{"id":6088,"date":"2024-11-14T08:38:32","date_gmt":"2024-11-14T00:38:32","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6088\/"},"modified":"2024-11-14T08:38:32","modified_gmt":"2024-11-14T00:38:32","slug":"oracle%e5%a6%82%e4%bd%95%e8%8e%b7%e5%8f%96%e6%97%b6%e9%97%b4","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6088\/","title":{"rendered":"oracle\u5982\u4f55\u83b7\u53d6\u65f6\u95f4"},"content":{"rendered":"<blockquote><p>\n  \u5728 oracle \u4e2d\u83b7\u53d6\u65f6\u95f4\u6709\u4ee5\u4e0b\u65b9\u6cd5\uff1acurrent_timestamp\uff1a\u8fd4\u56de\u5f53\u524d\u7cfb\u7edf\u65f6\u95f4\uff0c\u7cbe\u786e\u5230\u79d2\u3002systimestamp\uff1a\u6bd4 current_timestamp \u66f4\u51c6\u786e\uff0c\u7cbe\u786e\u5230\u7eb3\u79d2\u3002sysdate\uff1a\u8fd4\u56de\u5f53\u524d\u7cfb\u7edf\u65e5\u671f\uff0c\u4e0d\u542b\u65f6\u95f4\u90e8\u5206\u3002to_char(sysdate, &#8216;yyyy-mm-dd hh24:mi:ss&#8217;): \u5c06\u5f53\u524d\u7cfb\u7edf\u65e5\u671f\u548c\u65f6\u95f4\u8f6c\u6362\u4e3a\u7279\u5b9a\u683c\u5f0f\u3002extract\uff1a\u4ece\u65f6\u95f4\u503c\u4e2d\u63d0\u53d6\u7279\u5b9a\u90e8\u5206\uff0c\u5982\u5e74\u4efd\u3001\u6708\u4efd\u6216\u5c0f\u65f6\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202406\/12\/2024061222212058455.jpg\" class=\"aligncenter\" title=\"oracle\u5982\u4f55\u83b7\u53d6\u65f6\u95f4\u63d2\u56fe\" alt=\"oracle\u5982\u4f55\u83b7\u53d6\u65f6\u95f4\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u4f7f\u7528 Oracle \u83b7\u53d6\u65f6\u95f4<\/strong><\/p>\n<p>\u5728 Oracle \u4e2d\u83b7\u53d6\u65f6\u95f4\u6709\u51e0\u4e2a\u65b9\u6cd5\uff0c\u4ee5\u4e0b\u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5\uff1a<\/p>\n<p><strong>1. CURRENT_TIMESTAMP<\/strong><\/p>\n<p>CURRENT_TIMESTAMP \u51fd\u6570\u8fd4\u56de\u5f53\u524d\u7cfb\u7edf\u65f6\u95f4\uff0c\u7cbe\u786e\u5230\u79d2\u3002\u5b83\u901a\u5e38\u7528\u4e8e\u63d2\u5165\u8bb0\u5f55\u5230\u6570\u636e\u5e93\u4e2d\uff0c\u4ee5\u8bb0\u5f55\u521b\u5efa\u6216\u66f4\u65b0\u7684\u65f6\u95f4\u3002<\/p>\n<p>\u793a\u4f8b\uff1a<\/p>\n<pre>SELECT CURRENT_TIMESTAMP FROM DUAL;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. SYSTIMESTAMP<\/strong><\/p>\n<p>SYSTIMESTAMP \u51fd\u6570\u4e5f\u8fd4\u56de\u5f53\u524d\u7cfb\u7edf\u65f6\u95f4\uff0c\u4f46\u5b83\u6bd4 CURRENT_TIMESTAMP \u66f4\u51c6\u786e\uff0c\u7cbe\u786e\u5230\u7eb3\u79d2\u3002<\/p>\n<p>\u793a\u4f8b\uff1a<\/p>\n<pre>SELECT SYSTIMESTAMP FROM DUAL;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>3. SYSDATE<\/strong><\/p>\n<p>SYSDATE \u51fd\u6570\u8fd4\u56de\u5f53\u524d\u7cfb\u7edf\u65e5\u671f\uff0c\u4e0d\u5305\u62ec\u65f6\u95f4\u90e8\u5206\u3002<\/p>\n<p>\u793a\u4f8b\uff1a<\/p>\n<pre>SELECT SYSDATE FROM DUAL;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>4. TO_CHAR(SYSDATE, &#8216;YYYY-MM-DD HH24:MI:SS&#8217;)<\/strong><\/p>\n<p>\u6b64\u67e5\u8be2\u5c06\u5f53\u524d\u7cfb\u7edf\u65e5\u671f\u548c\u65f6\u95f4\u8f6c\u6362\u4e3a\u7279\u5b9a\u7684\u683c\u5f0f\uff08YYYY-MM-DD HH24:MI:SS\uff09\u3002<\/p>\n<p>\u793a\u4f8b\uff1a<\/p>\n<pre>SELECT TO_CHAR(SYSDATE, 'YYYY-MM-DD HH24:MI:SS') FROM DUAL;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>5. EXTRACT<\/strong><\/p>\n<p>EXTRACT \u51fd\u6570\u53ef\u7528\u4e8e\u4ece\u65f6\u95f4\u503c\u4e2d\u63d0\u53d6\u7279\u5b9a\u90e8\u5206\uff0c\u4f8b\u5982\u5e74\u4efd\u3001\u6708\u4efd\u6216\u5c0f\u65f6\u3002<\/p>\n<p>\u793a\u4f8b\uff1a<\/p>\n<pre>SELECT EXTRACT(YEAR FROM SYSDATE) FROM DUAL;  -- \u83b7\u53d6\u5e74\u4efd\nSELECT EXTRACT(MONTH FROM SYSDATE) FROM DUAL; -- \u83b7\u53d6\u6708\u4efd\nSELECT EXTRACT(HOUR FROM SYSDATE) FROM DUAL; -- \u83b7\u53d6\u5c0f\u65f6<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u83b7\u53d6\u65f6\u95f4\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 oracle \u4e2d\u83b7\u53d6\u65f6\u95f4\u6709\u4ee5\u4e0b\u65b9\u6cd5\uff1acurrent_timestamp\uff1a\u8fd4\u56de\u5f53\u524d\u7cfb\u7edf\u65f6\u95f4\uff0c\u7cbe\u786e\u5230\u79d2\u3002systimestamp\uff1a\u6bd4 current_timestamp \u66f4\u51c6\u786e\uff0c\u7cbe\u786e\u5230\u7eb3\u79d2\u3002sysdate\uff1a\u8fd4\u56de\u5f53\u524d\u7cfb\u7edf\u65e5\u671f\uff0c\u4e0d\u542b\u65f6\u95f4\u90e8\u5206\u3002to_char(sysdate, &#8216;yyyy-mm-dd hh24:mi:ss&#8217;): \u5c06\u5f53\u524d\u7cfb\u7edf\u65e5\u671f\u548c\u65f6\u95f4\u8f6c\u6362\u4e3a\u7279\u5b9a\u683c\u5f0f\u3002extract\uff1a\u4ece\u65f6\u95f4\u503c\u4e2d\u63d0\u53d6\u7279\u5b9a\u90e8\u5206\uff0c\u5982\u5e74\u4efd\u3001\u6708\u4efd\u6216\u5c0f\u65f6\u3002 \u5982\u4f55\u4f7f\u7528 Oracle \u83b7\u53d6\u65f6\u95f4 \u5728 Oracle \u4e2d\u83b7\u53d6\u65f6\u95f4\u6709\u51e0\u4e2a\u65b9\u6cd5\uff0c\u4ee5\u4e0b\u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5\uff1a 1. CURRENT_TIMESTAMP CURRENT_TIMESTAMP \u51fd\u6570\u8fd4\u56de\u5f53\u524d\u7cfb\u7edf\u65f6\u95f4\uff0c\u7cbe\u786e\u5230\u79d2\u3002\u5b83\u901a\u5e38\u7528\u4e8e\u63d2\u5165\u8bb0\u5f55\u5230\u6570\u636e\u5e93\u4e2d\uff0c\u4ee5\u8bb0\u5f55\u521b\u5efa\u6216\u66f4\u65b0\u7684\u65f6\u95f4\u3002 \u793a\u4f8b\uff1a SELECT CURRENT_TIMESTAMP FROM DUAL; \u767b\u5f55\u540e\u590d\u5236 2. SYSTIMESTAMP SYSTIMESTAMP \u51fd\u6570\u4e5f\u8fd4\u56de\u5f53\u524d\u7cfb\u7edf\u65f6\u95f4\uff0c\u4f46\u5b83\u6bd4 CURRENT_TIMESTAMP \u66f4\u51c6\u786e\uff0c\u7cbe\u786e\u5230\u7eb3\u79d2\u3002 \u793a\u4f8b\uff1a SELECT SYSTIMESTAMP FROM DUAL; \u767b\u5f55\u540e\u590d\u5236 3. SYSDATE SYSDATE \u51fd\u6570\u8fd4\u56de\u5f53\u524d\u7cfb\u7edf\u65e5\u671f\uff0c\u4e0d\u5305\u62ec\u65f6\u95f4\u90e8\u5206\u3002 \u793a\u4f8b\uff1a SELECT SYSDATE FROM DUAL; \u767b\u5f55\u540e\u590d\u5236 4. TO_CHAR(SYSDATE, &#8216;YYYY-MM-DD HH24:MI:SS&#8217;) \u6b64\u67e5\u8be2\u5c06\u5f53\u524d\u7cfb\u7edf\u65e5\u671f\u548c\u65f6\u95f4\u8f6c\u6362\u4e3a\u7279\u5b9a\u7684\u683c\u5f0f\uff08YYYY-MM-DD HH24:MI:SS\uff09\u3002 \u793a\u4f8b\uff1a SELECT TO_CHAR(SYSDATE, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-6088","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6088","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=6088"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6088\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6088"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6088"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}