{"id":171347,"date":"2024-11-07T01:59:18","date_gmt":"2024-11-06T17:59:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/171347\/"},"modified":"2024-11-07T01:59:19","modified_gmt":"2024-11-06T17:59:19","slug":"%e6%b7%ba%e8%ab%87oracle%e4%b8%ad%e7%9a%84%e4%b8%89%e7%a8%aejoin%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/171347\/","title":{"rendered":"\u6dfa\u8ac7Oracle\u4e2d\u7684\u4e09\u7a2eJoin\u65b9\u6cd5"},"content":{"rendered":"

\u6dfa\u8ac7Oracle\u4e2d\u7684\u4e09\u7a2eJoin\u65b9\u6cd5<\/h1>\n

\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cJoin\u662f\u4e00\u7a2e\u7528\u65bc\u5f9e\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u8cc7\u6599\u7684\u6280\u8853\u3002Oracle\u8cc7\u6599\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2eJoin\u65b9\u6cd5\uff0c\u8b93\u4f7f\u7528\u8005\u80fd\u5920\u6839\u64da\u9700\u6c42\u9078\u64c7\u6700\u5408\u9069\u7684\u65b9\u5f0f\u4f86\u67e5\u8a62\u8cc7\u6599\u3002\u672c\u6587\u5c07\u63a2\u8a0eOracle\u4e2d\u7684\u4e09\u7a2e\u4e3b\u8981Join\u65b9\u6cd5\uff1a\u5167\u90e8\u9023\u63a5\uff08Inner Join\uff09\u3001\u5916\u90e8\u9023\u63a5\uff08Outer Join\uff09\u548c\u4ea4\u53c9\u9023\u63a5\uff08Cross Join\uff09\u3002<\/p>\n

1. \u5167\u90e8\u9023\u63a5\uff08Inner Join\uff09<\/h2>\n

\u5167\u90e8\u9023\u63a5\u662f\u6700\u5e38\u7528\u7684Join\u65b9\u6cd5\u4e4b\u4e00\u3002\u5b83\u53ea\u8fd4\u56de\u5728\u5169\u500b\u6216\u591a\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002\u7576\u4f7f\u7528\u5167\u90e8\u9023\u63a5\u6642\uff0c\u53ea\u6709\u7576\u9023\u63a5\u689d\u4ef6\u6210\u7acb\u6642\uff0c\u8cc7\u6599\u624d\u6703\u88ab\u9078\u53d6\u3002<\/p>\n

SELECT a.column1, b.column2\nFROM table_a a\nINNER JOIN table_b b ON a.common_column = b.common_column;<\/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\u76f8\u61c9\u7684\u8cc7\u6599\u884c\u3002<\/p>\n
2. \u5916\u90e8\u9023\u63a5\uff08Outer Join\uff09<\/h2>\n
\u5916\u90e8\u9023\u63a5\u5206\u70ba\u5de6\u5916\u90e8\u9023\u63a5\uff08Left Outer Join\uff09\u3001\u53f3\u5916\u90e8\u9023\u63a5\uff08Right Outer Join\uff09\u548c\u5168\u5916\u90e8\u9023\u63a5\uff08Full Outer Join\uff09\u3002\u9019\u7a2eJoin\u65b9\u6cd5\u4e0d\u50c5\u8fd4\u56de\u5339\u914d\u7684\u884c\uff0c\u9084\u6703\u8fd4\u56de\u5728\u4e00\u500b\u8868\u4e2d\u5b58\u5728\u4f46\u5728\u53e6\u4e00\u500b\u8868\u4e2d\u4e0d\u5b58\u5728\u7684\u884c\u3002<\/p>\n
2.1 \u5de6\u5916\u90e8\u9023\u63a5\uff08Left Outer Join\uff09<\/h3>\n
\u5de6\u5916\u90e8\u9023\u63a5\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5728\u53f3\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002\u5c0d\u65bc\u6c92\u6709\u5339\u914d\u7684\u884c\uff0c\u53f3\u8868\u7684\u6b04\u4f4d\u5c07\u986f\u793a\u70baNULL\u3002<\/p>\n
SELECT a.column1, b.column2\nFROM table_a a\nLEFT OUTER JOIN table_b b ON a.common_column = b.common_column;<\/code><\/pre>\n
2.2 \u53f3\u5916\u90e8\u9023\u63a5\uff08Right Outer Join\uff09<\/h3>\n
\u53f3\u5916\u90e8\u9023\u63a5\u5247\u662f\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5728\u5de6\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002\u5c0d\u65bc\u6c92\u6709\u5339\u914d\u7684\u884c\uff0c\u5de6\u8868\u7684\u6b04\u4f4d\u5c07\u986f\u793a\u70baNULL\u3002<\/p>\n
SELECT a.column1, b.column2\nFROM table_a a\nRIGHT OUTER JOIN table_b b ON a.common_column = b.common_column;<\/code><\/pre>\n
2.3 \u5168\u5916\u90e8\u9023\u63a5\uff08Full Outer Join\uff09<\/h3>\n
\u5168\u5916\u90e8\u9023\u63a5\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u7121\u8ad6\u662f\u5426\u6709\u5339\u914d\u7684\u884c\u3002\u5c0d\u65bc\u6c92\u6709\u5339\u914d\u7684\u884c\uff0c\u5c0d\u61c9\u7684\u6b04\u4f4d\u5c07\u986f\u793a\u70baNULL\u3002<\/p>\n
SELECT a.column1, b.column2\nFROM table_a a\nFULL OUTER JOIN table_b b ON a.common_column = b.common_column;<\/code><\/pre>\n
3. \u4ea4\u53c9\u9023\u63a5\uff08Cross Join\uff09<\/h2>\n
\u4ea4\u53c9\u9023\u63a5\u8fd4\u56de\u5169\u500b\u8868\u7684\u7b1b\u5361\u723e\u7a4d\uff0c\u5373\u6bcf\u4e00\u884c\u4f86\u81ea\u7b2c\u4e00\u500b\u8868\u90fd\u6703\u8207\u7b2c\u4e8c\u500b\u8868\u7684\u6bcf\u4e00\u884c\u9032\u884c\u914d\u5c0d\u3002\u9019\u7a2e\u65b9\u6cd5\u901a\u5e38\u4e0d\u5e38\u7528\uff0c\u56e0\u70ba\u5b83\u6703\u751f\u6210\u5927\u91cf\u7684\u8cc7\u6599\u884c\uff0c\u7279\u5225\u662f\u7576\u5169\u500b\u8868\u7684\u884c\u6578\u90fd\u5f88\u5927\u6642\u3002<\/p>\n
SELECT a.column1, b.column2\nFROM table_a a\nCROSS JOIN table_b b;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u7d50\u679c\u96c6\u5c07\u5305\u542btable_a<\/a>\u4e2d\u7684\u6bcf\u4e00\u884c\u8207table_b<\/a>\u4e2d\u7684\u6bcf\u4e00\u884c\u7684\u7d44\u5408\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728Oracle\u8cc7\u6599\u5eab\u4e2d\uff0c\u9078\u64c7\u5408\u9069\u7684Join\u65b9\u6cd5\u5c0d\u65bc\u6709\u6548\u5730\u6aa2\u7d22\u8cc7\u6599\u81f3\u95dc\u91cd\u8981\u3002\u5167\u90e8\u9023\u63a5\u9069\u5408\u65bc\u9700\u8981\u5339\u914d\u8cc7\u6599\u7684\u60c5\u6cc1\uff0c\u800c\u5916\u90e8\u9023\u63a5\u5247\u63d0\u4f9b\u4e86\u66f4\u5927\u7684\u9748\u6d3b\u6027\uff0c\u80fd\u5920\u8655\u7406\u4e0d\u5b8c\u5168\u5339\u914d\u7684\u60c5\u6cc1\u3002\u4ea4\u53c9\u9023\u63a5\u96d6\u7136\u4e0d\u5e38\u7528\uff0c\u4f46\u5728\u67d0\u4e9b\u7279\u5b9a\u60c5\u6cc1\u4e0b\u4e5f\u80fd\u767c\u63ee\u4f5c\u7528\u3002\u4e86\u89e3\u9019\u4e9bJoin\u65b9\u6cd5\u7684\u7279\u6027\u548c\u7528\u6cd5\uff0c\u5c07\u6709\u52a9\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u548c\u67e5\u8a62\u7684\u6548\u7387\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u9700\u6c42\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u6709\u95dc\u9999\u6e2fVPS<\/a>\u548c\u4f3a\u670d\u5668<\/a>\u7684\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22Oracle\u4e2d\u7684\u4e09\u7a2eJoin\u65b9\u6cd5\uff1a\u5167\u9023\u63a5\u3001\u5916\u9023\u63a5\u548c\u81ea\u9023\u63a5\uff0c\u4e86\u89e3\u5b83\u5011\u7684\u7279\u9ede\u53ca\u4f7f\u7528\u5834\u666f\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-171347","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171347","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=171347"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171347\/revisions"}],"predecessor-version":[{"id":171348,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171347\/revisions\/171348"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=171347"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=171347"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=171347"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}