{"id":179536,"date":"2024-11-09T02:38:22","date_gmt":"2024-11-08T18:38:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179536\/"},"modified":"2024-11-09T02:38:23","modified_gmt":"2024-11-08T18:38:23","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%ae%a1%e7%90%86%e6%99%82%e9%96%93%e5%ad%97%e6%ae%b5-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%99%82%e9%96%93%e5%ad%97%e6%ae%b5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179536\/","title":{"rendered":"\u5982\u4f55\u5728 SQL \u6578\u64da\u5eab\u4e2d\u7ba1\u7406\u6642\u9593\u5b57\u6bb5 (sql \u6578\u64da\u5eab\u6642\u9593\u5b57\u6bb5)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%ae%a1%e7%90%86%e6%99%82%e9%96%93%e5%ad%97%e6%ae%b5-aCiykUScuZ\">\u5982\u4f55\u5728 SQL \u6578\u64da\u5eab\u4e2d\u7ba1\u7406\u6642\u9593\u5b57\u6bb5<\/h1>\n<p>\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6642\u9593\u5b57\u6bb5\u7684\u7ba1\u7406\u662f\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u7121\u8ad6\u662f\u8a18\u9304\u7528\u6236\u7684\u8a3b\u518a\u6642\u9593\u3001\u4ea4\u6613\u7684\u6642\u9593\u6233\uff0c\u9084\u662f\u4e8b\u4ef6\u7684\u767c\u751f\u6642\u9593\uff0c\u6b63\u78ba\u5730\u8655\u7406\u6642\u9593\u6578\u64da\u5c0d\u65bc\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u5b8c\u6574\u6027\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728 SQL \u6578\u64da\u5eab\u4e2d\u6709\u6548\u5730\u7ba1\u7406\u6642\u9593\u5b57\u6bb5\uff0c\u5305\u62ec\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\u3001\u6642\u9593\u7684\u683c\u5f0f\u5316\u3001\u67e5\u8a62\u7684\u512a\u5316\u4ee5\u53ca\u5e38\u898b\u7684\u64cd\u4f5c\u793a\u4f8b\u3002<\/p>\n<h2 id=\"1-sql-%e4%b8%ad%e7%9a%84%e6%99%82%e9%96%93%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-aCiykUScuZ\">1. SQL \u4e2d\u7684\u6642\u9593\u6578\u64da\u985e\u578b<\/h2>\n<p>\u5728 SQL \u6578\u64da\u5eab\u4e2d\uff0c\u6642\u9593\u5b57\u6bb5\u901a\u5e38\u4f7f\u7528\u4ee5\u4e0b\u6578\u64da\u985e\u578b\u4f86\u5b58\u5132\uff1a<\/p>\n<ul>\n<li><strong>DATETIME<\/strong>: \u7528\u65bc\u5b58\u5132\u65e5\u671f\u548c\u6642\u9593\uff0c\u7bc4\u570d\u5f9e 1753 \u5e74\u5230 9999 \u5e74\uff0c\u7cbe\u5ea6\u70ba 3.33 \u6beb\u79d2\u3002<\/li>\n<li><strong>DATE<\/strong>: \u53ea\u5b58\u5132\u65e5\u671f\uff0c\u7bc4\u570d\u5f9e 1000 \u5e74\u5230 9999 \u5e74\u3002<\/li>\n<li><strong>TIME<\/strong>: \u7528\u65bc\u5b58\u5132\u6642\u9593\uff0c\u7bc4\u570d\u5f9e &#8216;-838:59:59&#8217; \u5230 &#8216;838:59:59&#8217;\u3002<\/li>\n<li><strong>TIMESTAMP<\/strong>: \u5b58\u5132\u81ea 1970 \u5e74 1 \u6708 1 \u65e5\u4ee5\u4f86\u7684\u79d2\u6578\uff0c\u901a\u5e38\u7528\u65bc\u8a18\u9304\u4e8b\u4ef6\u7684\u6642\u9593\u6233\u3002<\/li>\n<li><strong>YEAR<\/strong>: \u7528\u65bc\u5b58\u5132\u5e74\u4efd\uff0c\u7bc4\u570d\u5f9e 1901 \u5230 2155\u3002<\/li>\n<\/ul>\n<p>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u53d6\u6c7a\u65bc\u5177\u9ad4\u7684\u61c9\u7528\u9700\u6c42\u3002\u4f8b\u5982\uff0c\u5982\u679c\u9700\u8981\u8a18\u9304\u7cbe\u78ba\u7684\u6642\u9593\u6233\uff0c\u5247\u61c9\u9078\u64c7 <code>TIMESTAMP<\/code> \u6216 <code>DATETIME<\/code>\u3002<\/p>\n<h2 id=\"2-%e6%99%82%e9%96%93%e5%ad%97%e6%ae%b5%e7%9a%84%e6%a0%bc%e5%bc%8f%e5%8c%96-aCiykUScuZ\">2. \u6642\u9593\u5b57\u6bb5\u7684\u683c\u5f0f\u5316<\/h2>\n<p>\u5728\u63d2\u5165\u6216\u67e5\u8a62\u6642\u9593\u5b57\u6bb5\u6642\uff0c\u6b63\u78ba\u7684\u683c\u5f0f\u5316\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002SQL \u4e2d\u7684\u6642\u9593\u683c\u5f0f\u901a\u5e38\u70ba &#8216;YYYY-MM-DD HH:MM:SS&#8217;\u3002\u4ee5\u4e0b\u662f\u63d2\u5165\u6578\u64da\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>INSERT INTO events (event_name, event_time) VALUES ('\u958b\u6703', '2023-10-01 10:00:00');<\/code><\/pre>\n<p>\u5728\u67e5\u8a62\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>DATE_FORMAT<\/code> \u51fd\u6578\u4f86\u683c\u5f0f\u5316\u6642\u9593\u5b57\u6bb5\uff1a<\/p>\n<pre><code>SELECT event_name, DATE_FORMAT(event_time, '%Y-%m-%d %H:%i:%s') AS formatted_time FROM events;<\/code><\/pre>\n<h2 id=\"3-%e6%9f%a5%e8%a9%a2%e6%99%82%e9%96%93%e5%ad%97%e6%ae%b5-aCiykUScuZ\">3. \u67e5\u8a62\u6642\u9593\u5b57\u6bb5<\/h2>\n<p>\u67e5\u8a62\u6642\u9593\u5b57\u6bb5\u6642\uff0c\u901a\u5e38\u9700\u8981\u4f7f\u7528\u5404\u7a2e\u689d\u4ef6\u4f86\u7be9\u9078\u6578\u64da\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u7279\u5b9a\u65e5\u671f\u7bc4\u570d\u5167\u7684\u4e8b\u4ef6\uff1a<\/p>\n<pre><code>SELECT * FROM events WHERE event_time BETWEEN '2023-10-01' AND '2023-10-31';<\/code><\/pre>\n<p>\u6b64\u5916\uff0c\u9084\u53ef\u4ee5\u4f7f\u7528 <code>NOW()<\/code> \u51fd\u6578\u4f86\u7372\u53d6\u7576\u524d\u6642\u9593\uff0c\u4e26\u9032\u884c\u6bd4\u8f03\uff1a<\/p>\n<pre><code>SELECT * FROM events WHERE event_time &gt; NOW();<\/code><\/pre>\n<h2 id=\"4-%e6%99%82%e9%96%93%e5%ad%97%e6%ae%b5%e7%9a%84%e6%93%8d%e4%bd%9c-aCiykUScuZ\">4. \u6642\u9593\u5b57\u6bb5\u7684\u64cd\u4f5c<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u5c0d\u6642\u9593\u5b57\u6bb5\u7684\u64cd\u4f5c\u5305\u62ec\u52a0\u6e1b\u6642\u9593\u3001\u63d0\u53d6\u65e5\u671f\u90e8\u5206\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u64cd\u4f5c\u793a\u4f8b\uff1a<\/p>\n<ul>\n<li><strong>\u52a0\u6e1b\u6642\u9593<\/strong>: \u4f7f\u7528 <code>DATE_ADD<\/code> \u548c <code>DATE_SUB<\/code> \u51fd\u6578\u4f86\u52a0\u6e1b\u6642\u9593\u3002<\/li>\n<pre><code>SELECT DATE_ADD(event_time, INTERVAL 1 DAY) AS next_day FROM events;<\/code><\/pre>\n<li><strong>\u63d0\u53d6\u65e5\u671f\u90e8\u5206<\/strong>: \u4f7f\u7528 <code>YEAR<\/code>\u3001<code>MONTH<\/code>\u3001<code>DAY<\/code> \u7b49\u51fd\u6578\u4f86\u63d0\u53d6\u65e5\u671f\u7684\u7279\u5b9a\u90e8\u5206\u3002<\/li>\n<pre><code>SELECT YEAR(event_time) AS event_year FROM events;<\/code><\/pre>\n<\/ul>\n<h2 id=\"5-%e5%b8%b8%e8%a6%8b%e5%95%8f%e9%a1%8c%e8%88%87%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-aCiykUScuZ\">5. \u5e38\u898b\u554f\u984c\u8207\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u7ba1\u7406 SQL \u6578\u64da\u5eab\u4e2d\u7684\u6642\u9593\u5b57\u6bb5\u6642\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u554f\u984c\u53ca\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li><strong>\u6642\u5340\u554f\u984c<\/strong>: \u78ba\u4fdd\u5728\u5b58\u5132\u548c\u67e5\u8a62\u6642\u9593\u6642\u8003\u616e\u6642\u5340\u7684\u5f71\u97ff\uff0c\u7279\u5225\u662f\u5728\u5168\u7403\u61c9\u7528\u4e2d\u3002<\/li>\n<li><strong>\u6578\u64da\u4e00\u81f4\u6027<\/strong>: \u5728\u591a\u500b\u8868\u4e2d\u4f7f\u7528\u76f8\u540c\u7684\u6642\u9593\u683c\u5f0f\uff0c\u4ee5\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<li><strong>\u6027\u80fd\u512a\u5316<\/strong>: \u5728\u6642\u9593\u5b57\u6bb5\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-aCiykUScuZ\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL \u6578\u64da\u5eab\u4e2d\u7ba1\u7406\u6642\u9593\u5b57\u6bb5\u662f\u4e00\u9805\u91cd\u8981\u7684\u6280\u80fd\uff0c\u6d89\u53ca\u5230\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\u3001\u683c\u5f0f\u5316\u3001\u67e5\u8a62\u548c\u64cd\u4f5c\u7b49\u591a\u500b\u65b9\u9762\u3002\u901a\u904e\u6b63\u78ba\u7684\u7ba1\u7406\uff0c\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u5b8c\u6574\u6027\uff0c\u5f9e\u800c\u652f\u6301\u61c9\u7528\u7a0b\u5e8f\u7684\u6b63\u5e38\u904b\u884c\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u6258\u7ba1\u60a8\u7684\u6578\u64da\u5eab\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728 SQL \u6578\u64da\u5eab\u4e2d\u6709\u6548\u7ba1\u7406\u6642\u9593\u5b57\u6bb5\uff0c\u5305\u62ec\u6578\u64da\u985e\u578b\u3001\u67e5\u8a62\u6280\u5de7\u548c\u6700\u4f73\u5be6\u8e10\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-179536","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179536","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=179536"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179536\/revisions"}],"predecessor-version":[{"id":179537,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179536\/revisions\/179537"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179536"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179536"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179536"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}