u4e0d\u540c\u7684\u8868\u3002\u5e38\u898b\u7684JOIN\u985e\u578b\u5305\u62ecINNER JOIN\u3001LEFT JOIN\u3001RIGHT JOIN\u548cFULL OUTER JOIN\u3002<\/p>\n<h2 id=\"%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%80%a7%e8%83%bd%e5%bd%b1%e9%9f%bf%e5%9b%a0%e7%b4%a0-POMBngnqGR\">\u591a\u8868\u67e5\u8a62\u7684\u6027\u80fd\u5f71\u97ff\u56e0\u7d20<\/h2>\n<p>\u5728\u9032\u884c\u591a\u8868\u67e5\u8a62\u6642\uff0c\u6027\u80fd\u53d7\u591a\u7a2e\u56e0\u7d20\u5f71\u97ff\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u8868\u7684\u5927\u5c0f\uff1a<\/strong>\u8868\u7684\u884c\u6578\u548c\u5217\u6578\u6703\u76f4\u63a5\u5f71\u97ff\u67e5\u8a62\u7684\u901f\u5ea6\u3002<\/li>\n<li><strong>\u7d22\u5f15\u7684\u4f7f\u7528\uff1a<\/strong>\u9069\u7576\u7684\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li><strong>\u67e5\u8a62\u7684\u8907\u96dc\u6027\uff1a<\/strong>\u67e5\u8a62\u4e2d\u4f7f\u7528\u7684\u689d\u4ef6\u548cJOIN\u7684\u6578\u91cf\u6703\u5f71\u97ff\u57f7\u884c\u8a08\u5283\u3002<\/li>\n<li><strong>\u6578\u64da\u5206\u4f48\uff1a<\/strong>\u6578\u64da\u7684\u5206\u4f48\u60c5\u6cc1\u6703\u5f71\u97ff\u67e5\u8a62\u7684\u6548\u7387\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%84%aa%e5%8c%96%e6%96%b9%e6%a1%88-POMBngnqGR\">\u512a\u5316\u65b9\u6848<\/h2>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-POMBngnqGR\">1. \u4f7f\u7528\u7d22\u5f15<\/h3>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u6709\u6548\u5de5\u5177\u3002\u5c0d\u65bc\u7d93\u5e38\u7528\u65bcJOIN\u689d\u4ef6\u7684\u5217\uff0c\u61c9\u8003\u616e\u5275\u5efa\u7d22\u5f15\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE INDEX idx_employee_department ON employees(department_id);<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u52a0\u901f\u5728employees\u8868\u548cdepartments\u8868\u4e4b\u9593\u7684JOIN\u64cd\u4f5c\u3002<\/p>\n<h3 id=\"2-%e7%b0%a1%e5%8c%96%e6%9f%a5%e8%a9%a2-POMBngnqGR\">2. \u7c21\u5316\u67e5\u8a62<\/h3>\n<p>\u5728\u8a2d\u8a08\u67e5\u8a62\u6642\uff0c\u61c9\u76e1\u91cf\u7c21\u5316SQL\u8a9e\u53e5\u3002\u907f\u514d\u4e0d\u5fc5\u8981\u7684JOIN\uff0c\u4e26\u53ea\u9078\u64c7\u9700\u8981\u7684\u5217\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT e.name, d.department_name \nFROM employees e \nJOIN departments d ON e.department_id = d.id;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u53ea\u9078\u64c7\u4e86\u5fc5\u8981\u7684\u5217\uff0c\u6e1b\u5c11\u4e86\u6578\u64da\u7684\u50b3\u8f38\u91cf\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8explain%e8%a8%88%e5%8a%83-POMBngnqGR\">3. \u4f7f\u7528EXPLAIN\u8a08\u5283<\/h3>\n<p>\u4f7f\u7528EXPLAIN\u8a9e\u53e5\u53ef\u4ee5\u67e5\u770b\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5e6b\u52a9\u8b58\u5225\u6027\u80fd\u74f6\u9838\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>EXPLAIN SELECT e.name, d.department_name \nFROM employees e \nJOIN departments d ON e.department_id = d.id;<\/code><\/pre>\n<p>\u901a\u904e\u5206\u6790\u57f7\u884c\u8a08\u5283\uff0c\u53ef\u4ee5\u4e86\u89e3Oracle\u5982\u4f55\u8655\u7406\u67e5\u8a62\uff0c\u4e26\u6839\u64da\u7d50\u679c\u9032\u884c\u8abf\u6574\u3002<\/p>\n<h3 id=\"4-%e9%81%bf%e5%85%8d%e4%bd%bf%e7%94%a8select-POMBngnqGR\">4. \u907f\u514d\u4f7f\u7528SELECT *<\/h3>\n<p>\u5728\u67e5\u8a62\u4e2d\u907f\u514d\u4f7f\u7528SELECT *\uff0c\u56e0\u70ba\u9019\u6703\u6aa2\u7d22\u6240\u6709\u5217\uff0c\u589e\u52a0\u4e86\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\u3002\u61c9\u660e\u78ba\u6307\u5b9a\u6240\u9700\u7684\u5217\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT e.name, e.salary \nFROM employees e;<\/code><\/pre>\n<h3 id=\"5-%e8%80%83%e6%85%ae%e4%bd%bf%e7%94%a8%e7%89%a9%e5%8c%96%e8%a6%96%e5%9c%96-POMBngnqGR\">5. \u8003\u616e\u4f7f\u7528\u7269\u5316\u8996\u5716<\/h3>\n<p>\u7269\u5316\u8996\u5716\u53ef\u4ee5\u5b58\u5132\u67e5\u8a62\u7d50\u679c\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u5c0d\u65bc\u7d93\u5e38\u67e5\u8a62\u7684\u6578\u64da\u96c6\uff0c\u53ef\u4ee5\u8003\u616e\u5275\u5efa\u7269\u5316\u8996\u5716\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE MATERIALIZED VIEW mv_employee_department AS \nSELECT e.name, d.department_name \nFROM employees e \nJOIN departments d ON e.department_id = d.id;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-POMBngnqGR\">\u7d50\u8ad6<\/h2>\n<p>\u591a\u8868\u67e5\u8a62\u7684\u512a\u5316\u662f\u4e00\u500b\u8907\u96dc\u4f46\u91cd\u8981\u7684\u904e\u7a0b\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u7d22\u5f15\u3001\u7c21\u5316\u67e5\u8a62\u3001\u5206\u6790\u57f7\u884c\u8a08\u5283\u3001\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5217\u6aa2\u7d22\u4ee5\u53ca\u8003\u616e\u7269\u5316\u8996\u5716\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8Oracle\u6578\u64da\u5eab\u7684\u67e5\u8a62\u6027\u80fd\u3002\u9019\u4e9b\u512a\u5316\u65b9\u6848\u4e0d\u50c5\u80fd\u63d0\u5347\u7cfb\u7d71\u7684\u97ff\u61c9\u901f\u5ea6\uff0c\u9084\u80fd\u6539\u5584\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u5728\u9ad8\u6548\u7684\u74b0\u5883\u4e2d\u904b\u884cOracle\u6578\u64da\u5eab\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u6578\u64da\u5eab\u63d0\u4f9b\u7a69\u5b9a\u548c\u9ad8\u6548\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0eOracle\u591a\u8868\u67e5\u8a62\u7684\u512a\u5316\u65b9\u6848\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u6e1b\u5c11\u8cc7\u6e90\u6d88\u8017\uff0c\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\u6027\u80fd\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-95092","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95092","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=95092"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95092\/revisions"}],"predecessor-version":[{"id":95093,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95092\/revisions\/95093"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95092"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95092"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}