{"id":95542,"date":"2024-10-20T01:55:16","date_gmt":"2024-10-19T17:55:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95542\/"},"modified":"2024-10-20T01:55:16","modified_gmt":"2024-10-19T17:55:16","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e9%80%a3%e6%8e%a5%e6%96%b9%e5%bc%8f%e5%8f%8a%e5%b8%b8%e8%a6%8b%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95542\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\u8868\u9023\u63a5\u65b9\u5f0f\u53ca\u5e38\u898b\u7528\u6cd5"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e9%80%a3%e6%8e%a5%e6%96%b9%e5%bc%8f%e5%8f%8a%e5%b8%b8%e8%a6%8b%e7%94%a8%e6%b3%95-zKFEmCtjpO\">Oracle\u6578\u64da\u5eab\u8868\u9023\u63a5\u65b9\u5f0f\u53ca\u5e38\u898b\u7528\u6cd5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u8868\u4e4b\u9593\u7684\u9023\u63a5\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u5c24\u5176\u662f\u5728\u4f7f\u7528Oracle\u6578\u64da\u5eab\u6642\u3002\u900f\u904e\u6709\u6548\u7684\u8868\u9023\u63a5\uff0c\u53ef\u4ee5\u66f4\u597d\u5730\u7d44\u7e54\u548c\u67e5\u8a62\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0eOracle\u6578\u64da\u5eab\u7684\u8868\u9023\u63a5\u65b9\u5f0f\u53ca\u5176\u5e38\u898b\u7528\u6cd5\u3002<\/p>\n<h2 id=\"1-%e8%a1%a8%e9%80%a3%e6%8e%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-zKFEmCtjpO\">1. \u8868\u9023\u63a5\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u8868\u9023\u63a5\u662f\u6307\u5728\u67e5\u8a62\u4e2d\u5c07\u5169\u500b\u6216\u591a\u500b\u8868\u7684\u6578\u64da\u6839\u64da\u67d0\u4e9b\u689d\u4ef6\u9032\u884c\u7d44\u5408\u7684\u904e\u7a0b\u3002\u9019\u4e9b\u689d\u4ef6\u901a\u5e38\u662f\u57fa\u65bc\u8868\u4e4b\u9593\u7684\u95dc\u806f\uff0c\u4f8b\u5982\u4e3b\u9375\u548c\u5916\u9375\u3002Oracle\u652f\u6301\u591a\u7a2e\u9023\u63a5\u65b9\u5f0f\uff0c\u5305\u62ec\u5167\u9023\u63a5\u3001\u5916\u9023\u63a5\u3001\u4ea4\u53c9\u9023\u63a5\u7b49\u3002<\/p>\n<h2 id=\"2-%e5%85%a7%e9%80%a3%e6%8e%a5%ef%bc%88inner-join%ef%bc%89-zKFEmCtjpO\">2. \u5167\u9023\u63a5\uff08INNER JOIN\uff09<\/h2>\n<p>\u5167\u9023\u63a5\u662f\u6700\u5e38\u7528\u7684\u9023\u63a5\u65b9\u5f0f\uff0c\u5b83\u53ea\u8fd4\u56de\u5728\u5169\u500b\u8868\u4e2d\u90fd\u5b58\u5728\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u5167\u9023\u63a5\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT a.column1, b.column2\nFROM table_a a\nINNER JOIN table_b b ON a.id = b.a_id;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u53ea\u6709\u7576table_a\u548ctable_b\u4e2d\u90fd\u6709\u76f8\u61c9\u7684id\u6642\uff0c\u624d\u6703\u8fd4\u56de\u7d50\u679c\u3002<\/p>\n<h2 id=\"3-%e5%a4%96%e9%80%a3%e6%8e%a5%ef%bc%88outer-join%ef%bc%89-zKFEmCtjpO\">3. \u5916\u9023\u63a5\uff08OUTER JOIN\uff09<\/h2>\n<p>\u5916\u9023\u63a5\u5206\u70ba\u5de6\u5916\u9023\u63a5\uff08LEFT JOIN\uff09\u548c\u53f3\u5916\u9023\u63a5\uff08RIGHT JOIN\uff09\u3002\u5de6\u5916\u9023\u63a5\u8fd4\u56de\u5de6\u8868\u7684\u6240\u6709\u8a18\u9304\uff0c\u5373\u4f7f\u53f3\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u8a18\u9304\uff1b\u53f3\u5916\u9023\u63a5\u5247\u76f8\u53cd\u3002<\/p>\n<h3 id=\"3-1-%e5%b7%a6%e5%a4%96%e9%80%a3%e6%8e%a5%ef%bc%88left-join%ef%bc%89-zKFEmCtjpO\">3.1 \u5de6\u5916\u9023\u63a5\uff08LEFT JOIN\uff09<\/h3>\n<pre><code>SELECT a.column1, b.column2\nFROM table_a a\nLEFT JOIN table_b b ON a.id = b.a_id;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56detable_a\u4e2d\u7684\u6240\u6709\u8a18\u9304\uff0c\u5373\u4f7ftable_b\u4e2d\u6c92\u6709\u5c0d\u61c9\u7684\u8a18\u9304\u3002<\/p>\n<h3 id=\"3-2-%e5%8f%b3%e5%a4%96%e9%80%a3%e6%8e%a5%ef%bc%88right-join%ef%bc%89-zKFEmCtjpO\">3.2 \u53f3\u5916\u9023\u63a5\uff08RIGHT JOIN\uff09<\/h3>\n<pre><code>SELECT a.column1, b.column2\nFROM table_a a\nRIGHT JOIN table_b b ON a.id = b.a_id;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56detable_b\u4e2d\u7684\u6240\u6709\u8a18\u9304\uff0c\u5373\u4f7ftable_a\u4e2d\u6c92\u6709\u5c0d\u61c9\u7684\u8a18\u9304\u3002<\/p>\n<h2 id=\"4-%e4%ba%a4%e5%8f%89%e9%80%a3%e6%8e%a5%ef%bc%88cross-join%ef%bc%89-zKFEmCtjpO\">4. \u4ea4\u53c9\u9023\u63a5\uff08CROSS JOIN\uff09<\/h2>\n<p>\u4ea4\u53c9\u9023\u63a5\u8fd4\u56de\u5169\u500b\u8868\u7684\u7b1b\u5361\u723e\u7a4d\uff0c\u5373\u6bcf\u500b\u8868\u7684\u6bcf\u4e00\u884c\u90fd\u8207\u53e6\u4e00\u500b\u8868\u7684\u6bcf\u4e00\u884c\u76f8\u7d50\u5408\u3002\u9019\u7a2e\u9023\u63a5\u65b9\u5f0f\u901a\u5e38\u4e0d\u5e38\u7528\uff0c\u56e0\u70ba\u7d50\u679c\u96c6\u53ef\u80fd\u975e\u5e38\u9f90\u5927\u3002<\/p>\n<pre><code>SELECT a.column1, b.column2\nFROM table_a a\nCROSS JOIN table_b b;<\/code><\/pre>\n<h2 id=\"5-%e8%87%aa%e9%80%a3%e6%8e%a5%ef%bc%88self-join%ef%bc%89-zKFEmCtjpO\">5. \u81ea\u9023\u63a5\uff08SELF JOIN\uff09<\/h2>\n<p>\u81ea\u9023\u63a5\u662f\u6307\u4e00\u500b\u8868\u8207\u81ea\u8eab\u9032\u884c\u9023\u63a5\uff0c\u901a\u5e38\u7528\u65bc\u67e5\u8a62\u5c64\u7d1a\u7d50\u69cb\u6216\u95dc\u806f\u6578\u64da\u3002<\/p>\n<pre><code>SELECT a.column1, b.column1\nFROM table_a a, table_a b\nWHERE a.id = b.parent_id;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u53ef\u4ee5\u7528\u4f86\u67e5\u627e\u67d0\u500b\u5c64\u7d1a\u7d50\u69cb\u4e2d\u7684\u7236\u5b50\u95dc\u4fc2\u3002<\/p>\n<h2 id=\"6-%e4%bd%bf%e7%94%a8%e9%80%a3%e6%8e%a5%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-zKFEmCtjpO\">6. \u4f7f\u7528\u9023\u63a5\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u78ba\u4fdd\u9023\u63a5\u689d\u4ef6\u6b63\u78ba\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u91cd\u8907\u3002<\/li>\n<li>\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u4f7f\u7528\u9023\u63a5\u6642\uff0c\u6ce8\u610f\u6027\u80fd\u554f\u984c\uff0c\u5fc5\u8981\u6642\u8003\u616e\u4f7f\u7528\u7d22\u5f15\u3002<\/li>\n<li>\u4e86\u89e3\u4e0d\u540c\u9023\u63a5\u65b9\u5f0f\u7684\u7279\u6027\uff0c\u4ee5\u9078\u64c7\u6700\u5408\u9069\u7684\u9023\u63a5\u65b9\u5f0f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-zKFEmCtjpO\">\u7e3d\u7d50<\/h2>\n<p>Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u8868\u9023\u63a5\u65b9\u5f0f\uff0c\u8b93\u7528\u6236\u80fd\u5920\u9748\u6d3b\u5730\u67e5\u8a62\u548c\u7d44\u5408\u6578\u64da\u3002\u7121\u8ad6\u662f\u5167\u9023\u63a5\u3001\u5916\u9023\u63a5\u9084\u662f\u4ea4\u53c9\u9023\u63a5\uff0c\u4e86\u89e3\u5176\u7528\u6cd5\u548c\u7279\u6027\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u9700\u8981\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u6578\u64da\u5eab\u8868\u9023\u63a5\u65b9\u5f0f\u53ca\u5176\u5e38\u898b\u7528\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6578\u64da\u7ba1\u7406\u7b56\u7565\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-95542","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95542","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=95542"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95542\/revisions"}],"predecessor-version":[{"id":95543,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95542\/revisions\/95543"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95542"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95542"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95542"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}