{"id":166859,"date":"2024-11-05T20:13:20","date_gmt":"2024-11-05T12:13:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/166859\/"},"modified":"2024-11-05T20:13:22","modified_gmt":"2024-11-05T12:13:22","slug":"%e4%ba%86%e8%a7%a3%e6%95%b8%e6%93%9a%e5%ba%absql%e8%aa%9e%e8%a8%80%ef%bc%8c%e8%bc%95%e9%ac%86%e7%ae%a1%e7%90%86%e6%95%b8%e6%93%9a-%e6%95%b8%e6%93%9a%e5%ba%ab-sql%e8%aa%9e%e8%a8%80","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/166859\/","title":{"rendered":"\u4e86\u89e3\u6578\u64da\u5eabSQL\u8a9e\u8a00\uff0c\u8f15\u9b06\u7ba1\u7406\u6578\u64da (\u6578\u64da\u5eab sql\u8a9e\u8a00)"},"content":{"rendered":"<h1 id=\"%e4%ba%86%e8%a7%a3%e6%95%b8%e6%93%9a%e5%ba%absql%e8%aa%9e%e8%a8%80%ef%bc%8c%e8%bc%95%e9%ac%86%e7%ae%a1%e7%90%86%e6%95%b8%e6%93%9a-RhZxqLAXrS\">\u4e86\u89e3\u6578\u64da\u5eabSQL\u8a9e\u8a00\uff0c\u8f15\u9b06\u7ba1\u7406\u6578\u64da<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\u3002SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u8207\u6578\u64da\u5eab\u4ea4\u4e92\u7684\u4e3b\u8981\u8a9e\u8a00\uff0c\u7121\u8ad6\u662f\u7528\u65bc\u6578\u64da\u7684\u67e5\u8a62\u3001\u66f4\u65b0\u9084\u662f\u7ba1\u7406\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eSQL\u8a9e\u8a00\u7684\u57fa\u672c\u6982\u5ff5\u53ca\u5176\u5728\u6578\u64da\u7ba1\u7406\u4e2d\u7684\u61c9\u7528\uff0c\u5e6b\u52a9\u8b80\u8005\u8f15\u9b06\u638c\u63e1\u6578\u64da\u5eab\u7684\u7ba1\u7406\u6280\u5de7\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afsql%ef%bc%9f-RhZxqLAXrS\">\u4ec0\u9ebc\u662fSQL\uff1f<\/h2>\n<p>SQL\uff0c\u5373\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff0c\u662f\u4e00\u7a2e\u5c08\u9580\u7528\u65bc\u7ba1\u7406\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u7de8\u7a0b\u8a9e\u8a00\u3002\u5b83\u7684\u4e3b\u8981\u529f\u80fd\u5305\u62ec\u6578\u64da\u67e5\u8a62\u3001\u6578\u64da\u63d2\u5165\u3001\u6578\u64da\u66f4\u65b0\u548c\u6578\u64da\u522a\u9664\u3002SQL\u7684\u8a9e\u6cd5\u7c21\u55ae\u6613\u61c2\uff0c\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u5feb\u901f\u4e0a\u624b\u4e26\u9032\u884c\u6578\u64da\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"sql%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-RhZxqLAXrS\">SQL\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>SQL\u8a9e\u8a00\u7684\u57fa\u672c\u8a9e\u6cd5\u5305\u62ec\u4ee5\u4e0b\u5e7e\u500b\u4e3b\u8981\u90e8\u5206\uff1a<\/p>\n<ul>\n<li><strong>\u67e5\u8a62\u6578\u64da\uff08SELECT\uff09<\/strong>: \u7528\u65bc\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u6578\u64da\u3002<\/li>\n<li><strong>\u63d2\u5165\u6578\u64da\uff08INSERT\uff09<\/strong>: \u7528\u65bc\u5411\u6578\u64da\u5eab\u4e2d\u6dfb\u52a0\u65b0\u6578\u64da\u3002<\/li>\n<li><strong>\u66f4\u65b0\u6578\u64da\uff08UPDATE\uff09<\/strong>: \u7528\u65bc\u4fee\u6539\u5df2\u5b58\u5728\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u522a\u9664\u6578\u64da\uff08DELETE\uff09<\/strong>: \u7528\u65bc\u5f9e\u6578\u64da\u5eab\u4e2d\u522a\u9664\u6578\u64da\u3002<\/li>\n<\/ul>\n<h3 id=\"%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e7%a4%ba%e4%be%8b-RhZxqLAXrS\">\u67e5\u8a62\u6578\u64da\u793a\u4f8b<\/h3>\n<pre><code>SELECT * FROM users WHERE age &gt; 18;<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8a62\u5c07\u5f9e\u540d\u70ba\u201cusers\u201d\u7684\u8868\u4e2d\u6aa2\u7d22\u6240\u6709\u5e74\u9f61\u5927\u65bc18\u6b72\u7684\u7528\u6236\u4fe1\u606f\u3002<\/p>\n<h3 id=\"%e6%8f%92%e5%85%a5%e6%95%b8%e6%93%9a%e7%a4%ba%e4%be%8b-RhZxqLAXrS\">\u63d2\u5165\u6578\u64da\u793a\u4f8b<\/h3>\n<pre><code>INSERT INTO users (name, age) VALUES ('\u5f35\u4e09', 25);<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u4e00\u500b\u540d\u70ba\u201c\u5f35\u4e09\u201d\u7684\u65b0\u7528\u6236\u63d2\u5165\u5230\u201cusers\u201d\u8868\u4e2d\uff0c\u5e74\u9f61\u70ba25\u3002<\/p>\n<h3 id=\"%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a%e7%a4%ba%e4%be%8b-RhZxqLAXrS\">\u66f4\u65b0\u6578\u64da\u793a\u4f8b<\/h3>\n<pre><code>UPDATE users SET age = 26 WHERE name = '\u5f35\u4e09';<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u201c\u5f35\u4e09\u201d\u7684\u5e74\u9f61\u66f4\u65b0\u70ba26\u3002<\/p>\n<h3 id=\"%e5%88%aa%e9%99%a4%e6%95%b8%e6%93%9a%e7%a4%ba%e4%be%8b-RhZxqLAXrS\">\u522a\u9664\u6578\u64da\u793a\u4f8b<\/h3>\n<pre><code>DELETE FROM users WHERE name = '\u5f35\u4e09';<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u522a\u9664\u540d\u70ba\u201c\u5f35\u4e09\u201d\u7684\u7528\u6236\u3002<\/p>\n<h2 id=\"sql%e7%9a%84%e9%80%b2%e9%9a%8e%e5%8a%9f%e8%83%bd-RhZxqLAXrS\">SQL\u7684\u9032\u968e\u529f\u80fd<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u7684\u6578\u64da\u64cd\u4f5c\uff0cSQL\u9084\u63d0\u4f9b\u4e86\u4e00\u4e9b\u9032\u968e\u529f\u80fd\uff0c\u5e6b\u52a9\u7528\u6236\u66f4\u9ad8\u6548\u5730\u7ba1\u7406\u6578\u64da\uff1a<\/p>\n<ul>\n<li><strong>\u806f\u63a5\uff08JOIN\uff09<\/strong>: \u7528\u65bc\u5c07\u591a\u500b\u8868\u4e2d\u7684\u6578\u64da\u9032\u884c\u95dc\u806f\u67e5\u8a62\u3002<\/li>\n<li><strong>\u805a\u5408\u51fd\u6578\uff08\u5982COUNT, SUM, AVG\uff09<\/strong>: \u7528\u65bc\u5c0d\u6578\u64da\u9032\u884c\u7d71\u8a08\u5206\u6790\u3002<\/li>\n<li><strong>\u5b50\u67e5\u8a62\uff08Subquery\uff09<\/strong>: \u5728\u4e00\u500b\u67e5\u8a62\u4e2d\u5d4c\u5957\u53e6\u4e00\u500b\u67e5\u8a62\uff0c\u4ee5\u7372\u53d6\u66f4\u8907\u96dc\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<h3 id=\"%e8%81%af%e6%8e%a5%e7%a4%ba%e4%be%8b-RhZxqLAXrS\">\u806f\u63a5\u793a\u4f8b<\/h3>\n<pre><code>SELECT users.name, orders.amount \nFROM users \nJOIN orders ON users.id = orders.user_id;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u7528\u6236\u53ca\u5176\u8a02\u55ae\u91d1\u984d\u7684\u5217\u8868\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-RhZxqLAXrS\">\u7d50\u8ad6<\/h2>\n<p>\u638c\u63e1SQL\u8a9e\u8a00\u662f\u6578\u64da\u5eab\u7ba1\u7406\u7684\u57fa\u790e\uff0c\u7121\u8ad6\u662f\u5c0d\u65bc\u521d\u5b78\u8005\u9084\u662f\u5c08\u696d\u4eba\u58eb\uff0c\u4e86\u89e3SQL\u7684\u57fa\u672c\u8a9e\u6cd5\u548c\u9032\u968e\u529f\u80fd\u90fd\u80fd\u5927\u5927\u63d0\u9ad8\u6578\u64da\u7ba1\u7406\u7684\u6548\u7387\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u5b78\u6703\u5982\u4f55\u4f7f\u7528SQL\u4f86\u6709\u6548\u5730\u7ba1\u7406\u548c\u5206\u6790\u6578\u64da\u5c07\u8b8a\u5f97\u8d8a\u4f86\u8d8a\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<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1\u6578\u64da\u5eabSQL\u8a9e\u8a00\uff0c\u8f15\u9b06\u7ba1\u7406\u548c\u67e5\u8a62\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u52a9\u4f60\u5728\u6578\u64da\u5206\u6790\u4e2d\u6e38\u5203\u6709\u9918\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-166859","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/166859","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=166859"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/166859\/revisions"}],"predecessor-version":[{"id":166860,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/166859\/revisions\/166860"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=166859"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=166859"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=166859"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}