{"id":168817,"date":"2024-11-06T16:28:20","date_gmt":"2024-11-06T08:28:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168817\/"},"modified":"2024-11-06T16:28:21","modified_gmt":"2024-11-06T08:28:21","slug":"t-sql-programming-1%ef%bc%9adatetime-datatype-part1","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168817\/","title":{"rendered":"T-SQL Programming 1\uff1aDateTime Datatype part1"},"content":{"rendered":"<h1 id=\"t-sql-%e7%a8%8b%e5%bc%8f%e8%a8%ad%e8%a8%88-1%ef%bc%9adatetime-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%ef%bc%88%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86%ef%bc%89-OktSiPJtPX\">T-SQL \u7a0b\u5f0f\u8a2d\u8a08 1\uff1aDateTime \u6578\u64da\u985e\u578b\uff08\u7b2c\u4e00\u90e8\u5206\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u65e5\u671f\u548c\u6642\u9593\u7684\u8655\u7406\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u5c24\u5176\u662f\u5728\u4f7f\u7528 Microsoft SQL Server \u7684 T-SQL \u8a9e\u8a00\u6642\u3002T-SQL \u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u64da\u985e\u578b\u4f86\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\uff0c\u5176\u4e2d\u6700\u5e38\u7528\u7684\u5c31\u662f <code>DateTime<\/code> \u6578\u64da\u985e\u578b\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e <code>DateTime<\/code> \u6578\u64da\u985e\u578b\u7684\u7279\u6027\u3001\u4f7f\u7528\u65b9\u6cd5\u4ee5\u53ca\u4e00\u4e9b\u5e38\u898b\u7684\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"datetime-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e6%a6%82%e8%bf%b0-OktSiPJtPX\">DateTime \u6578\u64da\u985e\u578b\u6982\u8ff0<\/h2>\n<p><code>DateTime<\/code> \u6578\u64da\u985e\u578b\u7528\u65bc\u5b58\u5132\u65e5\u671f\u548c\u6642\u9593\u7684\u503c\uff0c\u7bc4\u570d\u5f9e 1753 \u5e74 1 \u6708 1 \u65e5\u5230 9999 \u5e74 12 \u6708 31 \u65e5\uff0c\u7cbe\u5ea6\u70ba 3.33 \u6beb\u79d2\u3002\u9019\u4f7f\u5f97 <code>DateTime<\/code> \u975e\u5e38\u9069\u5408\u7528\u65bc\u9700\u8981\u7cbe\u78ba\u6642\u9593\u6233\u7684\u61c9\u7528\u5834\u666f\uff0c\u4f8b\u5982\u4ea4\u6613\u8a18\u9304\u3001\u65e5\u8a8c\u6587\u4ef6\u7b49\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%ae%9a%e7%be%a9-datetime-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-OktSiPJtPX\">\u5982\u4f55\u5b9a\u7fa9 DateTime \u6578\u64da\u985e\u578b<\/h2>\n<p>\u5728 T-SQL \u4e2d\uff0c\u60a8\u53ef\u4ee5\u5728\u5275\u5efa\u8868\u6642\u5b9a\u7fa9 <code>DateTime<\/code> \u6578\u64da\u985e\u578b\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE Orders (\n    OrderID INT PRIMARY KEY,\n    OrderDate DATETIME,\n    CustomerName NVARCHAR(100)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <code>Orders<\/code> \u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u500b <code>OrderDate<\/code> \u5217\uff0c\u8a72\u5217\u7684\u6578\u64da\u985e\u578b\u70ba <code>DateTime<\/code>\u3002<\/p>\n<h2 id=\"%e6%8f%92%e5%85%a5-datetime-%e5%80%bc-OktSiPJtPX\">\u63d2\u5165 DateTime \u503c<\/h2>\n<p>\u63d2\u5165 <code>DateTime<\/code> \u503c\u6642\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u591a\u7a2e\u683c\u5f0f\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u63d2\u5165\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>INSERT INTO Orders (OrderID, OrderDate, CustomerName)\nVALUES (1, '2023-10-01 14:30:00', 'John Doe');\n\nINSERT INTO Orders (OrderID, OrderDate, CustomerName)\nVALUES (2, GETDATE(), 'Jane Smith');<\/code><\/pre>\n<p>\u5728\u7b2c\u4e00\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u624b\u52d5\u6307\u5b9a\u4e86\u65e5\u671f\u548c\u6642\u9593\uff0c\u800c\u5728\u7b2c\u4e8c\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86 <code>GETDATE()<\/code> \u51fd\u6578\u4f86\u7372\u53d6\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002<\/p>\n<h2 id=\"datetime-%e7%9a%84%e5%b8%b8%e8%a6%8b%e6%93%8d%e4%bd%9c-OktSiPJtPX\">DateTime \u7684\u5e38\u898b\u64cd\u4f5c<\/h2>\n<p>\u5728 T-SQL \u4e2d\uff0c\u60a8\u53ef\u4ee5\u5c0d <code>DateTime<\/code> \u503c\u9032\u884c\u591a\u7a2e\u64cd\u4f5c\uff0c\u4f8b\u5982\u8a08\u7b97\u65e5\u671f\u5dee\u7570\u3001\u683c\u5f0f\u5316\u65e5\u671f\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u64cd\u4f5c\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"%e8%a8%88%e7%ae%97%e6%97%a5%e6%9c%9f%e5%b7%ae%e7%95%b0-OktSiPJtPX\">\u8a08\u7b97\u65e5\u671f\u5dee\u7570<\/h3>\n<p>\u4f7f\u7528 <code>DATEDIFF<\/code> \u51fd\u6578\u53ef\u4ee5\u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5dee\u7570\u3002\u4ee5\u4e0b\u662f\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT DATEDIFF(DAY, '2023-10-01', '2023-10-10') AS DateDifference;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5929\u6578\u5dee\u7570\u3002<\/p>\n<h3 id=\"%e6%a0%bc%e5%bc%8f%e5%8c%96%e6%97%a5%e6%9c%9f-OktSiPJtPX\">\u683c\u5f0f\u5316\u65e5\u671f<\/h3>\n<p>\u4f7f\u7528 <code>FORMAT<\/code> \u51fd\u6578\u53ef\u4ee5\u5c07 <code>DateTime<\/code> \u503c\u683c\u5f0f\u5316\u70ba\u7279\u5b9a\u7684\u5b57\u4e32\u683c\u5f0f\uff1a<\/p>\n<pre><code>SELECT FORMAT(OrderDate, 'yyyy-MM-dd HH:mm:ss') AS FormattedDate\nFROM Orders;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u683c\u5f0f\u5316\u5f8c\u7684\u65e5\u671f\u548c\u6642\u9593\u5b57\u4e32\u3002<\/p>\n<h2 id=\"%e5%b0%8f%e7%b5%90-OktSiPJtPX\">\u5c0f\u7d50<\/h2>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u4ecb\u7d39\u4e86 T-SQL \u4e2d\u7684 <code>DateTime<\/code> \u6578\u64da\u985e\u578b\uff0c\u5305\u62ec\u5176\u5b9a\u7fa9\u3001\u63d2\u5165\u65b9\u6cd5\u4ee5\u53ca\u5e38\u898b\u64cd\u4f5c\u3002\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u77e5\u8b58\u5c0d\u65bc\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u8cc7\u6599\u5eab\u4e2d\u7684\u65e5\u671f\u548c\u6642\u9593\u6578\u64da\u81f3\u95dc\u91cd\u8981\u3002\u5728\u63a5\u4e0b\u4f86\u7684\u90e8\u5206\u4e2d\uff0c\u6211\u5011\u5c07\u9032\u4e00\u6b65\u63a2\u8a0e <code>DateTime<\/code> \u7684\u5176\u4ed6\u76f8\u95dc\u529f\u80fd\u548c\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u548c\u5176\u4ed6\u4f3a\u670d\u5668\u89e3\u6c7a\u65b9\u6848\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn the fundamentals of T-SQL programming with a focus on the DateTime datatype in this comprehensive guide. Perfect for beginners!<\/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-168817","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168817","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=168817"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168817\/revisions"}],"predecessor-version":[{"id":168818,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168817\/revisions\/168818"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168817"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168817"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168817"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}