{"id":172835,"date":"2024-11-07T15:28:19","date_gmt":"2024-11-07T07:28:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/172835\/"},"modified":"2024-11-07T15:28:20","modified_gmt":"2024-11-07T07:28:20","slug":"%e5%a6%82%e4%bd%95%e6%9f%a5%e8%a9%a2%e6%9c%80%e6%96%b0%e6%97%a5%e6%9c%9f%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%98%e9%8c%84-%e6%9f%a5%e8%a9%a2%e6%9c%80%e6%96%b0%e6%97%a5%e6%9c%9f%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/172835\/","title":{"rendered":"\u5982\u4f55\u67e5\u8a62\u6700\u65b0\u65e5\u671f\u7684\u6578\u64da\u5eab\u8a18\u9304 (\u67e5\u8a62\u6700\u65b0\u65e5\u671f\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e6%9f%a5%e8%a9%a2%e6%9c%80%e6%96%b0%e6%97%a5%e6%9c%9f%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%98%e9%8c%84-%e6%9f%a5%e8%a9%a2%e6%9c%80%e6%96%b0%e6%97%a5%e6%9c%9f%e6%95%b8%e6%93%9a-wdKSkfhynL\">\u5982\u4f55\u67e5\u8a62\u6700\u65b0\u65e5\u671f\u7684\u6578\u64da\u5eab\u8a18\u9304 (\u67e5\u8a62\u6700\u65b0\u65e5\u671f\u6578\u64da\u5eab)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u67e5\u8a62\u6700\u65b0\u65e5\u671f\u7684\u8a18\u9304\u662f\u4e00\u9805\u5e38\u898b\u4e14\u91cd\u8981\u7684\u4efb\u52d9\u3002\u7121\u8ad6\u662f\u7528\u65bc\u6578\u64da\u5206\u6790\u3001\u5831\u544a\u751f\u6210\uff0c\u9084\u662f\u7cfb\u7d71\u76e3\u63a7\uff0c\u80fd\u5920\u5feb\u901f\u7372\u53d6\u6700\u65b0\u7684\u6578\u64da\u5c0d\u65bc\u696d\u52d9\u904b\u71df\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u67e5\u8a62\u6700\u65b0\u65e5\u671f\u7684\u8a18\u9304\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%ad%e8%a8%88%e8%80%83%e9%87%8f-wdKSkfhynL\">\u6578\u64da\u5eab\u8a2d\u8a08\u8003\u91cf<\/h2>\n<p>\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u61c9\u8003\u616e\u5982\u4f55\u6709\u6548\u5730\u5b58\u5132\u548c\u6aa2\u7d22\u65e5\u671f\u4fe1\u606f\u3002\u901a\u5e38\uff0c\u65e5\u671f\u5b57\u6bb5\u6703\u4f7f\u7528\u6a19\u6e96\u7684\u65e5\u671f\u6642\u9593\u683c\u5f0f\uff08\u5982DATETIME\u6216TIMESTAMP\uff09\u4f86\u5b58\u5132\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5728\u67e5\u8a62\u6642\u80fd\u5920\u6b63\u78ba\u5730\u9032\u884c\u6bd4\u8f03\u548c\u6392\u5e8f\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e6%9c%80%e6%96%b0%e6%97%a5%e6%9c%9f%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%96%b9%e6%b3%95-wdKSkfhynL\">\u67e5\u8a62\u6700\u65b0\u65e5\u671f\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>\u67e5\u8a62\u6700\u65b0\u65e5\u671f\u7684\u8a18\u9304\u901a\u5e38\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\u5be6\u73fe\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528ORDER BY\u5b50\u53e5\u9032\u884c\u6392\u5e8f<\/li>\n<li>\u4f7f\u7528LIMIT\u9650\u5236\u8fd4\u56de\u7684\u8a18\u9304\u6578<\/li>\n<li>\u4f7f\u7528\u805a\u5408\u51fd\u6578\u5982MAX()\u4f86\u7372\u53d6\u6700\u65b0\u65e5\u671f<\/li>\n<\/ul>\n<h3 id=\"%e4%bd%bf%e7%94%a8order-by%e5%92%8climit-wdKSkfhynL\">\u4f7f\u7528ORDER BY\u548cLIMIT<\/h3>\n<p>\u9019\u662f\u4e00\u7a2e\u6700\u5e38\u898b\u7684\u65b9\u6cd5\uff0c\u901a\u904e\u5c0d\u65e5\u671f\u5b57\u6bb5\u9032\u884c\u6392\u5e8f\uff0c\u7136\u5f8c\u9650\u5236\u8fd4\u56de\u7684\u8a18\u9304\u6578\u91cf\u4f86\u7372\u53d6\u6700\u65b0\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5728MySQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM your_table\nORDER BY date_column DESC\nLIMIT 1;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u8fd4\u56de\u65e5\u671f\u5b57\u6bb5\u4e2d\u6700\u65b0\u7684\u4e00\u689d\u8a18\u9304\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8max%e5%87%bd%e6%95%b8-wdKSkfhynL\">\u4f7f\u7528MAX()\u51fd\u6578<\/h3>\n<p>\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528\u805a\u5408\u51fd\u6578MAX()\u4f86\u7372\u53d6\u6700\u65b0\u7684\u65e5\u671f\uff0c\u7136\u5f8c\u518d\u6839\u64da\u9019\u500b\u65e5\u671f\u67e5\u8a62\u76f8\u95dc\u7684\u8a18\u9304\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM your_table\nWHERE date_column = (SELECT MAX(date_column) FROM your_table);<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u65e5\u671f\u7b49\u65bc\u6700\u65b0\u65e5\u671f\u7684\u8a18\u9304\uff0c\u9019\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u6703\u8fd4\u56de\u591a\u689d\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e4%b8%8d%e5%90%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b3%bb%e7%b5%b1%e7%9a%84%e6%9f%a5%e8%a9%a2%e7%a4%ba%e4%be%8b-wdKSkfhynL\">\u4e0d\u540c\u6578\u64da\u5eab\u7cfb\u7d71\u7684\u67e5\u8a62\u793a\u4f8b<\/h2>\n<h3 id=\"mysql-wdKSkfhynL\">MySQL<\/h3>\n<p>\u5728MySQL\u4e2d\uff0c\u67e5\u8a62\u6700\u65b0\u65e5\u671f\u7684\u8a18\u9304\u53ef\u4ee5\u4f7f\u7528\u4e0a\u8ff0\u7684ORDER BY\u548cLIMIT\u65b9\u6cd5\uff0c\u6216\u8005\u4f7f\u7528MAX()\u51fd\u6578\u3002\u4ee5\u4e0b\u662f\u5b8c\u6574\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM orders\nORDER BY order_date DESC\nLIMIT 1;<\/code><\/pre>\n<h3 id=\"postgresql-wdKSkfhynL\">PostgreSQL<\/h3>\n<p>\u5728PostgreSQL\u4e2d\uff0c\u67e5\u8a62\u7684\u8a9e\u6cd5\u8207MySQL\u76f8\u4f3c\uff1a<\/p>\n<pre><code>SELECT * FROM orders\nORDER BY order_date DESC\nLIMIT 1;<\/code><\/pre>\n<h3 id=\"sql-server-wdKSkfhynL\">SQL Server<\/h3>\n<p>\u5728SQL Server\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528TOP\u95dc\u9375\u5b57\u4f86\u9650\u5236\u8fd4\u56de\u7684\u8a18\u9304\u6578\uff1a<\/p>\n<pre><code>SELECT TOP 1 * FROM orders\nORDER BY order_date DESC;<\/code><\/pre>\n<h2 id=\"%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-wdKSkfhynL\">\u6027\u80fd\u8003\u91cf<\/h2>\n<p>\u5728\u67e5\u8a62\u6700\u65b0\u65e5\u671f\u7684\u8a18\u9304\u6642\uff0c\u6027\u80fd\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\u56e0\u7d20\u3002\u5c0d\u65bc\u5927\u578b\u6578\u64da\u96c6\uff0c\u5efa\u8b70\u5728\u65e5\u671f\u5b57\u6bb5\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u9019\u6a23\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6240\u9700\u7684\u6642\u9593\uff0c\u7279\u5225\u662f\u5728\u6578\u64da\u91cf\u9f90\u5927\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-wdKSkfhynL\">\u7d50\u8ad6<\/h2>\n<p>\u67e5\u8a62\u6700\u65b0\u65e5\u671f\u7684\u6578\u64da\u5eab\u8a18\u9304\u662f\u4e00\u9805\u57fa\u672c\u4f46\u91cd\u8981\u7684\u6280\u80fd\u3002\u901a\u904e\u4f7f\u7528\u9069\u7576\u7684SQL\u67e5\u8a62\u8a9e\u6cd5\u548c\u8003\u616e\u6027\u80fd\u512a\u5316\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002\u7121\u8ad6\u60a8\u4f7f\u7528\u7684\u662fMySQL\u3001PostgreSQL\u9084\u662fSQL Server\uff0c\u638c\u63e1\u9019\u4e9b\u67e5\u8a62\u6280\u5de7\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u60a8\u7684\u6578\u64da\u7ba1\u7406\u80fd\u529b\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5b58\u5132\u9084\u662f\u61c9\u7528\u90e8\u7f72\uff0c\u9078\u64c7\u5408\u9069\u7684\u670d\u52d9\u5668\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u60a8\u7684\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u67e5\u8a62\u6578\u64da\u5eab\u4e2d\u6700\u65b0\u65e5\u671f\u7684\u8a18\u9304\uff0c\u638c\u63e1\u6709\u6548\u7684\u67e5\u8a62\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\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-172835","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172835","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=172835"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172835\/revisions"}],"predecessor-version":[{"id":172836,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172835\/revisions\/172836"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=172835"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=172835"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=172835"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}