{"id":143883,"date":"2024-11-01T02:03:18","date_gmt":"2024-10-31T18:03:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143883\/"},"modified":"2024-11-01T02:03:19","modified_gmt":"2024-10-31T18:03:19","slug":"sql-%e5%a6%82%e4%bd%95%e8%ae%80%e5%8f%96%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e6%9c%80%e5%be%8c%e4%b8%80%e8%a1%8c%e6%95%b8%e6%93%9a%ef%bc%9f-sql-%e8%ae%80%e5%8f%96%e6%9c%80%e5%be%8c%e4%b8%80","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143883\/","title":{"rendered":"SQL \u5982\u4f55\u8b80\u53d6\u6578\u64da\u5eab\u4e2d\u7684\u6700\u5f8c\u4e00\u884c\u6578\u64da\uff1f (sql \u8b80\u53d6\u6700\u5f8c\u4e00\u884c\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"sql-%e5%a6%82%e4%bd%95%e8%ae%80%e5%8f%96%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e6%9c%80%e5%be%8c%e4%b8%80%e8%a1%8c%e6%95%b8%e6%93%9a%ef%bc%9f-DgNylLBdwC\">SQL \u5982\u4f55\u8b80\u53d6\u6578\u64da\u5eab\u4e2d\u7684\u6700\u5f8c\u4e00\u884c\u6578\u64da\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u8b80\u53d6\u6700\u5f8c\u4e00\u884c\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u70ba\u4e86\u7372\u53d6\u6700\u65b0\u7684\u8a18\u9304\uff0c\u9084\u662f\u9032\u884c\u6578\u64da\u5206\u6790\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u67e5\u8a62\u6578\u64da\u5eab\u4e2d\u7684\u6700\u5f8c\u4e00\u884c\u6578\u64da\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728 SQL \u4e2d\u5982\u4f55\u5be6\u73fe\u9019\u4e00\u64cd\u4f5c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e7%90%86%e8%a7%a3%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e7%b5%90%e6%a7%8b-DgNylLBdwC\">\u7406\u89e3\u6578\u64da\u5eab\u7684\u7d50\u69cb<\/h2>\n<p>\u5728\u958b\u59cb\u4e4b\u524d\uff0c\u6211\u5011\u9700\u8981\u4e86\u89e3\u6578\u64da\u5eab\u7684\u7d50\u69cb\u3002\u6578\u64da\u5eab\u901a\u5e38\u7531\u591a\u500b\u8868\u7d44\u6210\uff0c\u6bcf\u500b\u8868\u5305\u542b\u591a\u884c\u6578\u64da\u3002\u6bcf\u4e00\u884c\u6578\u64da\u90fd\u53ef\u4ee5\u88ab\u8996\u70ba\u4e00\u500b\u8a18\u9304\uff0c\u800c\u6bcf\u4e00\u5217\u5247\u4ee3\u8868\u8a72\u8a18\u9304\u7684\u5c6c\u6027\u3002\u70ba\u4e86\u80fd\u5920\u6709\u6548\u5730\u8b80\u53d6\u6700\u5f8c\u4e00\u884c\u6578\u64da\uff0c\u6211\u5011\u9700\u8981\u78ba\u5b9a\u4e00\u500b\u80fd\u5920\u552f\u4e00\u6a19\u8b58\u6bcf\u4e00\u884c\u7684\u5217\uff0c\u901a\u5e38\u9019\u662f\u4e3b\u9375\uff08Primary Key\uff09\u6216\u6642\u9593\u6233\uff08Timestamp\uff09\u5217\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-sql-%e6%9f%a5%e8%a9%a2%e6%9c%80%e5%be%8c%e4%b8%80%e8%a1%8c%e6%95%b8%e6%93%9a-DgNylLBdwC\">\u4f7f\u7528 SQL \u67e5\u8a62\u6700\u5f8c\u4e00\u884c\u6578\u64da<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u8b80\u53d6\u6700\u5f8c\u4e00\u884c\u6578\u64da\u7684\u5e38\u898b\u65b9\u6cd5\u662f\u4f7f\u7528 <code>ORDER BY<\/code> \u5b50\u53e5\u7d50\u5408 <code>LIMIT<\/code> \u5b50\u53e5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684 SQL \u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-1%ef%bc%9a%e4%bd%bf%e7%94%a8%e4%b8%bb%e9%8d%b5-DgNylLBdwC\">\u793a\u4f8b 1\uff1a\u4f7f\u7528\u4e3b\u9375<\/h3>\n<pre><code>SELECT * FROM your_table\nORDER BY id DESC\nLIMIT 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>your_table<\/code> \u662f\u4f60\u8981\u67e5\u8a62\u7684\u8868\u540d\uff0c<code>id<\/code> \u662f\u4e3b\u9375\u5217\u3002\u9019\u500b\u67e5\u8a62\u5c07\u6839\u64da\u4e3b\u9375\u7684\u503c\u964d\u5e8f\u6392\u5217\uff0c\u4e26\u8fd4\u56de\u7b2c\u4e00\u689d\u8a18\u9304\uff0c\u5373\u6700\u5f8c\u4e00\u884c\u6578\u64da\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-2%ef%bc%9a%e4%bd%bf%e7%94%a8%e6%99%82%e9%96%93%e6%88%b3-DgNylLBdwC\">\u793a\u4f8b 2\uff1a\u4f7f\u7528\u6642\u9593\u6233<\/h3>\n<pre><code>SELECT * FROM your_table\nORDER BY created_at DESC\nLIMIT 1;<\/code><\/pre>\n<p>\u5982\u679c\u4f60\u7684\u8868\u4e2d\u6709\u4e00\u500b\u6642\u9593\u6233\u5217\uff08\u4f8b\u5982 <code>created_at<\/code>\uff09\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u9019\u500b\u5217\u4f86\u7372\u53d6\u6700\u65b0\u7684\u8a18\u9304\u3002\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u6839\u64da\u6642\u9593\u6233\u964d\u5e8f\u6392\u5217\uff0c\u4e26\u8fd4\u56de\u6700\u65b0\u7684\u4e00\u689d\u6578\u64da\u3002<\/p>\n<h2 id=\"%e8%80%83%e6%85%ae%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e7%89%b9%e6%80%a7-DgNylLBdwC\">\u8003\u616e\u6578\u64da\u5eab\u7684\u7279\u6027<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6578\u64da\u5eab\u7684\u7279\u6027\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u7684\u7d50\u679c\u3002\u4f8b\u5982\uff0c\u5728\u67d0\u4e9b\u6578\u64da\u5eab\u4e2d\uff0c\u884c\u7684\u63d2\u5165\u9806\u5e8f\u53ef\u80fd\u4e0d\u4e00\u5b9a\u8207\u4e3b\u9375\u7684\u9806\u5e8f\u76f8\u540c\u3002\u56e0\u6b64\uff0c\u4f7f\u7528\u4e3b\u9375\u6216\u6642\u9593\u6233\u4f86\u78ba\u5b9a\u6700\u5f8c\u4e00\u884c\u6578\u64da\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<h2 id=\"%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-DgNylLBdwC\">\u6027\u80fd\u8003\u91cf<\/h2>\n<p>\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\uff0c\u6027\u80fd\u53ef\u80fd\u6210\u70ba\u4e00\u500b\u554f\u984c\u3002\u4f7f\u7528 <code>ORDER BY<\/code> \u548c <code>LIMIT<\/code> \u7684\u67e5\u8a62\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\uff0c\u7279\u5225\u662f\u7576\u8868\u4e2d\u6709\u5927\u91cf\u6578\u64da\u6642\u3002\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u53ef\u4ee5\u8003\u616e\u5c0d\u4e3b\u9375\u6216\u6642\u9593\u6233\u5217\u5efa\u7acb\u7d22\u5f15\uff0c\u9019\u6a23\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-DgNylLBdwC\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL \u4e2d\u8b80\u53d6\u6578\u64da\u5eab\u4e2d\u7684\u6700\u5f8c\u4e00\u884c\u6578\u64da\u662f\u4e00\u500b\u76f8\u5c0d\u7c21\u55ae\u7684\u64cd\u4f5c\uff0c\u901a\u5e38\u53ef\u4ee5\u901a\u904e <code>ORDER BY<\/code> \u548c <code>LIMIT<\/code> \u5b50\u53e5\u4f86\u5be6\u73fe\u3002\u7121\u8ad6\u662f\u4f7f\u7528\u4e3b\u9375\u9084\u662f\u6642\u9593\u6233\uff0c\u9078\u64c7\u5408\u9069\u7684\u5217\u4f86\u6392\u5e8f\u662f\u95dc\u9375\u3002\u6b64\u5916\uff0c\u8003\u616e\u5230\u6027\u80fd\u554f\u984c\uff0c\u5c0d\u76f8\u95dc\u5217\u5efa\u7acb\u7d22\u5f15\u4e5f\u662f\u4e00\u500b\u660e\u667a\u7684\u9078\u64c7\u3002<\/p>\n<p>\u5982\u679c\u4f60\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u4f60\u7684\u6578\u64da\u5eab\u64cd\u4f5c\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u4f60\u8f15\u9b06\u7ba1\u7406\u548c\u64f4\u5c55\u4f60\u7684\u6578\u64da\u5eab\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4f7f\u7528 SQL \u67e5\u8a62\u5f9e\u6578\u64da\u5eab\u4e2d\u8b80\u53d6\u6700\u5f8c\u4e00\u884c\u6578\u64da\uff0c\u638c\u63e1\u6709\u6548\u7684\u6578\u64da\u6aa2\u7d22\u6280\u5de7\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-143883","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143883","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=143883"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143883\/revisions"}],"predecessor-version":[{"id":143884,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143883\/revisions\/143884"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143883"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143883"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}