{"id":94278,"date":"2024-10-19T18:58:18","date_gmt":"2024-10-19T10:58:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94278\/"},"modified":"2024-10-19T18:58:19","modified_gmt":"2024-10-19T10:58:19","slug":"oracle-sql-%e6%80%a7%e8%83%bd%e7%9a%84%e5%84%aa%e5%8c%96%e8%aa%bf%e6%95%b4%e7%9a%842%e5%a4%a7%e6%ad%a5%e9%a9%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94278\/","title":{"rendered":"Oracle sql \u6027\u80fd\u7684\u512a\u5316\u8abf\u6574\u76842\u5927\u6b65\u9a5f"},"content":{"rendered":"<h1 id=\"oracle-sql-%e6%80%a7%e8%83%bd%e7%9a%84%e5%84%aa%e5%8c%96%e8%aa%bf%e6%95%b4%e7%9a%842%e5%a4%a7%e6%ad%a5%e9%a9%9f-drqWtrAsgw\">Oracle SQL \u6027\u80fd\u7684\u512a\u5316\u8abf\u6574\u76842\u5927\u6b65\u9a5f<\/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 SQL \u4f5c\u70ba\u4e00\u7a2e\u5f37\u5927\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u548c\u6280\u8853\u4f86\u512a\u5316\u67e5\u8a62\u6027\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5169\u500b\u4e3b\u8981\u7684\u6b65\u9a5f\uff0c\u4ee5\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u8abf\u6574 Oracle SQL \u7684\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e7%ac%ac%e4%b8%80%e6%ad%a5%ef%bc%9a%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96-drqWtrAsgw\">\u7b2c\u4e00\u6b65\uff1a\u67e5\u8a62\u512a\u5316<\/h2>\n<p>\u67e5\u8a62\u512a\u5316\u662f\u63d0\u5347 Oracle SQL \u6027\u80fd\u7684\u9996\u8981\u6b65\u9a5f\u3002\u9019\u4e00\u904e\u7a0b\u6d89\u53ca\u5230\u5c0d SQL \u67e5\u8a62\u7684\u5206\u6790\u548c\u6539\u9032\uff0c\u4ee5\u6e1b\u5c11\u57f7\u884c\u6642\u9593\u548c\u8cc7\u6e90\u6d88\u8017\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u67e5\u8a62\u512a\u5316\u6280\u5de7\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u7d22\u5f15\uff1a<\/strong>\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u78ba\u4fdd\u5728\u7d93\u5e38\u7528\u65bc\u67e5\u8a62\u7684\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u4e00\u500b\u67e5\u8a62\uff1a<\/li>\n<pre><code>SELECT * FROM employees WHERE department_id = 10;<\/code><\/pre>\n<p>\u5728 <code>department_id<\/code> \u5217\u4e0a\u5275\u5efa\u7d22\u5f15\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002<\/p>\n<li><strong>\u907f\u514d\u4f7f\u7528 SELECT *\uff1a<\/strong>\u4f7f\u7528 <code>SELECT *<\/code> \u6703\u5c0e\u81f4\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\uff0c\u61c9\u8a72\u660e\u78ba\u6307\u5b9a\u6240\u9700\u7684\u5217\u3002\u4f8b\u5982\uff1a<\/li>\n<pre><code>SELECT first_name, last_name FROM employees WHERE department_id = 10;<\/code><\/pre>\n<li><strong>\u4f7f\u7528\u5408\u9069\u7684 JOIN\uff1a<\/strong>\u5728\u591a\u8868\u67e5\u8a62\u4e2d\uff0c\u9078\u64c7\u5408\u9069\u7684 JOIN \u985e\u578b\uff08\u5982 INNER JOIN\u3001LEFT JOIN\uff09\u53ef\u4ee5\u5f71\u97ff\u6027\u80fd\u3002\u78ba\u4fdd\u53ea\u9078\u64c7\u5fc5\u8981\u7684\u8868\u548c\u5217\u3002<\/li>\n<li><strong>\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8a08\u7b97\uff1a<\/strong>\u5728 WHERE \u5b50\u53e5\u4e2d\u9032\u884c\u8a08\u7b97\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u61c9\u8a72\u5c07\u8a08\u7b97\u79fb\u5230\u67e5\u8a62\u5916\u90e8\uff0c\u6216\u4f7f\u7528\u9810\u8a08\u7b97\u7684\u5217\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%ac%ac%e4%ba%8c%e6%ad%a5%ef%bc%9a%e6%95%b8%e6%93%9a%e5%ba%ab%e9%85%8d%e7%bd%ae%e8%aa%bf%e6%95%b4-drqWtrAsgw\">\u7b2c\u4e8c\u6b65\uff1a\u6578\u64da\u5eab\u914d\u7f6e\u8abf\u6574<\/h2>\n<p>\u9664\u4e86\u67e5\u8a62\u512a\u5316\uff0c\u6578\u64da\u5eab\u7684\u914d\u7f6e\u8abf\u6574\u4e5f\u662f\u63d0\u5347\u6027\u80fd\u7684\u91cd\u8981\u6b65\u9a5f\u3002\u9019\u5305\u62ec\u8abf\u6574\u6578\u64da\u5eab\u7684\u53c3\u6578\u8a2d\u7f6e\uff0c\u4ee5\u9069\u61c9\u7279\u5b9a\u7684\u5de5\u4f5c\u8ca0\u8f09\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u95dc\u9375\u7684\u914d\u7f6e\u8abf\u6574\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li><strong>\u8abf\u6574\u5167\u5b58\u5206\u914d\uff1a<\/strong>Oracle \u6578\u64da\u5eab\u7684\u6027\u80fd\u5728\u5f88\u5927\u7a0b\u5ea6\u4e0a\u53d6\u6c7a\u65bc\u5167\u5b58\u7684\u914d\u7f6e\u3002\u78ba\u4fdd\u9069\u7576\u914d\u7f6e <code>SGA<\/code>\uff08\u7cfb\u7d71\u5168\u5c40\u5340\uff09\u548c <code>PGA<\/code>\uff08\u7a0b\u5e8f\u5168\u5c40\u5340\uff09\u7684\u5927\u5c0f\uff0c\u4ee5\u652f\u6301\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u3002<\/li>\n<li><strong>\u914d\u7f6e\u4e26\u884c\u8655\u7406\uff1a<\/strong>\u6839\u64da\u5de5\u4f5c\u8ca0\u8f09\u7684\u7279\u6027\uff0c\u555f\u7528\u4e26\u884c\u8655\u7406\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u901a\u904e\u8a2d\u7f6e <code>PARALLEL<\/code> \u53c3\u6578\uff0c\u53ef\u4ee5\u8b93\u591a\u500b\u9032\u7a0b\u540c\u6642\u8655\u7406\u67e5\u8a62\u3002<\/li>\n<li><strong>\u76e3\u63a7\u548c\u8abf\u6574 I\/O \u6027\u80fd\uff1a<\/strong>\u78ba\u4fdd\u6578\u64da\u5eab\u7684 I\/O \u6027\u80fd\u9054\u5230\u6700\u4f73\u72c0\u614b\u3002\u4f7f\u7528 <code>DBA_HIST_IOSTAT<\/code> \u4f86\u76e3\u63a7 I\/O \u6027\u80fd\uff0c\u4e26\u6839\u64da\u9700\u8981\u8abf\u6574\u5b58\u5132\u914d\u7f6e\u3002<\/li>\n<li><strong>\u5b9a\u671f\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\uff1a<\/strong>Oracle \u4f7f\u7528\u7d71\u8a08\u4fe1\u606f\u4f86\u751f\u6210\u6700\u4f73\u57f7\u884c\u8a08\u5283\u3002\u5b9a\u671f\u57f7\u884c <code>DBMS_STATS.GATHER_SCHEMA_STATS<\/code> \u4f86\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\uff0c\u4ee5\u78ba\u4fdd\u67e5\u8a62\u512a\u5316\u5668\u80fd\u5920\u505a\u51fa\u6700\u4f73\u6c7a\u7b56\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-drqWtrAsgw\">\u7e3d\u7d50<\/h2>\n<p>\u901a\u904e\u4ee5\u4e0a\u5169\u5927\u6b65\u9a5f\uff0c\u5373\u67e5\u8a62\u512a\u5316\u548c\u6578\u64da\u5eab\u914d\u7f6e\u8abf\u6574\uff0c\u60a8\u53ef\u4ee5\u986f\u8457\u63d0\u5347 Oracle SQL \u7684\u6027\u80fd\u3002\u9019\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\uff0c\u9084\u80fd\u6e1b\u5c11\u8cc7\u6e90\u6d88\u8017\uff0c\u5f9e\u800c\u63d0\u5347\u6574\u9ad4\u7cfb\u7d71\u7684\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9019\u4e9b\u512a\u5316\u63aa\u65bd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u5be6\u73fe\u6700\u4f73\u7684\u6578\u64da\u5eab\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle SQL\u6027\u80fd\u512a\u5316\u7684\u5169\u5927\u6b65\u9a5f\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u6e1b\u5c11\u57f7\u884c\u6642\u9593\uff0c\u5be6\u73fe\u6578\u64da\u5eab\u6700\u4f73\u5316\u7ba1\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-94278","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94278","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=94278"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94278\/revisions"}],"predecessor-version":[{"id":94279,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94278\/revisions\/94279"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94278"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94278"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94278"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}