{"id":51529,"date":"2024-12-03T15:47:34","date_gmt":"2024-12-03T07:47:34","guid":{"rendered":"https:\/\/fwq.ai\/blog\/51529\/"},"modified":"2024-12-03T15:47:34","modified_gmt":"2024-12-03T07:47:34","slug":"%e6%94%b9%e5%8f%98oracle%e6%97%b6%e9%97%b4%e6%98%be%e7%a4%ba%e6%a0%bc%e5%bc%8f%e7%9a%84%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/51529\/","title":{"rendered":"\u6539\u53d8Oracle\u65f6\u95f4\u663e\u793a\u683c\u5f0f\u7684\u65b9\u6cd5"},"content":{"rendered":"

<\/b> <\/p>\n

\u6539\u53d8Oracle\u65f6\u95f4\u663e\u793a\u683c\u5f0f\u7684\u65b9\u6cd5<\/h1>\n

\u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300a\u6539\u53d8Oracle\u65f6\u95f4\u663e\u793a\u683c\u5f0f\u7684\u65b9\u6cd5\u300b\uff0c\u4e3b\u8981\u5305\u62ec\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002<\/p>\n

\u300aOracle\u65f6\u95f4\u663e\u793a\u65b9\u5f0f\u4fee\u6539\u6280\u5de7\uff0c\u9700\u8981\u5177\u4f53\u4ee3\u7801\u793a\u4f8b\u300b<\/p>\n

\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

    \n
  1. \u4fee\u6539\u65f6\u95f4\u663e\u793a\u683c\u5f0f<\/li>\n<\/ol>\n

    \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

    SELECT TO_CHAR(time_column, 'format') FROM table_name;<\/pre>\n
    \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
      \n
    • YYYY-MM-DD HH24:MI:SS\uff1a\u5e74-\u6708-\u65e5 \u65f6:\u5206:\u79d2<\/li>\n
    • MM\/DD\/YYYY HH:MI:SS AM\uff1a\u6708\/\u65e5\/\u5e74 \u65f6:\u5206:\u79d2 \u4e0a\u5348\/\u4e0b\u5348<\/li>\n
    • DD-MON-YYYY HH12:MI:SS AM\uff1a\u65e5-\u6708-\u5e74 \u65f6:\u5206:\u79d2 \u4e0a\u5348\/\u4e0b\u5348<\/li>\n<\/ul>\n
        \n
      1. \u5177\u4f53\u4ee3\u7801\u793a\u4f8b<\/li>\n<\/ol>\n
        \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”\u5e74-\u6708-\u65e5”\u7684\u683c\u5f0f\u663e\u793a\u51fa\u6765\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8bed\u53e5\uff1a<\/p>\n
        SELECT TO_CHAR(hire_date, 'YYYY-MM-DD') AS hire_date_formatted\nFROM employees;<\/pre>\n
        \u8fd0\u884c\u4ee5\u4e0aSQL\u8bed\u53e5\u540e\uff0chire_date\u5b57\u6bb5\u5c06\u4ee5”\u5e74-\u6708-\u65e5”\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
        \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
        \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
        \u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6587\u7ae0\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n
        \n
        <\/dt>\n
        \n   \u63a7\u5236\u65e5\u5fd7\u7684\u65b9\u6cd5\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
        \u6539\u53d8Oracle\u65f6\u95f4\u663e\u793a\u683c\u5f0f\u7684\u65b9\u6cd5 \u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300a\u6539\u53d8Oracle\u65f6\u95f4\u663e\u793a\u683c\u5f0f\u7684\u65b9\u6cd5\u300b\uff0c\u4e3b\u8981\u5305\u62ec\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002 \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, ‘format’) FROM table_name; \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”\u5e74-\u6708-\u65e5”\u7684\u683c\u5f0f\u663e\u793a\u51fa\u6765\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8bed\u53e5\uff1a SELECT TO_CHAR(hire_date, ‘YYYY-MM-DD’) AS hire_date_formatted FROM employees; \u8fd0\u884c\u4ee5\u4e0aSQL\u8bed\u53e5\u540e\uff0chire_date\u5b57\u6bb5\u5c06\u4ee5”\u5e74-\u6708-\u65e5”\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 \u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6587\u7ae0\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~ \u63a7\u5236\u65e5\u5fd7\u7684\u65b9\u6cd5<\/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-51529","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/51529","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=51529"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/51529\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=51529"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=51529"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=51529"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}