{"id":183344,"date":"2024-11-10T04:02:22","date_gmt":"2024-11-09T20:02:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/183344\/"},"modified":"2024-11-10T04:02:23","modified_gmt":"2024-11-09T20:02:23","slug":"%e5%af%a6%e7%8f%be%e5%85%a7%e5%ae%b9%e7%9a%84%e6%99%82%e9%96%93%e4%ba%a4%e9%9b%86%e8%a8%88%e7%ae%97%e7%9a%84sql%e8%aa%9e%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/183344\/","title":{"rendered":"\u5be6\u73fe\u5167\u5bb9\u7684\u6642\u9593\u4ea4\u96c6\u8a08\u7b97\u7684sql\u8a9e\u53e5"},"content":{"rendered":"<h1 id=\"%e5%af%a6%e7%8f%be%e5%85%a7%e5%ae%b9%e7%9a%84%e6%99%82%e9%96%93%e4%ba%a4%e9%9b%86%e8%a8%88%e7%ae%97%e7%9a%84sql%e8%aa%9e%e5%8f%a5-TsCzddFKOB\">\u5be6\u73fe\u5167\u5bb9\u7684\u6642\u9593\u4ea4\u96c6\u8a08\u7b97\u7684SQL\u8a9e\u53e5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6642\u9593\u4ea4\u96c6\u8a08\u7b97\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\uff0c\u5c24\u5176\u662f\u5728\u8655\u7406\u4e8b\u4ef6\u3001\u9810\u7d04\u6216\u4efb\u4f55\u9700\u8981\u6642\u9593\u7bc4\u570d\u7684\u6578\u64da\u6642\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528SQL\u8a9e\u53e5\u4f86\u5be6\u73fe\u5167\u5bb9\u7684\u6642\u9593\u4ea4\u96c6\u8a08\u7b97\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u7bc4\u4f8b\u548c\u89e3\u91cb\u3002<\/p>\n<h2 id=\"%e6%99%82%e9%96%93%e4%ba%a4%e9%9b%86%e7%9a%84%e6%a6%82%e5%bf%b5-TsCzddFKOB\">\u6642\u9593\u4ea4\u96c6\u7684\u6982\u5ff5<\/h2>\n<p>\u6642\u9593\u4ea4\u96c6\u662f\u6307\u5169\u500b\u6216\u591a\u500b\u6642\u9593\u7bc4\u570d\u4e4b\u9593\u7684\u91cd\u758a\u90e8\u5206\u3002\u8209\u4f8b\u4f86\u8aaa\uff0c\u5047\u8a2d\u6709\u5169\u500b\u4e8b\u4ef6\uff0c\u4e8b\u4ef6A\u7684\u6642\u9593\u7bc4\u570d\u662f\u5f9e2023\u5e741\u67081\u65e5\u52302023\u5e741\u67085\u65e5\uff0c\u800c\u4e8b\u4ef6B\u7684\u6642\u9593\u7bc4\u570d\u662f\u5f9e2023\u5e741\u67083\u65e5\u52302023\u5e741\u67087\u65e5\u3002\u9019\u5169\u500b\u4e8b\u4ef6\u7684\u4ea4\u96c6\u6642\u9593\u7bc4\u570d\u662f\u5f9e2023\u5e741\u67083\u65e5\u52302023\u5e741\u67085\u65e5\u3002<\/p>\n<h2 id=\"sql%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e7%b5%90%e6%a7%8b-TsCzddFKOB\">SQL\u8a9e\u53e5\u7684\u57fa\u672c\u7d50\u69cb<\/h2>\n<p>\u5728SQL\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u689d\u4ef6\u8a9e\u53e5\u4f86\u8a08\u7b97\u6642\u9593\u4ea4\u96c6\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u57fa\u672c\u7684SQL\u67e5\u8a62\u7bc4\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>events<\/code>\u7684\u8868\u683c\uff0c\u8a72\u8868\u683c\u5305\u542b\u4e8b\u4ef6\u7684\u958b\u59cb\u6642\u9593\u548c\u7d50\u675f\u6642\u9593\uff1a<\/p>\n<pre><code>SELECT \n    GREATEST(event_a.start_time, event_b.start_time) AS intersection_start,\n    LEAST(event_a.end_time, event_b.end_time) AS intersection_end\nFROM \n    events AS event_a\nJOIN \n    events AS event_b \nON \n    event_a.id != event_b.id\nWHERE \n    event_a.start_time &lt;= event_b.end_time \n    AND event_a.end_time &gt;= event_b.start_time;<\/code><\/pre>\n<h2 id=\"sql%e8%aa%9e%e5%8f%a5%e8%a7%a3%e6%9e%90-TsCzddFKOB\">SQL\u8a9e\u53e5\u89e3\u6790<\/h2>\n<p>\u5728\u4e0a\u8ff0SQL\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86\u4ee5\u4e0b\u5e7e\u500b\u95dc\u9375\u51fd\u6578\uff1a<\/p>\n<ul>\n<li><code>GREATEST()<\/code>\uff1a\u6b64\u51fd\u6578\u8fd4\u56de\u591a\u500b\u503c\u4e2d\u7684\u6700\u5927\u503c\u3002\u5728\u9019\u88e1\uff0c\u6211\u5011\u7528\u5b83\u4f86\u7372\u53d6\u4ea4\u96c6\u7684\u958b\u59cb\u6642\u9593\u3002<\/li>\n<li><code>LEAST()<\/code>\uff1a\u6b64\u51fd\u6578\u8fd4\u56de\u591a\u500b\u503c\u4e2d\u7684\u6700\u5c0f\u503c\uff0c\u7528\u65bc\u7372\u53d6\u4ea4\u96c6\u7684\u7d50\u675f\u6642\u9593\u3002<\/li>\n<li><code>JOIN<\/code>\uff1a\u6211\u5011\u4f7f\u7528\u81ea\u9023\u63a5\u4f86\u6bd4\u8f03\u540c\u4e00\u8868\u683c\u4e2d\u7684\u4e0d\u540c\u4e8b\u4ef6\u3002<\/li>\n<li><code>WHERE<\/code>\uff1a\u6b64\u689d\u4ef6\u78ba\u4fdd\u6211\u5011\u53ea\u9078\u64c7\u90a3\u4e9b\u6709\u91cd\u758a\u7684\u4e8b\u4ef6\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%af%84%e4%be%8b%e6%95%b8%e6%93%9a-TsCzddFKOB\">\u7bc4\u4f8b\u6578\u64da<\/h2>\n<p>\u70ba\u4e86\u66f4\u597d\u5730\u7406\u89e3\u9019\u500b\u67e5\u8a62\uff0c\u6211\u5011\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u7bc4\u4f8b\u6578\u64da\uff1a<\/p>\n<pre><code>CREATE TABLE events (\n    id INT PRIMARY KEY,\n    start_time DATETIME,\n    end_time DATETIME\n);\n\nINSERT INTO events (id, start_time, end_time) VALUES\n(1, '2023-01-01 00:00:00', '2023-01-05 23:59:59'),\n(2, '2023-01-03 00:00:00', '2023-01-07 23:59:59'),\n(3, '2023-01-06 00:00:00', '2023-01-10 23:59:59');<\/code><\/pre>\n<p>\u57f7\u884c\u4e0a\u8ff0\u67e5\u8a62\u5f8c\uff0c\u5c07\u8fd4\u56de\u4e8b\u4ef61\u548c\u4e8b\u4ef62\u7684\u4ea4\u96c6\u6642\u9593\u7bc4\u570d\uff0c\u5373\u5f9e2023\u5e741\u67083\u65e5\u52302023\u5e741\u67085\u65e5\u3002<\/p>\n<h2 id=\"%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-TsCzddFKOB\">\u5be6\u969b\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u6642\u9593\u4ea4\u96c6\u8a08\u7b97\u5728\u8a31\u591a\u61c9\u7528\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u91cd\u8981\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u9810\u7d04\u7cfb\u7d71\uff1a\u78ba\u4fdd\u4e0d\u6703\u6709\u91cd\u758a\u7684\u9810\u7d04\u6642\u9593\u3002<\/li>\n<li>\u4e8b\u4ef6\u7ba1\u7406\uff1a\u7ba1\u7406\u591a\u500b\u4e8b\u4ef6\u7684\u6642\u9593\u5b89\u6392\uff0c\u907f\u514d\u885d\u7a81\u3002<\/li>\n<li>\u8cc7\u6e90\u5206\u914d\uff1a\u5728\u8cc7\u6e90\u6709\u9650\u7684\u60c5\u6cc1\u4e0b\uff0c\u5408\u7406\u5b89\u6392\u4f7f\u7528\u6642\u9593\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-TsCzddFKOB\">\u7e3d\u7d50<\/h2>\n<p>\u901a\u904e\u4f7f\u7528SQL\u8a9e\u53e5\uff0c\u6211\u5011\u53ef\u4ee5\u6709\u6548\u5730\u8a08\u7b97\u6642\u9593\u4ea4\u96c6\uff0c\u9019\u5728\u8a31\u591a\u696d\u52d9\u5834\u666f\u4e2d\u90fd\u662f\u4e00\u500b\u91cd\u8981\u7684\u529f\u80fd\u3002\u7121\u8ad6\u662f\u9810\u7d04\u7cfb\u7d71\u9084\u662f\u4e8b\u4ef6\u7ba1\u7406\uff0c\u638c\u63e1\u9019\u7a2e\u6280\u8853\u90fd\u80fd\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u6280\u8853\u652f\u6301\u6216\u5c0b\u627e\u5408\u9069\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a 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