{"id":17612,"date":"2024-11-18T10:02:46","date_gmt":"2024-11-18T02:02:46","guid":{"rendered":"https:\/\/fwq.ai\/blog\/17612\/"},"modified":"2024-11-18T10:02:46","modified_gmt":"2024-11-18T02:02:46","slug":"oracle%e6%97%b6%e9%97%b4%e6%98%be%e7%a4%ba%e6%96%b9%e5%bc%8f%e4%bf%ae%e6%94%b9%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/17612\/","title":{"rendered":"Oracle\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\u4fee\u6539\u6280\u5de7"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/000\/465\/014\/170970066686048.jpg\" class=\"aligncenter\" title=\"Oracle\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\u4fee\u6539\u6280\u5de7\u63d2\u56fe\" alt=\"Oracle\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\u4fee\u6539\u6280\u5de7\u63d2\u56fe\" \/><\/p>\n<p>\u300aOracle\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\u4fee\u6539\u6280\u5de7\uff0c\u9700\u8981\u5177\u4f53\u4ee3\u7801\u793a\u4f8b\u300b<\/p>\n<p>\u5728Oracle\u6570\u636e\u5e93\u4e2d\uff0c\u65f6\u95f4\u7684\u663e\u793a\u662f\u5e38\u89c1\u7684\u64cd\u4f5c\u9700\u6c42\u4e4b\u4e00\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cOracle\u6570\u636e\u5e93\u4e2d\u65f6\u95f4\u7684\u663e\u793a\u683c\u5f0f\u662f\u56fa\u5b9a\u7684\uff0c\u4f46\u662f\u6709\u65f6\u5019\u6211\u4eec\u9700\u8981\u6839\u636e\u81ea\u5df1\u7684\u9700\u6c42\u8fdb\u884c\u683c\u5f0f\u5316\u663e\u793a\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u5728Oracle\u6570\u636e\u5e93\u4e2d\u4fee\u6539\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n<ol>\n<li>\u4fee\u6539\u65f6\u95f4\u663e\u793a\u683c\u5f0f<\/li>\n<\/ol>\n<p>\u5728Oracle\u6570\u636e\u5e93\u4e2d\uff0c\u65f6\u95f4\u5b57\u6bb5\u7684\u6570\u636e\u7c7b\u578b\u901a\u5e38\u4e3aDATE\u6216TIMESTAMP\uff0c\u800c\u8fd9\u4e24\u79cd\u7c7b\u578b\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u663e\u793a\u7684\u683c\u5f0f\u662f\u56fa\u5b9a\u7684\u3002\u5982\u679c\u6211\u4eec\u5e0c\u671b\u4fee\u6539\u65f6\u95f4\u7684\u663e\u793a\u65b9\u5f0f\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528TO_CHAR\u51fd\u6570\u5c06\u65f6\u95f4\u5b57\u6bb5\u8f6c\u6362\u4e3a\u6307\u5b9a\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3002TO_CHAR\u51fd\u6570\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre>SELECT TO_CHAR(time_column, 'format') FROM table_name;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u5176\u4e2d\uff0ctime_column\u4e3a\u65f6\u95f4\u5b57\u6bb5\u540d\uff0cformat\u4e3a\u65f6\u95f4\u683c\u5f0f\u5316\u6a21\u677f\u3002\u4e0b\u9762\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u65f6\u95f4\u683c\u5f0f\u5316\u6a21\u677f\u53ca\u5176\u542b\u4e49\uff1a<\/p>\n<ul>\n<li>YYYY-MM-DD HH24:MI:SS\uff1a\u5e74-\u6708-\u65e5 \u65f6:\u5206:\u79d2<\/li>\n<li>MM\/DD\/YYYY HH:MI:SS AM\uff1a\u6708\/\u65e5\/\u5e74 \u65f6:\u5206:\u79d2 \u4e0a\u5348\/\u4e0b\u5348<\/li>\n<li>DD-MON-YYYY HH12:MI:SS AM\uff1a\u65e5-\u6708-\u5e74 \u65f6:\u5206:\u79d2 \u4e0a\u5348\/\u4e0b\u5348<\/li>\n<\/ul>\n<ol>\n<li>\u5177\u4f53\u4ee3\u7801\u793a\u4f8b<\/li>\n<\/ol>\n<p>\u5047\u8bbe\u6709\u4e00\u4e2a\u540d\u4e3aemployees\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542bhire_date\u5b57\u6bb5\u8868\u793a\u5458\u5de5\u5165\u804c\u65f6\u95f4\u3002\u6211\u4eec\u5e0c\u671b\u5c06\u5165\u804c\u65f6\u95f4\u4ee5&#8221;\u5e74-\u6708-\u65e5&#8221;\u7684\u683c\u5f0f\u663e\u793a\u51fa\u6765\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8bed\u53e5\uff1a<\/p>\n<pre>SELECT TO_CHAR(hire_date, 'YYYY-MM-DD') AS hire_date_formatted\nFROM employees;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u8fd0\u884c\u4ee5\u4e0aSQL\u8bed\u53e5\u540e\uff0chire_date\u5b57\u6bb5\u5c06\u4ee5&#8221;\u5e74-\u6708-\u65e5&#8221;\u7684\u683c\u5f0f\u663e\u793a\u51fa\u6765\u3002\u5982\u679c\u9700\u8981\u663e\u793a\u5176\u4ed6\u683c\u5f0f\uff0c\u53ea\u9700\u4fee\u6539TO_CHAR\u51fd\u6570\u4e2d\u7684\u683c\u5f0f\u5316\u6a21\u677f\u5373\u53ef\u3002<\/p>\n<p>\u9664\u4e86\u4f7f\u7528TO_CHAR\u51fd\u6570\u5916\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539\u4f1a\u8bdd\u7ea7\u522b\u6216\u7cfb\u7edf\u7ea7\u522b\u7684\u65f6\u95f4\u683c\u5f0f\u53c2\u6570\u6765\u5b9e\u73b0\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\u7684\u4fee\u6539\u3002\u53ef\u4ee5\u4f7f\u7528ALTER SESSION\u8bed\u53e5\u4fee\u6539\u4f1a\u8bdd\u7ea7\u522b\u7684\u65f6\u95f4\u683c\u5f0f\u53c2\u6570\uff0c\u6216\u8005\u4f7f\u7528ALTER SYSTEM\u8bed\u53e5\u4fee\u6539\u7cfb\u7edf\u7ea7\u522b\u7684\u65f6\u95f4\u683c\u5f0f\u53c2\u6570\u3002<\/p>\n<p>\u603b\u7ed3\uff1a\u901a\u8fc7\u4ee5\u4e0a\u4ecb\u7ecd\uff0c\u6211\u4eec\u4e86\u89e3\u4e86\u5982\u4f55\u5728Oracle\u6570\u636e\u5e93\u4e2d\u4fee\u6539\u65f6\u95f4\u7684\u663e\u793a\u65b9\u5f0f\uff0c\u4e3b\u8981\u662f\u901a\u8fc7\u4f7f\u7528TO_CHAR\u51fd\u6570\u5c06\u65f6\u95f4\u5b57\u6bb5\u8f6c\u6362\u4e3a\u6307\u5b9a\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3002\u540c\u65f6\uff0c\u63d0\u4f9b\u4e86\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u6765\u6f14\u793a\u5982\u4f55\u5b9e\u73b0\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\u7684\u4fee\u6539\u3002\u5e0c\u671b\u8fd9\u4e9b\u6280\u5de7\u5bf9\u60a8\u5728Oracle\u6570\u636e\u5e93\u4e2d\u5904\u7406\u65f6\u95f4\u5b57\u6bb5\u65f6\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fOracle\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\u4fee\u6539\u6280\u5de7\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u300aOracle\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\u4fee\u6539\u6280\u5de7\uff0c\u9700\u8981\u5177\u4f53\u4ee3\u7801\u793a\u4f8b\u300b \u5728Oracle\u6570\u636e\u5e93\u4e2d\uff0c\u65f6\u95f4\u7684\u663e\u793a\u662f\u5e38\u89c1\u7684\u64cd\u4f5c\u9700\u6c42\u4e4b\u4e00\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cOracle\u6570\u636e\u5e93\u4e2d\u65f6\u95f4\u7684\u663e\u793a\u683c\u5f0f\u662f\u56fa\u5b9a\u7684\uff0c\u4f46\u662f\u6709\u65f6\u5019\u6211\u4eec\u9700\u8981\u6839\u636e\u81ea\u5df1\u7684\u9700\u6c42\u8fdb\u884c\u683c\u5f0f\u5316\u663e\u793a\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u5728Oracle\u6570\u636e\u5e93\u4e2d\u4fee\u6539\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002 \u4fee\u6539\u65f6\u95f4\u663e\u793a\u683c\u5f0f \u5728Oracle\u6570\u636e\u5e93\u4e2d\uff0c\u65f6\u95f4\u5b57\u6bb5\u7684\u6570\u636e\u7c7b\u578b\u901a\u5e38\u4e3aDATE\u6216TIMESTAMP\uff0c\u800c\u8fd9\u4e24\u79cd\u7c7b\u578b\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u663e\u793a\u7684\u683c\u5f0f\u662f\u56fa\u5b9a\u7684\u3002\u5982\u679c\u6211\u4eec\u5e0c\u671b\u4fee\u6539\u65f6\u95f4\u7684\u663e\u793a\u65b9\u5f0f\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528TO_CHAR\u51fd\u6570\u5c06\u65f6\u95f4\u5b57\u6bb5\u8f6c\u6362\u4e3a\u6307\u5b9a\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3002TO_CHAR\u51fd\u6570\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a SELECT TO_CHAR(time_column, &#8216;format&#8217;) FROM table_name; \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d\uff0ctime_column\u4e3a\u65f6\u95f4\u5b57\u6bb5\u540d\uff0cformat\u4e3a\u65f6\u95f4\u683c\u5f0f\u5316\u6a21\u677f\u3002\u4e0b\u9762\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u65f6\u95f4\u683c\u5f0f\u5316\u6a21\u677f\u53ca\u5176\u542b\u4e49\uff1a YYYY-MM-DD HH24:MI:SS\uff1a\u5e74-\u6708-\u65e5 \u65f6:\u5206:\u79d2 MM\/DD\/YYYY HH:MI:SS AM\uff1a\u6708\/\u65e5\/\u5e74 \u65f6:\u5206:\u79d2 \u4e0a\u5348\/\u4e0b\u5348 DD-MON-YYYY HH12:MI:SS AM\uff1a\u65e5-\u6708-\u5e74 \u65f6:\u5206:\u79d2 \u4e0a\u5348\/\u4e0b\u5348 \u5177\u4f53\u4ee3\u7801\u793a\u4f8b \u5047\u8bbe\u6709\u4e00\u4e2a\u540d\u4e3aemployees\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542bhire_date\u5b57\u6bb5\u8868\u793a\u5458\u5de5\u5165\u804c\u65f6\u95f4\u3002\u6211\u4eec\u5e0c\u671b\u5c06\u5165\u804c\u65f6\u95f4\u4ee5&#8221;\u5e74-\u6708-\u65e5&#8221;\u7684\u683c\u5f0f\u663e\u793a\u51fa\u6765\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8bed\u53e5\uff1a SELECT TO_CHAR(hire_date, &#8216;YYYY-MM-DD&#8217;) AS hire_date_formatted FROM employees; \u767b\u5f55\u540e\u590d\u5236 \u8fd0\u884c\u4ee5\u4e0aSQL\u8bed\u53e5\u540e\uff0chire_date\u5b57\u6bb5\u5c06\u4ee5&#8221;\u5e74-\u6708-\u65e5&#8221;\u7684\u683c\u5f0f\u663e\u793a\u51fa\u6765\u3002\u5982\u679c\u9700\u8981\u663e\u793a\u5176\u4ed6\u683c\u5f0f\uff0c\u53ea\u9700\u4fee\u6539TO_CHAR\u51fd\u6570\u4e2d\u7684\u683c\u5f0f\u5316\u6a21\u677f\u5373\u53ef\u3002 \u9664\u4e86\u4f7f\u7528TO_CHAR\u51fd\u6570\u5916\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539\u4f1a\u8bdd\u7ea7\u522b\u6216\u7cfb\u7edf\u7ea7\u522b\u7684\u65f6\u95f4\u683c\u5f0f\u53c2\u6570\u6765\u5b9e\u73b0\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\u7684\u4fee\u6539\u3002\u53ef\u4ee5\u4f7f\u7528ALTER SESSION\u8bed\u53e5\u4fee\u6539\u4f1a\u8bdd\u7ea7\u522b\u7684\u65f6\u95f4\u683c\u5f0f\u53c2\u6570\uff0c\u6216\u8005\u4f7f\u7528ALTER SYSTEM\u8bed\u53e5\u4fee\u6539\u7cfb\u7edf\u7ea7\u522b\u7684\u65f6\u95f4\u683c\u5f0f\u53c2\u6570\u3002 \u603b\u7ed3\uff1a\u901a\u8fc7\u4ee5\u4e0a\u4ecb\u7ecd\uff0c\u6211\u4eec\u4e86\u89e3\u4e86\u5982\u4f55\u5728Oracle\u6570\u636e\u5e93\u4e2d\u4fee\u6539\u65f6\u95f4\u7684\u663e\u793a\u65b9\u5f0f\uff0c\u4e3b\u8981\u662f\u901a\u8fc7\u4f7f\u7528TO_CHAR\u51fd\u6570\u5c06\u65f6\u95f4\u5b57\u6bb5\u8f6c\u6362\u4e3a\u6307\u5b9a\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3002\u540c\u65f6\uff0c\u63d0\u4f9b\u4e86\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u6765\u6f14\u793a\u5982\u4f55\u5b9e\u73b0\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\u7684\u4fee\u6539\u3002\u5e0c\u671b\u8fd9\u4e9b\u6280\u5de7\u5bf9\u60a8\u5728Oracle\u6570\u636e\u5e93\u4e2d\u5904\u7406\u65f6\u95f4\u5b57\u6bb5\u65f6\u6709\u6240\u5e2e\u52a9\u3002 \u4ee5\u4e0a\u5c31\u662fOracle\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\u4fee\u6539\u6280\u5de7\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-17612","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/17612","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=17612"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/17612\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=17612"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=17612"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=17612"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}