{"id":95892,"date":"2024-10-20T04:52:18","date_gmt":"2024-10-19T20:52:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95892\/"},"modified":"2024-10-20T04:52:18","modified_gmt":"2024-10-19T20:52:18","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e6%80%a7%e8%83%bd%e7%94%b1sql%e8%aa%9e%e5%8f%a5%e5%9f%b7%e8%a1%8c%e6%95%88%e7%8e%87%e6%b1%ba%e5%ae%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95892\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\u6027\u80fd\u7531SQL\u8a9e\u53e5\u57f7\u884c\u6548\u7387\u6c7a\u5b9a"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e6%80%a7%e8%83%bd%e7%94%b1sql%e8%aa%9e%e5%8f%a5%e5%9f%b7%e8%a1%8c%e6%95%88%e7%8e%87%e6%b1%ba%e5%ae%9a-GALNNcVrpR\">Oracle\u6578\u64da\u5eab\u6027\u80fd\u7531SQL\u8a9e\u53e5\u57f7\u884c\u6548\u7387\u6c7a\u5b9a<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u4f01\u696d\u7684\u904b\u71df\u81f3\u95dc\u91cd\u8981\u3002Oracle\u6578\u64da\u5eab\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5176\u6027\u80fd\u5f80\u5f80\u53d6\u6c7a\u65bcSQL\u8a9e\u53e5\u7684\u57f7\u884c\u6548\u7387\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5f71\u97ffOracle\u6578\u64da\u5eab\u6027\u80fd\u7684\u56e0\u7d20\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u512a\u5316SQL\u8a9e\u53e5\u7684\u5efa\u8b70\u3002<\/p>\n<h2 id=\"sql%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%b7%e8%a1%8c%e6%95%88%e7%8e%87-GALNNcVrpR\">SQL\u8a9e\u53e5\u7684\u57f7\u884c\u6548\u7387<\/h2>\n<p>SQL\u8a9e\u53e5\u7684\u57f7\u884c\u6548\u7387\u76f4\u63a5\u5f71\u97ff\u5230\u6578\u64da\u5eab\u7684\u6574\u9ad4\u6027\u80fd\u3002\u7576SQL\u8a9e\u53e5\u57f7\u884c\u4e0d\u4f73\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u67e5\u8a62\u5ef6\u9072\u3001\u8cc7\u6e90\u6d6a\u8cbb\uff0c\u751a\u81f3\u5f71\u97ff\u5230\u61c9\u7528\u7a0b\u5e8f\u7684\u97ff\u61c9\u6642\u9593\u3002\u4ee5\u4e0b\u662f\u5e7e\u500b\u5f71\u97ffSQL\u57f7\u884c\u6548\u7387\u7684\u4e3b\u8981\u56e0\u7d20\uff1a<\/p>\n<ul>\n<li><strong>\u67e5\u8a62\u8a08\u5283\uff1a<\/strong>Oracle\u6578\u64da\u5eab\u5728\u57f7\u884cSQL\u8a9e\u53e5\u4e4b\u524d\uff0c\u6703\u751f\u6210\u4e00\u500b\u67e5\u8a62\u8a08\u5283\u3002\u9019\u500b\u8a08\u5283\u6c7a\u5b9a\u4e86\u6578\u64da\u7684\u6aa2\u7d22\u65b9\u5f0f\u3002\u5982\u679c\u67e5\u8a62\u8a08\u5283\u4e0d\u4f73\uff0c\u5c07\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<li><strong>\u7d22\u5f15\u7684\u4f7f\u7528\uff1a<\/strong>\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u9069\u7576\u7684\u7d22\u5f15\u53ef\u4ee5\u52a0\u5feb\u6578\u64da\u6aa2\u7d22\u901f\u5ea6\uff0c\u4f46\u904e\u591a\u6216\u4e0d\u7576\u7684\u7d22\u5f15\u5247\u53ef\u80fd\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<li><strong>\u6578\u64da\u91cf\uff1a<\/strong>\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u52a0\uff0c\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u4e5f\u6703\u96a8\u4e4b\u589e\u52a0\u3002\u512a\u5316SQL\u8a9e\u53e5\u4ee5\u6e1b\u5c11\u8655\u7406\u7684\u6578\u64da\u91cf\u662f\u63d0\u9ad8\u6027\u80fd\u7684\u95dc\u9375\u3002<\/li>\n<li><strong>\u6578\u64da\u5eab\u914d\u7f6e\uff1a<\/strong>\u6578\u64da\u5eab\u7684\u914d\u7f6e\u53c3\u6578\uff0c\u5982\u5167\u5b58\u5206\u914d\u3001\u4e26\u884c\u8655\u7406\u7b49\uff0c\u5c0dSQL\u8a9e\u53e5\u7684\u57f7\u884c\u6548\u7387\u4e5f\u6709\u91cd\u8981\u5f71\u97ff\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%84%aa%e5%8c%96sql%e8%aa%9e%e5%8f%a5%e7%9a%84%e7%ad%96%e7%95%a5-GALNNcVrpR\">\u512a\u5316SQL\u8a9e\u53e5\u7684\u7b56\u7565<\/h2>\n<p>\u70ba\u4e86\u63d0\u9ad8Oracle\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u512a\u5316SQL\u8a9e\u53e5\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6709\u6548\u7684\u512a\u5316\u7b56\u7565\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8explain-plan%e5%88%86%e6%9e%90%e6%9f%a5%e8%a9%a2%e8%a8%88%e5%8a%83-GALNNcVrpR\">1. \u4f7f\u7528EXPLAIN PLAN\u5206\u6790\u67e5\u8a62\u8a08\u5283<\/h3>\n<p>\u4f7f\u7528EXPLAIN PLAN\u547d\u4ee4\u53ef\u4ee5\u67e5\u770bOracle\u751f\u6210\u7684\u67e5\u8a62\u8a08\u5283\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u7406\u89e3SQL\u8a9e\u53e5\u7684\u57f7\u884c\u904e\u7a0b\u3002\u901a\u904e\u5206\u6790\u67e5\u8a62\u8a08\u5283\uff0c\u53ef\u4ee5\u8b58\u5225\u51fa\u6027\u80fd\u74f6\u9838\u4e26\u9032\u884c\u76f8\u61c9\u7684\u8abf\u6574\u3002<\/p>\n<pre><code>EXPLAIN PLAN FOR\nSELECT * FROM employees WHERE department_id = 10;<\/code><\/pre>\n<h3 id=\"2-%e9%81%a9%e7%95%b6%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-GALNNcVrpR\">2. \u9069\u7576\u4f7f\u7528\u7d22\u5f15<\/h3>\n<p>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6027\u80fd\u3002\u958b\u767c\u8005\u61c9\u6839\u64da\u67e5\u8a62\u7684\u7279\u9ede\u9078\u64c7\u5408\u9069\u7684\u7d22\u5f15\u985e\u578b\uff0c\u5982B\u6a39\u7d22\u5f15\u6216\u4f4d\u5716\u7d22\u5f15\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u6578\u64da\u7684\u63d2\u5165\u548c\u66f4\u65b0\u6027\u80fd\uff0c\u56e0\u6b64\u61c9\u8b39\u614e\u4f7f\u7528\u3002<\/p>\n<h3 id=\"3-%e6%b8%9b%e5%b0%91%e6%95%b8%e6%93%9a%e6%aa%a2%e7%b4%a2%e9%87%8f-GALNNcVrpR\">3. \u6e1b\u5c11\u6578\u64da\u6aa2\u7d22\u91cf<\/h3>\n<p>\u5728SQL\u8a9e\u53e5\u4e2d\u4f7f\u7528WHERE\u5b50\u53e5\u4f86\u904e\u6ffe\u4e0d\u5fc5\u8981\u7684\u6578\u64da\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u6aa2\u7d22\u7684\u91cf\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT first_name, last_name FROM employees WHERE salary &gt; 50000;<\/code><\/pre>\n<h3 id=\"4-%e9%81%bf%e5%85%8d%e4%bd%bf%e7%94%a8select-GALNNcVrpR\">4. \u907f\u514d\u4f7f\u7528SELECT *<\/h3>\n<p>\u4f7f\u7528SELECT *\u6703\u6aa2\u7d22\u6240\u6709\u5217\uff0c\u9019\u53ef\u80fd\u5c0e\u81f4\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\u3002\u61c9\u8a72\u660e\u78ba\u6307\u5b9a\u9700\u8981\u7684\u5217\uff0c\u4ee5\u6e1b\u5c11\u6578\u64da\u91cf\u3002<\/p>\n<pre><code>SELECT first_name, last_name FROM employees;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-GALNNcVrpR\">\u7d50\u8ad6<\/h2>\n<p>\u7e3d\u4e4b\uff0cOracle\u6578\u64da\u5eab\u7684\u6027\u80fd\u5728\u5f88\u5927\u7a0b\u5ea6\u4e0a\u53d6\u6c7a\u65bcSQL\u8a9e\u53e5\u7684\u57f7\u884c\u6548\u7387\u3002\u901a\u904e\u5206\u6790\u67e5\u8a62\u8a08\u5283\u3001\u9069\u7576\u4f7f\u7528\u7d22\u5f15\u3001\u6e1b\u5c11\u6578\u64da\u6aa2\u7d22\u91cf\u4ee5\u53ca\u907f\u514d\u4f7f\u7528SELECT *\u7b49\u7b56\u7565\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u6301\u7e8c\u512a\u5316SQL\u8a9e\u53e5\u5c07\u6210\u70ba\u78ba\u4fdd\u7cfb\u7d71\u9ad8\u6548\u904b\u884c\u7684\u95dc\u9375\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684Oracle\u6578\u64da\u5eab\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\uff0c\u6eff\u8db3\u696d\u52d9\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u6578\u64da\u5eab\u6027\u80fd\u5982\u4f55\u53d7\u5230SQL\u8a9e\u53e5\u57f7\u884c\u6548\u7387\u7684\u5f71\u97ff\uff0c\u63d0\u5347\u67e5\u8a62\u901f\u5ea6\uff0c\u512a\u5316\u6578\u64da\u8655\u7406\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-95892","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95892","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=95892"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95892\/revisions"}],"predecessor-version":[{"id":95893,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95892\/revisions\/95893"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95892"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95892"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95892"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}