{"id":168373,"date":"2024-11-06T11:50:17","date_gmt":"2024-11-06T03:50:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168373\/"},"modified":"2024-11-06T11:50:18","modified_gmt":"2024-11-06T03:50:18","slug":"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%ad%97%e6%af%8d%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168373\/","title":{"rendered":"SQL \u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b (sql \u6578\u64da\u5eab\u4e2d\u5b57\u6bcd\u7684\u6578\u64da\u985e\u578b)"},"content":{"rendered":"<h1 id=\"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-JZbuqBkDEu\">SQL \u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b<\/h1>\n<p>\u5728\u73fe\u4ee3\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u5b57\u7b26\u6578\u64da\u985e\u578b\u662f\u7528\u4f86\u5b58\u5132\u6587\u672c\u6578\u64da\u7684\u91cd\u8981\u7d44\u6210\u90e8\u5206\u3002\u7121\u8ad6\u662f\u7528\u65bc\u5b58\u5132\u7528\u6236\u540d\u3001\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u9084\u662f\u5176\u4ed6\u985e\u578b\u7684\u6587\u672c\u4fe1\u606f\uff0c\u7406\u89e3\u9019\u4e9b\u6578\u64da\u985e\u578b\u7684\u7279\u6027\u548c\u4f7f\u7528\u5834\u666f\u5c0d\u65bc\u6578\u64da\u5eab\u8a2d\u8a08\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e SQL \u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\uff0c\u5305\u62ec\u5176\u5b9a\u7fa9\u3001\u7279\u6027\u53ca\u4f7f\u7528\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-JZbuqBkDEu\">\u5b57\u7b26\u6578\u64da\u985e\u578b\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5b57\u7b26\u6578\u64da\u985e\u578b\u4e3b\u8981\u7528\u65bc\u5b58\u5132\u5b57\u6bcd\u3001\u6578\u5b57\u548c\u7b26\u865f\u7b49\u6587\u672c\u6578\u64da\u3002\u6839\u64da\u4e0d\u540c\u7684\u9700\u6c42\uff0cSQL \u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u5b57\u7b26\u6578\u64da\u985e\u578b\uff0c\u4e3b\u8981\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>CHAR(n)<\/strong>: \u56fa\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\uff0cn \u8868\u793a\u5b57\u7b26\u7684\u6578\u91cf\u3002\u5982\u679c\u5b58\u5132\u7684\u5b57\u7b26\u4e32\u9577\u5ea6\u5c0f\u65bc n\uff0c\u5247\u6703\u81ea\u52d5\u586b\u5145\u7a7a\u683c\u4ee5\u9054\u5230\u56fa\u5b9a\u9577\u5ea6\u3002<\/li>\n<li><strong>VARCHAR(n)<\/strong>: \u53ef\u8b8a\u9577\u5ea6\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\uff0cn \u8868\u793a\u6700\u5927\u5b57\u7b26\u6578\u3002\u8207 CHAR \u4e0d\u540c\uff0cVARCHAR \u53ea\u6703\u4f7f\u7528\u5be6\u969b\u5b58\u5132\u7684\u5b57\u7b26\u6578\u91cf\uff0c\u9019\u6a23\u53ef\u4ee5\u7bc0\u7701\u7a7a\u9593\u3002<\/li>\n<li><strong>TEXT<\/strong>: \u7528\u65bc\u5b58\u5132\u9577\u6587\u672c\u6578\u64da\uff0c\u6c92\u6709\u56fa\u5b9a\u7684\u9577\u5ea6\u9650\u5236\uff0c\u9069\u5408\u5b58\u5132\u5927\u91cf\u7684\u6587\u672c\u4fe1\u606f\u3002<\/li>\n<li><strong>NCHAR(n)<\/strong>: \u8207 CHAR \u985e\u4f3c\uff0c\u4f46\u7528\u65bc\u5b58\u5132 Unicode \u5b57\u7b26\uff0c\u9069\u5408\u591a\u8a9e\u8a00\u652f\u6301\u3002<\/li>\n<li><strong>NVARCHAR(n)<\/strong>: \u8207 VARCHAR \u985e\u4f3c\uff0c\u4f46\u7528\u65bc\u5b58\u5132 Unicode \u5b57\u7b26\uff0c\u652f\u6301\u591a\u8a9e\u8a00\u6587\u672c\u3002<\/li>\n<li><strong>NTEXT<\/strong>: \u8207 TEXT \u985e\u4f3c\uff0c\u4f46\u7528\u65bc\u5b58\u5132 Unicode \u5b57\u7b26\u7684\u9577\u6587\u672c\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e7%9a%84%e7%89%b9%e6%80%a7-JZbuqBkDEu\">\u5b57\u7b26\u6578\u64da\u985e\u578b\u7684\u7279\u6027<\/h2>\n<p>\u4e0d\u540c\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\u5177\u6709\u4e0d\u540c\u7684\u7279\u6027\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u5c0d\u65bc\u6578\u64da\u5eab\u6027\u80fd\u548c\u5b58\u5132\u6548\u7387\u81f3\u95dc\u91cd\u8981\uff1a<\/p>\n<h3 id=\"1-%e5%ad%98%e5%84%b2%e6%95%88%e7%8e%87-JZbuqBkDEu\">1. \u5b58\u5132\u6548\u7387<\/h3>\n<p>CHAR \u985e\u578b\u5728\u5b58\u5132\u56fa\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\u6642\u6548\u7387\u8f03\u9ad8\uff0c\u4f46\u5982\u679c\u5b58\u5132\u7684\u5b57\u7b26\u4e32\u9577\u5ea6\u8b8a\u5316\u8f03\u5927\uff0c\u5247\u53ef\u80fd\u6d6a\u8cbb\u7a7a\u9593\u3002\u76f8\u5c0d\u800c\u8a00\uff0cVARCHAR \u985e\u578b\u5728\u5b58\u5132\u53ef\u8b8a\u9577\u5ea6\u5b57\u7b26\u4e32\u6642\u66f4\u5177\u512a\u52e2\uff0c\u56e0\u70ba\u5b83\u53ea\u4f54\u7528\u5be6\u969b\u4f7f\u7528\u7684\u7a7a\u9593\u3002<\/p>\n<h3 id=\"2-%e6%80%a7%e8%83%bd-JZbuqBkDEu\">2. \u6027\u80fd<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0cCHAR \u985e\u578b\u7684\u6027\u80fd\u53ef\u80fd\u512a\u65bc VARCHAR\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u983b\u7e41\u9032\u884c\u5b57\u7b26\u4e32\u6bd4\u8f03\u7684\u60c5\u6cc1\u4e0b\u3002\u9019\u662f\u56e0\u70ba CHAR \u985e\u578b\u7684\u9577\u5ea6\u662f\u56fa\u5b9a\u7684\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u66f4\u5feb\u5730\u9032\u884c\u6bd4\u8f03\u64cd\u4f5c\u3002<\/p>\n<h3 id=\"3-%e5%a4%9a%e8%aa%9e%e8%a8%80%e6%94%af%e6%8c%81-JZbuqBkDEu\">3. \u591a\u8a9e\u8a00\u652f\u6301<\/h3>\n<p>\u5c0d\u65bc\u9700\u8981\u652f\u6301\u591a\u7a2e\u8a9e\u8a00\u7684\u61c9\u7528\uff0c\u4f7f\u7528 NCHAR\u3001NVARCHAR \u548c NTEXT \u985e\u578b\u662f\u5fc5\u8981\u7684\uff0c\u56e0\u70ba\u9019\u4e9b\u985e\u578b\u80fd\u5920\u6b63\u78ba\u5b58\u5132\u548c\u8655\u7406 Unicode \u5b57\u7b26\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%a4%ba%e4%be%8b-JZbuqBkDEu\">\u4f7f\u7528\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b SQL \u8a9e\u53e5\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528\u4e0d\u540c\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\uff1a<\/p>\n<pre><code>-- \u5275\u5efa\u4e00\u500b\u5305\u542b\u4e0d\u540c\u5b57\u7b26\u6578\u64da\u985e\u578b\u7684\u8868\nCREATE TABLE Users (\n    UserID INT PRIMARY KEY,\n    UserName VARCHAR(50),\n    Email VARCHAR(100),\n    Bio TEXT,\n    Country NCHAR(20)\n);\n\n-- \u63d2\u5165\u6578\u64da\nINSERT INTO Users (UserID, UserName, Email, Bio, Country) VALUES\n(1, 'Alice', 'alice@example.com', 'A software developer.', '\u9999\u6e2f'),\n(2, 'Bob', 'bob@example.com', 'A data analyst.', '\u53f0\u7063');\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-JZbuqBkDEu\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL \u6578\u64da\u5eab\u4e2d\uff0c\u5b57\u7b26\u6578\u64da\u985e\u578b\u662f\u5b58\u5132\u6587\u672c\u4fe1\u606f\u7684\u57fa\u790e\u3002\u9078\u64c7\u5408\u9069\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u9084\u80fd\u6709\u6548\u5730\u7ba1\u7406\u5b58\u5132\u7a7a\u9593\u3002\u4e86\u89e3\u5404\u7a2e\u5b57\u7b26\u6578\u64da\u985e\u578b\u7684\u7279\u6027\u548c\u4f7f\u7528\u5834\u666f\uff0c\u5c0d\u65bc\u8a2d\u8a08\u9ad8\u6548\u7684\u6578\u64da\u5eab\u7d50\u69cb\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3 SQL \u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\uff0c\u5305\u62ec CHAR\u3001VARCHAR \u548c TEXT\uff0c\u53ca\u5176\u5728\u6578\u64da\u5b58\u5132\u4e2d\u7684\u61c9\u7528\u8207\u7279\u9ede\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-168373","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168373","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=168373"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168373\/revisions"}],"predecessor-version":[{"id":168374,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168373\/revisions\/168374"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168373"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168373"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168373"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}