{"id":139620,"date":"2024-10-31T19:05:21","date_gmt":"2024-10-31T11:05:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/139620\/"},"modified":"2024-10-31T19:05:21","modified_gmt":"2024-10-31T11:05:21","slug":"sql-server%e6%95%b8%e6%93%9a%e5%ba%ab%e6%98%93%e6%b7%b7%e6%b7%86%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/139620\/","title":{"rendered":"SQL Server\u6578\u64da\u5eab\u6613\u6df7\u6dc6\u7684\u6578\u64da\u985e\u578b\u793a\u4f8b"},"content":{"rendered":"<h1 id=\"sql-server%e6%95%b8%e6%93%9a%e5%ba%ab%e6%98%93%e6%b7%b7%e6%b7%86%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e7%a4%ba%e4%be%8b-IRBGkIaRyx\">SQL Server\u6578\u64da\u5eab\u6613\u6df7\u6dc6\u7684\u6578\u64da\u985e\u578b\u793a\u4f8b<\/h1>\n<p>\u5728\u4f7f\u7528SQL Server\u9032\u884c\u6578\u64da\u5eab\u8a2d\u8a08\u548c\u958b\u767c\u6642\uff0c\u9078\u64c7\u6b63\u78ba\u7684\u6578\u64da\u985e\u578b\u81f3\u95dc\u91cd\u8981\u3002\u4e0d\u540c\u7684\u6578\u64da\u985e\u578b\u4e0d\u50c5\u5f71\u97ff\u6578\u64da\u7684\u5b58\u5132\u65b9\u5f0f\uff0c\u9084\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\u548c\u6578\u64da\u5b8c\u6574\u6027\u3002\u7136\u800c\uff0cSQL Server\u4e2d\u6709\u8a31\u591a\u6578\u64da\u985e\u578b\u53ef\u80fd\u6703\u8b93\u958b\u767c\u8005\u611f\u5230\u56f0\u60d1\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u5e38\u898b\u7684\u6613\u6df7\u6dc6\u6578\u64da\u985e\u578b\uff0c\u4e26\u63d0\u4f9b\u793a\u4f8b\u4ee5\u5e6b\u52a9\u7406\u89e3\u5b83\u5011\u7684\u5340\u5225\u3002<\/p>\n<h2 id=\"1-%e6%95%b4%e6%95%b8%e9%a1%9e%e5%9e%8b%ef%bc%9aint-vs-bigint-IRBGkIaRyx\">1. \u6574\u6578\u985e\u578b\uff1aINT vs. BIGINT<\/h2>\n<p>\u6574\u6578\u985e\u578b\u662fSQL Server\u4e2d\u6700\u5e38\u7528\u7684\u6578\u64da\u985e\u578b\u4e4b\u4e00\u3002<code>INT<\/code>\u548c<code>BIGINT<\/code>\u90fd\u662f\u7528\u4f86\u5b58\u5132\u6574\u6578\u7684\uff0c\u4f46\u5b83\u5011\u7684\u7bc4\u570d\u548c\u5b58\u5132\u5927\u5c0f\u4e0d\u540c\u3002<\/p>\n<ul>\n<li><code>INT<\/code>\uff1a\u4f54\u75284\u500b\u5b57\u7bc0\uff0c\u7bc4\u570d\u5f9e-2,147,483,648\u52302,147,483,647\u3002<\/li>\n<li><code>BIGINT<\/code>\uff1a\u4f54\u75288\u500b\u5b57\u7bc0\uff0c\u7bc4\u570d\u5f9e-9,223,372,036,854,775,808\u52309,223,372,036,854,775,807\u3002<\/li>\n<\/ul>\n<p>\u5728\u9078\u64c7\u9019\u5169\u8005\u6642\uff0c\u61c9\u6839\u64da\u9810\u671f\u7684\u6578\u64da\u7bc4\u570d\u4f86\u6c7a\u5b9a\u3002\u5982\u679c\u6578\u64da\u4e0d\u6703\u8d85\u904e<code>INT<\/code>\u7684\u7bc4\u570d\uff0c\u5247\u4f7f\u7528<code>INT<\/code>\u53ef\u4ee5\u7bc0\u7701\u5b58\u5132\u7a7a\u9593\u3002<\/p>\n<h2 id=\"2-%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%a1%9e%e5%9e%8b%ef%bc%9achar-vs-varchar-IRBGkIaRyx\">2. \u5b57\u7b26\u4e32\u985e\u578b\uff1aCHAR vs. VARCHAR<\/h2>\n<p>\u5728\u8655\u7406\u5b57\u7b26\u4e32\u6578\u64da\u6642\uff0c<code>CHAR<\/code>\u548c<code>VARCHAR<\/code>\u662f\u5169\u500b\u5e38\u898b\u7684\u9078\u64c7\u3002\u5b83\u5011\u7684\u4e3b\u8981\u5340\u5225\u5728\u65bc\u5b58\u5132\u65b9\u5f0f\u548c\u9577\u5ea6\u3002<\/p>\n<ul>\n<li><code>CHAR(n)<\/code>\uff1a\u56fa\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\uff0c\u7121\u8ad6\u5be6\u969b\u5b58\u5132\u7684\u5b57\u7b26\u6578\u91cf\u5982\u4f55\uff0c\u59cb\u7d42\u4f54\u7528n\u500b\u5b57\u7bc0\u3002\u5982\u679c\u5b58\u5132\u7684\u5b57\u7b26\u4e32\u5c11\u65bcn\uff0c\u5247\u6703\u7528\u7a7a\u683c\u586b\u5145\u3002<\/li>\n<li><code>VARCHAR(n)<\/code>\uff1a\u53ef\u8b8a\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\uff0c\u50c5\u6839\u64da\u5be6\u969b\u5b58\u5132\u7684\u5b57\u7b26\u6578\u91cf\u4f54\u7528\u7a7a\u9593\uff0c\u6700\u591a\u53ef\u9054n\u500b\u5b57\u7bc0\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u77e5\u9053\u67d0\u500b\u5b57\u6bb5\u59cb\u7d42\u6703\u5b58\u513210\u500b\u5b57\u7b26\uff0c\u5247\u4f7f\u7528<code>CHAR(10)<\/code>\u6703\u66f4\u5408\u9069\uff1b\u5982\u679c\u5b57\u7b26\u4e32\u9577\u5ea6\u4e0d\u56fa\u5b9a\uff0c\u5247\u61c9\u9078\u64c7<code>VARCHAR<\/code>\u3002<\/p>\n<h2 id=\"3-%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e9%a1%9e%e5%9e%8b%ef%bc%9adatetime-vs-datetime2-IRBGkIaRyx\">3. \u65e5\u671f\u548c\u6642\u9593\u985e\u578b\uff1aDATETIME vs. DATETIME2<\/h2>\n<p>\u5728\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\u6642\uff0c<code>DATETIME<\/code>\u548c<code>DATETIME2<\/code>\u662f\u5169\u500b\u5e38\u7528\u7684\u6578\u64da\u985e\u578b\u3002\u5b83\u5011\u7684\u4e3b\u8981\u5340\u5225\u5728\u65bc\u7cbe\u5ea6\u548c\u7bc4\u570d\u3002<\/p>\n<ul>\n<li><code>DATETIME<\/code>\uff1a\u7bc4\u570d\u5f9e1753\u5e741\u67081\u65e5\u52309999\u5e7412\u670831\u65e5\uff0c\u7cbe\u5ea6\u70ba3.33\u6beb\u79d2\u3002<\/li>\n<li><code>DATETIME2<\/code>\uff1a\u7bc4\u570d\u5f9e0001\u5e741\u67081\u65e5\u52309999\u5e7412\u670831\u65e5\uff0c\u7cbe\u5ea6\u53ef\u9054\u5230100\u7d0d\u79d2\u3002<\/li>\n<\/ul>\n<p>\u5982\u679c\u9700\u8981\u66f4\u9ad8\u7684\u7cbe\u5ea6\u548c\u66f4\u5ee3\u6cdb\u7684\u65e5\u671f\u7bc4\u570d\uff0c\u5247\u61c9\u9078\u64c7<code>DATETIME2<\/code>\u3002<\/p>\n<h2 id=\"4-%e6%b5%ae%e9%bb%9e%e6%95%b8%e9%a1%9e%e5%9e%8b%ef%bc%9afloat-vs-real-IRBGkIaRyx\">4. \u6d6e\u9ede\u6578\u985e\u578b\uff1aFLOAT vs. REAL<\/h2>\n<p>\u5728\u8655\u7406\u6d6e\u9ede\u6578\u6642\uff0c<code>FLOAT<\/code>\u548c<code>REAL<\/code>\u662f\u5169\u500b\u9078\u64c7\u3002\u5b83\u5011\u7684\u4e3b\u8981\u5340\u5225\u5728\u65bc\u7cbe\u5ea6\u548c\u5b58\u5132\u5927\u5c0f\u3002<\/p>\n<ul>\n<li><code>REAL<\/code>\uff1a\u4f54\u75284\u500b\u5b57\u7bc0\uff0c\u7cbe\u5ea6\u7d04\u70ba7\u4f4d\u5341\u9032\u5236\u6578\u3002<\/li>\n<li><code>FLOAT(n)<\/code>\uff1a\u4f54\u75288\u500b\u5b57\u7bc0\uff0c\u7cbe\u5ea6\u53d6\u6c7a\u65bcn\u7684\u503c\uff0c\u901a\u5e38\u53ef\u9054\u523015\u4f4d\u5341\u9032\u5236\u6578\u3002<\/li>\n<\/ul>\n<p>\u5728\u9700\u8981\u9ad8\u7cbe\u5ea6\u8a08\u7b97\u7684\u60c5\u6cc1\u4e0b\uff0c\u5efa\u8b70\u4f7f\u7528<code>FLOAT<\/code>\uff0c\u800c\u5728\u5c0d\u7cbe\u5ea6\u8981\u6c42\u4e0d\u9ad8\u7684\u60c5\u6cc1\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528<code>REAL<\/code>\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-IRBGkIaRyx\">\u7e3d\u7d50<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u9078\u64c7\u6b63\u78ba\u7684\u6578\u64da\u985e\u578b\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u53ef\u7dad\u8b77\u6027\u81f3\u95dc\u91cd\u8981\u3002\u4e86\u89e3\u4e0d\u540c\u6578\u64da\u985e\u578b\u4e4b\u9593\u7684\u5340\u5225\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u505a\u51fa\u66f4\u660e\u667a\u7684\u9078\u64c7\u3002\u7121\u8ad6\u662f\u6574\u6578\u3001\u5b57\u7b26\u4e32\u3001\u65e5\u671f\u9084\u662f\u6d6e\u9ede\u6578\uff0c\u6b63\u78ba\u7684\u6578\u64da\u985e\u578b\u9078\u64c7\u90fd\u80fd\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6548\u7387\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u6258\u7ba1\u9084\u662f\u61c9\u7528\u7a0b\u5e8f\u90e8\u7f72\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22SQL Server\u4e2d\u6613\u6df7\u6dc6\u7684\u6578\u64da\u985e\u578b\u793a\u4f8b\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7406\u89e3\u548c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\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-139620","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139620","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=139620"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139620\/revisions"}],"predecessor-version":[{"id":139621,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139620\/revisions\/139621"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=139620"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=139620"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=139620"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}