{"id":95954,"date":"2024-10-20T05:23:15","date_gmt":"2024-10-19T21:23:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95954\/"},"modified":"2024-10-20T05:23:16","modified_gmt":"2024-10-19T21:23:16","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e8%a1%a8%e7%9a%84%e4%b8%8d%e5%90%8c%e7%9a%84%e9%80%a3%e6%8e%a5%e6%96%b9%e5%bc%8f%e6%8f%8f%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95954\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\u4e2d\u8868\u7684\u4e0d\u540c\u7684\u9023\u63a5\u65b9\u5f0f\u63cf\u8ff0"},"content":{"rendered":"

Oracle\u6578\u64da\u5eab\u4e2d\u8868\u7684\u4e0d\u540c\u7684\u9023\u63a5\u65b9\u5f0f\u63cf\u8ff0<\/h1>\n

\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u8868\u7684\u9023\u63a5\u65b9\u5f0f\u662f\u6578\u64da\u5eab\u8a2d\u8a08\u548c\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u56e0\u7d20\u3002\u6b63\u78ba\u7684\u9023\u63a5\u65b9\u5f0f\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u9084\u80fd\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u672c\u6587\u5c07\u63a2\u8a0eOracle\u6578\u64da\u5eab\u4e2d\u8868\u7684\u4e0d\u540c\u9023\u63a5\u65b9\u5f0f\uff0c\u5305\u62ec\u5167\u9023\u63a5\u3001\u5916\u9023\u63a5\u3001\u4ea4\u53c9\u9023\u63a5\u548c\u81ea\u9023\u63a5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n

1. \u5167\u9023\u63a5 (INNER JOIN)<\/h2>\n

\u5167\u9023\u63a5\u662f\u6700\u5e38\u7528\u7684\u9023\u63a5\u65b9\u5f0f\uff0c\u5b83\u53ea\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002\u7576\u67e5\u8a62\u4e2d\u6307\u5b9a\u7684\u689d\u4ef6\u6eff\u8db3\u6642\uff0c\u5167\u9023\u63a5\u6703\u5c07\u9019\u4e9b\u884c\u5408\u4f75\u5728\u4e00\u8d77\u3002<\/p>\n

\nSELECT a.column1, b.column2\nFROM table_a a\nINNER JOIN table_b b ON a.common_column = b.common_column;\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u53ea\u6709\u7576table_a<\/a>\u548ctable_b<\/a>\u4e2d\u7684common_column<\/code>\u76f8\u7b49\u6642\uff0c\u624d\u6703\u8fd4\u56de\u7d50\u679c\u3002<\/p>\n
2. \u5916\u9023\u63a5 (OUTER JOIN)<\/h2>\n
\u5916\u9023\u63a5\u5206\u70ba\u5de6\u5916\u9023\u63a5\u3001\u53f3\u5916\u9023\u63a5\u548c\u5168\u5916\u9023\u63a5\u3002\u5b83\u5011\u7684\u4e3b\u8981\u7279\u9ede\u662f\u5373\u4f7f\u5728\u4e00\u500b\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\uff0c\u4ecd\u7136\u6703\u8fd4\u56de\u53e6\u4e00\u500b\u8868\u4e2d\u7684\u6240\u6709\u884c\u3002<\/p>\n
2.1 \u5de6\u5916\u9023\u63a5 (LEFT OUTER JOIN)<\/h3>\n
\u5de6\u5916\u9023\u63a5\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u53f3\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/p>\n
\nSELECT a.column1, b.column2\nFROM table_a a\nLEFT OUTER JOIN table_b b ON a.common_column = b.common_column;\n<\/code><\/pre>\n
2.2 \u53f3\u5916\u9023\u63a5 (RIGHT OUTER JOIN)<\/h3>\n
\u53f3\u5916\u9023\u63a5\u5247\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5de6\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/p>\n
\nSELECT a.column1, b.column2\nFROM table_a a\nRIGHT OUTER JOIN table_b b ON a.common_column = b.common_column;\n<\/code><\/pre>\n
2.3 \u5168\u5916\u9023\u63a5 (FULL OUTER JOIN)<\/h3>\n
\u5168\u5916\u9023\u63a5\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u7121\u8ad6\u662f\u5426\u6709\u5339\u914d\u7684\u884c\u3002<\/p>\n
\nSELECT a.column1, b.column2\nFROM table_a a\nFULL OUTER JOIN table_b b ON a.common_column = b.common_column;\n<\/code><\/pre>\n
3. \u4ea4\u53c9\u9023\u63a5 (CROSS JOIN)<\/h2>\n
\u4ea4\u53c9\u9023\u63a5\u8fd4\u56de\u5169\u500b\u8868\u7684\u7b1b\u5361\u723e\u7a4d\uff0c\u5373\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\u5b83\u6703\u751f\u6210\u5927\u91cf\u7684\u7d50\u679c\u96c6\u3002<\/p>\n
\nSELECT a.column1, b.column2\nFROM table_a a\nCROSS JOIN table_b b;\n<\/code><\/pre>\n
4. \u81ea\u9023\u63a5 (SELF JOIN)<\/h2>\n
\u81ea\u9023\u63a5\u662f\u5c07\u540c\u4e00\u500b\u8868\u8207\u81ea\u8eab\u9032\u884c\u9023\u63a5\u3002\u9019\u5728\u9700\u8981\u6bd4\u8f03\u8868\u4e2d\u4e0d\u540c\u8a18\u9304\u6642\u975e\u5e38\u6709\u7528\u3002<\/p>\n
\nSELECT a.column1, b.column1\nFROM table_a a, table_a b\nWHERE a.id = b.parent_id;\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u8868table_a<\/a>\u88ab\u7528\u4f5c\u5169\u500b\u4e0d\u540c\u7684\u5be6\u4f8b\uff0c\u901a\u904eparent_id<\/code>\u9032\u884c\u9023\u63a5\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u9078\u64c7\u5408\u9069\u7684\u8868\u9023\u63a5\u65b9\u5f0f\u5c0d\u65bc\u6578\u64da\u67e5\u8a62\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u81f3\u95dc\u91cd\u8981\u3002\u5167\u9023\u63a5\u3001\u5916\u9023\u63a5\u3001\u4ea4\u53c9\u9023\u63a5\u548c\u81ea\u9023\u63a5\u5404\u6709\u5176\u7279\u9ede\u548c\u9069\u7528\u5834\u666f\u3002\u4e86\u89e3\u9019\u4e9b\u9023\u63a5\u65b9\u5f0f\u7684\u4f7f\u7528\u60c5\u5883\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u597d\u5730\u8a2d\u8a08\u6578\u64da\u5eab\u7d50\u69cb\u548c\u512a\u5316\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u9999\u6e2fVPS<\/a>\u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22Oracle\u6578\u64da\u5eab\u4e2d\u8868\u7684\u4e0d\u540c\u9023\u63a5\u65b9\u5f0f\uff0c\u5305\u62ec\u5167\u9023\u63a5\u3001\u5916\u9023\u63a5\u548c\u4ea4\u53c9\u9023\u63a5\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\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-95954","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95954","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=95954"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95954\/revisions"}],"predecessor-version":[{"id":95955,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95954\/revisions\/95955"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95954"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95954"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95954"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}