{"id":162749,"date":"2024-11-04T17:41:18","date_gmt":"2024-11-04T09:41:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162749\/"},"modified":"2024-11-04T17:41:19","modified_gmt":"2024-11-04T09:41:19","slug":"%e8%ac%9b%e8%a7%a3ibm-db2%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e5%b8%b8%e7%94%a8%e6%97%a5%e6%9c%9f%e6%93%8d%e4%bd%9c%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162749\/","title":{"rendered":"\u8b1b\u89e3IBM DB2\u6578\u64da\u5eab\u7684\u5e38\u7528\u65e5\u671f\u64cd\u4f5c\u51fd\u6578"},"content":{"rendered":"<h1 id=\"%e8%ac%9b%e8%a7%a3ibm-db2%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e5%b8%b8%e7%94%a8%e6%97%a5%e6%9c%9f%e6%93%8d%e4%bd%9c%e5%87%bd%e6%95%b8-uoywcxqFhl\">\u8b1b\u89e3IBM DB2\u6578\u64da\u5eab\u7684\u5e38\u7528\u65e5\u671f\u64cd\u4f5c\u51fd\u6578<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u65e5\u671f\u548c\u6642\u9593\u7684\u64cd\u4f5c\u662f\u975e\u5e38\u91cd\u8981\u7684\u4e00\u74b0\u3002IBM DB2\u4f5c\u70ba\u4e00\u6b3e\u5f37\u5927\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65e5\u671f\u64cd\u4f5c\u51fd\u6578\uff0c\u5e6b\u52a9\u7528\u6236\u9032\u884c\u65e5\u671f\u7684\u8a08\u7b97\u3001\u683c\u5f0f\u5316\u548c\u6bd4\u8f03\u7b49\u64cd\u4f5c\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u5e38\u7528\u7684\u65e5\u671f\u64cd\u4f5c\u51fd\u6578\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\uff0c\u4ee5\u4fbf\u8b80\u8005\u80fd\u5920\u66f4\u597d\u5730\u7406\u89e3\u548c\u61c9\u7528\u9019\u4e9b\u51fd\u6578\u3002<\/p>\n<h2 id=\"1-%e7%95%b6%e5%89%8d%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8-uoywcxqFhl\">1. \u7576\u524d\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u7372\u53d6\u7576\u524d\u65e5\u671f\u548c\u6642\u9593\u7684\u51fd\u6578\u4e3b\u8981\u6709\u4ee5\u4e0b\u5e7e\u500b\uff1a<\/p>\n<ul>\n<li><code>CURRENT DATE<\/code>\uff1a\u8fd4\u56de\u7576\u524d\u7684\u65e5\u671f\u3002<\/li>\n<li><code>CURRENT TIME<\/code>\uff1a\u8fd4\u56de\u7576\u524d\u7684\u6642\u9593\u3002<\/li>\n<li><code>CURRENT TIMESTAMP<\/code>\uff1a\u8fd4\u56de\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u53ef\u4ee5\u7372\u53d6\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\uff1a<\/p>\n<pre><code>SELECT CURRENT DATE AS \"\u4eca\u5929\u7684\u65e5\u671f\", CURRENT TIME AS \"\u73fe\u5728\u7684\u6642\u9593\", CURRENT TIMESTAMP AS \"\u7576\u524d\u6642\u9593\u6233\";<\/code><\/pre>\n<h2 id=\"2-%e6%97%a5%e6%9c%9f%e5%8a%a0%e6%b8%9b%e6%93%8d%e4%bd%9c-uoywcxqFhl\">2. \u65e5\u671f\u52a0\u6e1b\u64cd\u4f5c<\/h2>\n<p>DB2\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u9032\u884c\u65e5\u671f\u7684\u52a0\u6e1b\u64cd\u4f5c\u3002\u6700\u5e38\u7528\u7684\u51fd\u6578\u662f<code>ADD<\/code>\u548c<code>SUBTRACT<\/code>\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5728\u7576\u524d\u65e5\u671f\u4e0a\u52a0\u4e0a10\u5929\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT CURRENT DATE + 10 DAYS AS \"10\u5929\u5f8c\u7684\u65e5\u671f\";<\/code><\/pre>\n<p>\u540c\u6a23\u5730\uff0c\u82e5\u8981\u5f9e\u7576\u524d\u65e5\u671f\u4e2d\u6e1b\u53bb5\u5929\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>SELECT CURRENT DATE - 5 DAYS AS \"5\u5929\u524d\u7684\u65e5\u671f\";<\/code><\/pre>\n<h2 id=\"3-%e6%97%a5%e6%9c%9f%e6%a0%bc%e5%bc%8f%e5%8c%96-uoywcxqFhl\">3. \u65e5\u671f\u683c\u5f0f\u5316<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u65e5\u671f\u7684\u683c\u5f0f\u5316\u53ef\u4ee5\u901a\u904e<code>VARCHAR_FORMAT<\/code>\u51fd\u6578\u4f86\u5be6\u73fe\u3002\u9019\u500b\u51fd\u6578\u5141\u8a31\u7528\u6236\u5c07\u65e5\u671f\u8f49\u63db\u70ba\u6307\u5b9a\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5c07\u7576\u524d\u65e5\u671f\u683c\u5f0f\u5316\u70ba\u201cYYYY-MM-DD\u201d\u683c\u5f0f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT VARCHAR_FORMAT(CURRENT DATE, 'YYYY-MM-DD') AS \"\u683c\u5f0f\u5316\u65e5\u671f\";<\/code><\/pre>\n<h2 id=\"4-%e6%97%a5%e6%9c%9f%e6%af%94%e8%bc%83-uoywcxqFhl\">4. \u65e5\u671f\u6bd4\u8f03<\/h2>\n<p>\u5728\u9032\u884c\u6578\u64da\u67e5\u8a62\u6642\uff0c\u65e5\u671f\u7684\u6bd4\u8f03\u4e5f\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002DB2\u652f\u6301\u4f7f\u7528\u6a19\u6e96\u7684\u6bd4\u8f03\u904b\u7b97\u7b26\uff08\u5982<code>=<\/code>, <code>&gt;<\/code>, <code>&lt;<\/code>\u7b49\uff09\u4f86\u6bd4\u8f03\u65e5\u671f\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u67e5\u8a62\u6240\u6709\u57282023\u5e741\u67081\u65e5\u4e4b\u5f8c\u7684\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>SELECT * FROM your_table WHERE your_date_column &gt; '2023-01-01';<\/code><\/pre>\n<h2 id=\"5-%e5%85%b6%e4%bb%96%e5%b8%b8%e7%94%a8%e6%97%a5%e6%9c%9f%e5%87%bd%e6%95%b8-uoywcxqFhl\">5. \u5176\u4ed6\u5e38\u7528\u65e5\u671f\u51fd\u6578<\/h2>\n<p>\u9664\u4e86\u4e0a\u8ff0\u51fd\u6578\u5916\uff0cDB2\u9084\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5176\u4ed6\u6709\u7528\u7684\u65e5\u671f\u51fd\u6578\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><code>DAY<\/code>\uff1a\u8fd4\u56de\u65e5\u671f\u4e2d\u7684\u65e5\u90e8\u5206\u3002<\/li>\n<li><code>MONTH<\/code>\uff1a\u8fd4\u56de\u65e5\u671f\u4e2d\u7684\u6708\u90e8\u5206\u3002<\/li>\n<li><code>YEAR<\/code>\uff1a\u8fd4\u56de\u65e5\u671f\u4e2d\u7684\u5e74\u90e8\u5206\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u7372\u53d6\u7576\u524d\u65e5\u671f\u7684\u5e74\u4efd\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>SELECT YEAR(CURRENT DATE) AS \"\u7576\u524d\u5e74\u4efd\";<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-uoywcxqFhl\">\u7e3d\u7d50<\/h2>\n<p>IBM DB2\u63d0\u4f9b\u4e86\u591a\u7a2e\u5f37\u5927\u7684\u65e5\u671f\u64cd\u4f5c\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5728\u6578\u64da\u5eab\u4e2d\u9032\u884c\u9748\u6d3b\u7684\u65e5\u671f\u8a08\u7b97\u548c\u683c\u5f0f\u5316\u3002\u7121\u8ad6\u662f\u7372\u53d6\u7576\u524d\u65e5\u671f\u3001\u9032\u884c\u65e5\u671f\u52a0\u6e1b\u3001\u683c\u5f0f\u5316\u65e5\u671f\u9084\u662f\u6bd4\u8f03\u65e5\u671f\uff0cDB2\u90fd\u80fd\u63d0\u4f9b\u76f8\u61c9\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u638c\u63e1\u9019\u4e9b\u51fd\u6578\u7684\u4f7f\u7528\uff0c\u5c07\u6709\u52a9\u65bc\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u6216\u662f\u9700\u8981\u7a69\u5b9a\u7684<a href=\"https:\/\/server.hk\">VPS<\/a>\u89e3\u6c7a\u65b9\u6848\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3IBM DB2\u6578\u64da\u5eab\u4e2d\u5e38\u7528\u7684\u65e5\u671f\u64cd\u4f5c\u51fd\u6578\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u7c21\u5316\u65e5\u671f\u8a08\u7b97\u8207\u683c\u5f0f\u8f49\u63db\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-162749","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162749","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=162749"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162749\/revisions"}],"predecessor-version":[{"id":162750,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162749\/revisions\/162750"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162749"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162749"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162749"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}