{"id":96006,"date":"2024-10-20T05:49:16","date_gmt":"2024-10-19T21:49:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96006\/"},"modified":"2024-10-20T05:49:16","modified_gmt":"2024-10-19T21:49:16","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e8%a1%8c%e8%bd%89%e5%88%97%e4%bb%a5%e5%8f%8ajoin%e7%94%a8%e6%b3%95%e7%b8%bd%e7%b5%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96006\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\u4e2d\u884c\u8f49\u5217\u4ee5\u53caJOIN\u7528\u6cd5\u7e3d\u7d50"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e8%a1%8c%e8%bd%89%e5%88%97%e4%bb%a5%e5%8f%8ajoin%e7%94%a8%e6%b3%95%e7%b8%bd%e7%b5%90-ykPNRcSWGh\">Oracle\u6578\u64da\u5eab\u4e2d\u884c\u8f49\u5217\u4ee5\u53caJOIN\u7528\u6cd5\u7e3d\u7d50<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u884c\u8f49\u5217\uff08Pivot\uff09\u548cJOIN\u64cd\u4f5c\u662f\u5169\u500b\u975e\u5e38\u91cd\u8981\u7684\u6982\u5ff5\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0eOracle\u6578\u64da\u5eab\u4e2d\u884c\u8f49\u5217\u7684\u5be6\u73fe\u65b9\u6cd5\u4ee5\u53caJOIN\u7684\u7528\u6cd5\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u9019\u4e9b\u6280\u8853\u5728\u6578\u64da\u8655\u7406\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e8%a1%8c%e8%bd%89%e5%88%97%ef%bc%88pivot%ef%bc%89-ykPNRcSWGh\">\u884c\u8f49\u5217\uff08Pivot\uff09<\/h2>\n<p>\u884c\u8f49\u5217\u662f\u4e00\u7a2e\u5c07\u884c\u6578\u64da\u8f49\u63db\u70ba\u5217\u6578\u64da\u7684\u6280\u8853\uff0c\u901a\u5e38\u7528\u65bc\u5831\u544a\u548c\u6578\u64da\u5206\u6790\u4e2d\u3002Oracle\u63d0\u4f9b\u4e86PIVOT\u548cUNPIVOT\u64cd\u4f5c\u4f86\u5be6\u73fe\u9019\u4e00\u529f\u80fd\u3002<\/p>\n<h3 id=\"pivot%e8%aa%9e%e6%b3%95-ykPNRcSWGh\">PIVOT\u8a9e\u6cd5<\/h3>\n<p>PIVOT\u64cd\u4f5c\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nSELECT * \nFROM \n    (SELECT column1, column2, column3 \n     FROM your_table) \nPIVOT \n    (SUM(column3) \n     FOR column2 IN (value1, value2, value3));\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0ccolumn2\u7684\u4e0d\u540c\u503c\u5c07\u6210\u70ba\u65b0\u7684\u5217\uff0c\u800ccolumn3\u7684\u503c\u5c07\u6839\u64da\u9019\u4e9b\u5217\u9032\u884c\u805a\u5408\u3002\u9019\u6a23\u53ef\u4ee5\u65b9\u4fbf\u5730\u67e5\u770b\u4e0d\u540c\u985e\u5225\u7684\u6578\u64da\u7e3d\u548c\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-ykPNRcSWGh\">\u793a\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6709\u4e00\u500b\u92b7\u552e\u6578\u64da\u8868\uff0c\u5305\u542b\u4ee5\u4e0b\u6578\u64da\uff1a<\/p>\n<pre><code>\n| \u92b7\u552e\u4eba\u54e1 | \u7522\u54c1   | \u92b7\u552e\u984d |\n|----------|--------|--------|\n| Alice    | A      | 100    |\n| Alice    | B      | 150    |\n| Bob      | A      | 200    |\n| Bob      | B      | 250    |\n<\/code><\/pre>\n<p>\u4f7f\u7528PIVOT\u64cd\u4f5c\uff0c\u6211\u5011\u53ef\u4ee5\u5c07\u9019\u4e9b\u6578\u64da\u8f49\u63db\u70ba\uff1a<\/p>\n<pre><code>\n| \u92b7\u552e\u4eba\u54e1 | A    | B    |\n|----------|------|------|\n| Alice    | 100  | 150  |\n| Bob      | 200  | 250  |\n<\/code><\/pre>\n<p>\u5c0d\u61c9\u7684SQL\u67e5\u8a62\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nSELECT * \nFROM \n    (SELECT \u92b7\u552e\u4eba\u54e1, \u7522\u54c1, \u92b7\u552e\u984d \n     FROM sales_data) \nPIVOT \n    (SUM(\u92b7\u552e\u984d) \n     FOR \u7522\u54c1 IN ('A' AS A, 'B' AS B));\n<\/code><\/pre>\n<h2 id=\"join%e6%93%8d%e4%bd%9c-ykPNRcSWGh\">JOIN\u64cd\u4f5c<\/h2>\n<p>JOIN\u64cd\u4f5c\u7528\u65bc\u5c07\u5169\u500b\u6216\u591a\u500b\u8868\u4e2d\u7684\u6578\u64da\u6839\u64da\u67d0\u4e9b\u689d\u4ef6\u9032\u884c\u9023\u63a5\u3002Oracle\u652f\u6301\u591a\u7a2eJOIN\u985e\u578b\uff0c\u5305\u62ecINNER JOIN\u3001LEFT JOIN\u3001RIGHT JOIN\u548cFULL OUTER JOIN\u3002<\/p>\n<h3 id=\"inner-join-ykPNRcSWGh\">INNER JOIN<\/h3>\n<p>INNER JOIN\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nSELECT a.column1, b.column2 \nFROM table1 a \nINNER JOIN table2 b \nON a.common_column = b.common_column;\n<\/code><\/pre>\n<h3 id=\"left-join-ykPNRcSWGh\">LEFT JOIN<\/h3>\n<p>LEFT JOIN\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u53f3\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nSELECT a.column1, b.column2 \nFROM table1 a \nLEFT JOIN table2 b \nON a.common_column = b.common_column;\n<\/code><\/pre>\n<h3 id=\"%e7%a4%ba%e4%be%8b-ykPNRcSWGh\">\u793a\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6709\u5169\u500b\u8868\uff1a\u5ba2\u6236\u8868\u548c\u8a02\u55ae\u8868\uff0c\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n<pre><code>\n\u5ba2\u6236\u8868\uff1a\n| \u5ba2\u6236ID | \u5ba2\u6236\u540d\u7a31 |\n|--------|----------|\n| 1      | Alice    |\n| 2      | Bob      |\n\n\u8a02\u55ae\u8868\uff1a\n| \u8a02\u55aeID | \u5ba2\u6236ID | \u7522\u54c1   |\n|--------|--------|--------|\n| 101    | 1      | A      |\n| 102    | 1      | B      |\n| 103    | 2      | A      |\n<\/code><\/pre>\n<p>\u4f7f\u7528INNER JOIN\u67e5\u8a62\u5ba2\u6236\u53ca\u5176\u8a02\u55ae\uff1a<\/p>\n<pre><code>\nSELECT c.\u5ba2\u6236\u540d\u7a31, o.\u7522\u54c1 \nFROM \u5ba2\u6236\u8868 c \nINNER JOIN \u8a02\u55ae\u8868 o \nON c.\u5ba2\u6236ID = o.\u5ba2\u6236ID;\n<\/code><\/pre>\n<p>\u7d50\u679c\u5c07\u986f\u793a\u6240\u6709\u6709\u8a02\u55ae\u7684\u5ba2\u6236\u53ca\u5176\u8a02\u55ae\u7522\u54c1\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ykPNRcSWGh\">\u7e3d\u7d50<\/h2>\n<p>\u884c\u8f49\u5217\u548cJOIN\u64cd\u4f5c\u662fOracle\u6578\u64da\u5eab\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u6578\u64da\u8655\u7406\u6280\u8853\u3002\u884c\u8f49\u5217\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u66f4\u76f4\u89c0\u5730\u67e5\u770b\u6578\u64da\uff0c\u800cJOIN\u5247\u80fd\u5920\u6709\u6548\u5730\u6574\u5408\u4f86\u81ea\u4e0d\u540c\u8868\u7684\u6578\u64da\u3002\u638c\u63e1\u9019\u4e9b\u6280\u8853\u5c0d\u65bc\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u751f\u6210\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u63d0\u4f9b\u7a69\u5b9a\u7684\u6578\u64da\u5eab\u904b\u884c\u74b0\u5883\uff0c\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7e3d\u7d50Oracle\u6578\u64da\u5eab\u4e2d\u884c\u8f49\u5217\u53caJOIN\u7528\u6cd5\uff0c\u63d0\u4f9b\u5be6\u7528\u6280\u5de7\u8207\u7bc4\u4f8b\uff0c\u52a9\u60a8\u9ad8\u6548\u8655\u7406\u6578\u64da\u67e5\u8a62\u8207\u5206\u6790\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-96006","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96006","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=96006"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96006\/revisions"}],"predecessor-version":[{"id":96007,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96006\/revisions\/96007"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96006"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96006"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96006"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}