{"id":143867,"date":"2024-11-01T01:55:18","date_gmt":"2024-10-31T17:55:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143867\/"},"modified":"2024-11-01T01:55:19","modified_gmt":"2024-10-31T17:55:19","slug":"sql-%e6%8e%92%e5%ba%8f%e8%aa%9e%e5%8f%a5%e8%a9%b3%e8%a7%a3%e8%88%87%e5%af%a6%e6%88%b0%e6%8c%87%e5%8d%97-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%8e%92%e5%ba%8f%e4%bb%a3%e7%a2%bc","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143867\/","title":{"rendered":"SQL \u6392\u5e8f\u8a9e\u53e5\u8a73\u89e3\u8207\u5be6\u6230\u6307\u5357 (sql \u6578\u64da\u5eab\u4e2d\u6392\u5e8f\u4ee3\u78bc)"},"content":{"rendered":"<h1 id=\"sql-%e6%8e%92%e5%ba%8f%e8%aa%9e%e5%8f%a5%e8%a9%b3%e8%a7%a3%e8%88%87%e5%af%a6%e6%88%b0%e6%8c%87%e5%8d%97-xaZULxncRr\">SQL \u6392\u5e8f\u8a9e\u53e5\u8a73\u89e3\u8207\u5be6\u6230\u6307\u5357<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6392\u5e8f\u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u64cd\u4f5c\u3002\u7121\u8ad6\u662f\u67e5\u8a62\u7d50\u679c\u7684\u53ef\u8b80\u6027\uff0c\u9084\u662f\u6578\u64da\u5206\u6790\u7684\u9700\u6c42\uff0c\u6392\u5e8f\u90fd\u80fd\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u6578\u64da\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e SQL \u4e2d\u7684\u6392\u5e8f\u8a9e\u53e5\uff0c\u5305\u62ec\u5176\u8a9e\u6cd5\u3001\u4f7f\u7528\u65b9\u6cd5\u53ca\u5be6\u969b\u6848\u4f8b\u3002<\/p>\n<h2 id=\"sql-%e6%8e%92%e5%ba%8f%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-xaZULxncRr\">SQL \u6392\u5e8f\u8a9e\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u6392\u5e8f\u4e3b\u8981\u901a\u904e <code>ORDER BY<\/code> \u5b50\u53e5\u4f86\u5be6\u73fe\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT column1, column2, ...\nFROM table_name\nORDER BY column1 [ASC|DESC], column2 [ASC|DESC], ...;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>column1<\/code> \u548c <code>column2<\/code> \u662f\u9700\u8981\u6392\u5e8f\u7684\u5217\u540d\u3002<code>ASC<\/code> \u8868\u793a\u5347\u5e8f\uff08\u9ed8\u8a8d\uff09\uff0c\u800c <code>DESC<\/code> \u8868\u793a\u964d\u5e8f\u3002<\/p>\n<h2 id=\"%e6%8e%92%e5%ba%8f%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8-xaZULxncRr\">\u6392\u5e8f\u7684\u5be6\u969b\u61c9\u7528<\/h2>\n<h3 id=\"1-%e5%8d%87%e5%ba%8f%e6%8e%92%e5%ba%8f-xaZULxncRr\">1. \u5347\u5e8f\u6392\u5e8f<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8868\uff0c\u5305\u542b\u54e1\u5de5\u7684\u59d3\u540d\u548c\u85aa\u6c34\u3002\u82e5\u8981\u6309\u85aa\u6c34\u5347\u5e8f\u6392\u5217\u6240\u6709\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT name, salary\nFROM employees\nORDER BY salary ASC;<\/code><\/pre>\n<h3 id=\"2-%e9%99%8d%e5%ba%8f%e6%8e%92%e5%ba%8f-xaZULxncRr\">2. \u964d\u5e8f\u6392\u5e8f<\/h3>\n<p>\u5982\u679c\u6211\u5011\u5e0c\u671b\u6309\u85aa\u6c34\u964d\u5e8f\u6392\u5217\uff0c\u53ef\u4ee5\u5c07 <code>ASC<\/code> \u6539\u70ba <code>DESC<\/code>\uff1a<\/p>\n<pre><code>SELECT name, salary\nFROM employees\nORDER BY salary DESC;<\/code><\/pre>\n<h3 id=\"3-%e5%a4%9a%e5%88%97%e6%8e%92%e5%ba%8f-xaZULxncRr\">3. \u591a\u5217\u6392\u5e8f<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u6839\u64da\u591a\u500b\u5217\u9032\u884c\u6392\u5e8f\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u5148\u6309\u90e8\u9580\u6392\u5e8f\uff0c\u518d\u6309\u85aa\u6c34\u6392\u5e8f\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT name, department, salary\nFROM employees\nORDER BY department ASC, salary DESC;<\/code><\/pre>\n<h2 id=\"%e6%8e%92%e5%ba%8f%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-xaZULxncRr\">\u6392\u5e8f\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528\u6392\u5e8f\u8a9e\u53e5\u6642\uff0c\u6709\u5e7e\u500b\u6ce8\u610f\u4e8b\u9805\u9700\u8981\u8003\u616e\uff1a<\/p>\n<ul>\n<li><strong>\u6027\u80fd\u554f\u984c\uff1a<\/strong>\u5c0d\u65bc\u5927\u578b\u6578\u64da\u96c6\uff0c\u6392\u5e8f\u64cd\u4f5c\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\u3002\u5efa\u8b70\u5728\u5fc5\u8981\u6642\u4f7f\u7528\u7d22\u5f15\u4f86\u63d0\u9ad8\u6548\u7387\u3002<\/li>\n<li><strong>NULL \u503c\u7684\u8655\u7406\uff1a<\/strong>\u5728\u6392\u5e8f\u6642\uff0cNULL \u503c\u7684\u8655\u7406\u65b9\u5f0f\u53ef\u80fd\u6703\u56e0\u6578\u64da\u5eab\u7cfb\u7d71\u800c\u7570\u3002\u901a\u5e38\uff0cNULL \u503c\u6703\u88ab\u6392\u5728\u6700\u524d\u9762\u6216\u6700\u5f8c\u9762\uff0c\u5177\u9ad4\u53d6\u6c7a\u65bc\u6392\u5e8f\u65b9\u5f0f\u3002<\/li>\n<li><strong>\u5b57\u7b26\u6392\u5e8f\uff1a<\/strong>\u5b57\u7b26\u578b\u6578\u64da\u7684\u6392\u5e8f\u662f\u57fa\u65bc\u5b57\u6bcd\u9806\u5e8f\u7684\uff0c\u9019\u53ef\u80fd\u6703\u53d7\u5230\u5b57\u7b26\u96c6\u7684\u5f71\u97ff\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%af%a6%e6%88%b0%e6%a1%88%e4%be%8b-xaZULxncRr\">\u5be6\u6230\u6848\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b <code>products<\/code> \u8868\uff0c\u5305\u542b\u7522\u54c1\u540d\u7a31\u3001\u985e\u5225\u548c\u50f9\u683c\u3002\u6211\u5011\u5e0c\u671b\u67e5\u8a62\u6240\u6709\u7522\u54c1\uff0c\u4e26\u6309\u985e\u5225\u5347\u5e8f\u548c\u50f9\u683c\u964d\u5e8f\u6392\u5217\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT product_name, category, price\nFROM products\nORDER BY category ASC, price DESC;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u4f7f\u6211\u5011\u80fd\u5920\u5feb\u901f\u627e\u5230\u6bcf\u500b\u985e\u5225\u4e2d\u50f9\u683c\u6700\u9ad8\u7684\u7522\u54c1\uff0c\u5f9e\u800c\u66f4\u597d\u5730\u9032\u884c\u5e02\u5834\u5206\u6790\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-xaZULxncRr\">\u7e3d\u7d50<\/h2>\n<p>SQL \u7684\u6392\u5e8f\u8a9e\u53e5\u662f\u6578\u64da\u67e5\u8a62\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u66f4\u6709\u6548\u5730\u7d44\u7e54\u548c\u5206\u6790\u6578\u64da\u3002\u7121\u8ad6\u662f\u5347\u5e8f\u9084\u662f\u964d\u5e8f\u6392\u5e8f\uff0c\u6216\u662f\u591a\u5217\u6392\u5e8f\uff0c\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u8a9e\u6cd5\u548c\u61c9\u7528\u6280\u5de7\u5c07\u5927\u5927\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u6d41\u66a2\u6027\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u4e86\u89e3 SQL \u6392\u5e8f\u8a9e\u53e5\uff0c\u638c\u63e1\u6578\u64da\u5eab\u4e2d\u6392\u5e8f\u4ee3\u78bc\u7684\u5be6\u7528\u6280\u5de7\u8207\u5be6\u6230\u6307\u5357\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\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-143867","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143867","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=143867"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143867\/revisions"}],"predecessor-version":[{"id":143868,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143867\/revisions\/143868"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143867"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143867"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143867"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}