{"id":5305,"date":"2024-11-14T13:09:36","date_gmt":"2024-11-14T05:09:36","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5305\/"},"modified":"2024-11-14T13:09:36","modified_gmt":"2024-11-14T05:09:36","slug":"oracle%e6%80%8e%e4%b9%88%e8%8e%b7%e5%8f%96%e6%97%b6%e9%97%b4","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5305\/","title":{"rendered":"oracle\u600e\u4e48\u83b7\u53d6\u65f6\u95f4"},"content":{"rendered":"

\n \u5728 oracle \u4e2d\u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u53ef\u4ee5\u4f7f\u7528 sysdate \u6216 current_timestamp \u7cfb\u7edf\u53d8\u91cf\uff0c\u5b83\u4eec\u5206\u522b\u8fd4\u56de\u670d\u52a1\u5668\u5f53\u524d\u65f6\u95f4\u6233\u6216\u8003\u8651\u4f1a\u8bdd\u65f6\u533a\u7684\u65f6\u95f4\u6233\u3002\u6b64\u5916\uff0c\u53ef\u4ee5\u4f7f\u7528 extract \u51fd\u6570\u63d0\u53d6\u65f6\u95f4\u6233\u7684\u7279\u5b9a\u7ec4\u4ef6\uff0c\u5982\u5c0f\u65f6\u3001\u5206\u949f\u3001\u79d2\u3002\n<\/p><\/blockquote>\n

\"oracle\u600e\u4e48\u83b7\u53d6\u65f6\u95f4\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u5728 Oracle \u4e2d\u83b7\u53d6\u5f53\u524d\u65f6\u95f4<\/h2>\n

\u5728 Oracle \u6570\u636e\u5e93\u4e2d\uff0c\u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u53ef\u4ee5\u4f7f\u7528 SYSDATE \u7cfb\u7edf\u53d8\u91cf\u3002\u5b83\u8fd4\u56de\u670d\u52a1\u5668\u5f53\u524d\u65f6\u95f4\u6233\u3002<\/p>\n

\u4f7f\u7528 SYSDATE \u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u6233<\/h3>\n

SYSDATE \u53ef\u4ee5\u76f4\u63a5\u7528\u5728 SQL \u67e5\u8be2\u4e2d\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

SELECT SYSDATE FROM dual;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u7ed3\u679c\u5c06\u662f\u4e00\u4e2a\u65f6\u95f4\u6233\uff0c\u683c\u5f0f\u4e3a YYYY-MM-DD HH:MM:SS.FF\u3002\u4f8b\u5982\uff1a<\/p>\n
2023-03-08 14:32:15.123<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4f7f\u7528 CURRENT_TIMESTAMP \u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u6233<\/h3>\n
SYSDATE \u548c CURRENT_TIMESTAMP \u901a\u5e38\u53ef\u4ee5\u4e92\u6362\u4f7f\u7528\u3002\u4f46 CURRENT_TIMESTAMP \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u5177\u6709\u4f18\u52bf\u3002<\/p>\n
    \n
  •  \u65f6\u533a\u611f\u77e5\uff1a<\/strong> CURRENT_TIMESTAMP \u8003\u8651\u4f1a\u8bdd\u65f6\u533a\uff0c\u800c SYSDATE \u59cb\u7ec8\u8fd4\u56de\u670d\u52a1\u5668\u65f6\u533a\u7684\u65f6\u95f4\u3002<\/li>\n
  •  \u66f4\u65b0\u503c\uff1a<\/strong> CURRENT_TIMESTAMP \u6bcf\u6b21\u67e5\u8be2\u6267\u884c\u65f6\u90fd\u4f1a\u66f4\u65b0\u5176\u503c\uff0c\u800c SYSDATE \u4fdd\u6301\u4e0d\u53d8\u3002<\/li>\n<\/ul>\n
    \u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8be2\u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u6233\uff0c\u5e76\u8003\u8651\u4f1a\u8bdd\u65f6\u533a\uff1a<\/p>\n
    SELECT CURRENT_TIMESTAMP FROM dual;<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \u63d0\u53d6\u65f6\u95f4\u7ec4\u4ef6<\/h3>\n
    \u5982\u679c\u9700\u8981\u63d0\u53d6\u65f6\u95f4\u6233\u7684\u7279\u5b9a\u7ec4\u4ef6\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u51fd\u6570\uff1a<\/p>\n
      \n
    •  \u5c0f\u65f6\uff1a<\/strong> EXTRACT(HOUR FROM ) <\/li>\n
    •  \u5206\u949f\uff1a<\/strong> EXTRACT(MINUTE FROM ) <\/li>\n
    •  \u79d2\uff1a<\/strong> EXTRACT(SECOND FROM ) <\/li>\n<\/ul>\n
      \u4f8b\u5982\uff0c\u8981\u83b7\u53d6\u5f53\u524d\u5c0f\u65f6\uff1a<\/p>\n
      SELECT EXTRACT(HOUR FROM SYSDATE) FROM dual;<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\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":"
      \u5728 oracle \u4e2d\u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u53ef\u4ee5\u4f7f\u7528 sysdate \u6216 current_timestamp \u7cfb\u7edf\u53d8\u91cf\uff0c\u5b83\u4eec\u5206\u522b\u8fd4\u56de\u670d\u52a1\u5668\u5f53\u524d\u65f6\u95f4\u6233\u6216\u8003\u8651\u4f1a\u8bdd\u65f6\u533a\u7684\u65f6\u95f4\u6233\u3002\u6b64\u5916\uff0c\u53ef\u4ee5\u4f7f\u7528 extract \u51fd\u6570\u63d0\u53d6\u65f6\u95f4\u6233\u7684\u7279\u5b9a\u7ec4\u4ef6\uff0c\u5982\u5c0f\u65f6\u3001\u5206\u949f\u3001\u79d2\u3002 \u5982\u4f55\u5728 Oracle \u4e2d\u83b7\u53d6\u5f53\u524d\u65f6\u95f4 \u5728 Oracle \u6570\u636e\u5e93\u4e2d\uff0c\u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u53ef\u4ee5\u4f7f\u7528 SYSDATE \u7cfb\u7edf\u53d8\u91cf\u3002\u5b83\u8fd4\u56de\u670d\u52a1\u5668\u5f53\u524d\u65f6\u95f4\u6233\u3002 \u4f7f\u7528 SYSDATE \u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u6233 SYSDATE \u53ef\u4ee5\u76f4\u63a5\u7528\u5728 SQL \u67e5\u8be2\u4e2d\uff0c\u5982\u4e0b\u6240\u793a\uff1a SELECT SYSDATE FROM dual; \u767b\u5f55\u540e\u590d\u5236 \u7ed3\u679c\u5c06\u662f\u4e00\u4e2a\u65f6\u95f4\u6233\uff0c\u683c\u5f0f\u4e3a YYYY-MM-DD HH:MM:SS.FF\u3002\u4f8b\u5982\uff1a 2023-03-08 14:32:15.123 \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528 CURRENT_TIMESTAMP \u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u6233 SYSDATE \u548c CURRENT_TIMESTAMP \u901a\u5e38\u53ef\u4ee5\u4e92\u6362\u4f7f\u7528\u3002\u4f46 CURRENT_TIMESTAMP \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u5177\u6709\u4f18\u52bf\u3002 \u65f6\u533a\u611f\u77e5\uff1a CURRENT_TIMESTAMP \u8003\u8651\u4f1a\u8bdd\u65f6\u533a\uff0c\u800c SYSDATE \u59cb\u7ec8\u8fd4\u56de\u670d\u52a1\u5668\u65f6\u533a\u7684\u65f6\u95f4\u3002 \u66f4\u65b0\u503c\uff1a CURRENT_TIMESTAMP \u6bcf\u6b21\u67e5\u8be2\u6267\u884c\u65f6\u90fd\u4f1a\u66f4\u65b0\u5176\u503c\uff0c\u800c SYSDATE \u4fdd\u6301\u4e0d\u53d8\u3002 \u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8be2\u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u6233\uff0c\u5e76\u8003\u8651\u4f1a\u8bdd\u65f6\u533a\uff1a […]<\/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-5305","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5305","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=5305"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5305\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5305"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5305"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5305"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}