{"id":94956,"date":"2024-10-19T21:02:17","date_gmt":"2024-10-19T13:02:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94956\/"},"modified":"2024-10-19T21:02:17","modified_gmt":"2024-10-19T13:02:17","slug":"oracle%e5%b8%b8%e7%94%a8%e6%97%a5%e6%9c%9f%e8%bd%89%e6%8f%9b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94956\/","title":{"rendered":"Oracle\u5e38\u7528\u65e5\u671f\u8f49\u63db"},"content":{"rendered":"<h1 id=\"oracle%e5%b8%b8%e7%94%a8%e6%97%a5%e6%9c%9f%e8%bd%89%e6%8f%9b-GOQXIZLYuF\">Oracle\u5e38\u7528\u65e5\u671f\u8f49\u63db<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0c\u65e5\u671f\u548c\u6642\u9593\u7684\u8655\u7406\u662f\u975e\u5e38\u91cd\u8981\u7684\u4e00\u74b0\u3002Oracle\u8cc7\u6599\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u4f86\u9032\u884c\u65e5\u671f\u8f49\u63db\uff0c\u9019\u4e9b\u51fd\u6578\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5728\u4e0d\u540c\u7684\u65e5\u671f\u683c\u5f0f\u4e4b\u9593\u9032\u884c\u8f49\u63db\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u53ef\u8b80\u6027\u548c\u53ef\u64cd\u4f5c\u6027\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u5e38\u7528\u7684Oracle\u65e5\u671f\u8f49\u63db\u51fd\u6578\u53ca\u5176\u7528\u6cd5\u3002<\/p>\n<h2 id=\"1-to_date%e5%87%bd%e6%95%b8-GOQXIZLYuF\">1. TO_DATE\u51fd\u6578<\/h2>\n<p>TO_DATE\u51fd\u6578\u7528\u65bc\u5c07\u5b57\u4e32\u8f49\u63db\u70ba\u65e5\u671f\u683c\u5f0f\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>TO_DATE('\u5b57\u4e32', '\u683c\u5f0f')<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u6709\u4e00\u500b\u5b57\u4e32&#8217;2023-10-01&#8217;\uff0c\u60f3\u5c07\u5176\u8f49\u63db\u70ba\u65e5\u671f\u683c\u5f0f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT TO_DATE('2023-10-01', 'YYYY-MM-DD') FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u4e00\u500b\u65e5\u671f\u985e\u578b\u7684\u503c\uff0c\u8868\u793a2023\u5e7410\u67081\u65e5\u3002<\/p>\n<h2 id=\"2-to_char%e5%87%bd%e6%95%b8-GOQXIZLYuF\">2. TO_CHAR\u51fd\u6578<\/h2>\n<p>TO_CHAR\u51fd\u6578\u5247\u662f\u5c07\u65e5\u671f\u8f49\u63db\u70ba\u5b57\u4e32\u683c\u5f0f\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>TO_CHAR(\u65e5\u671f, '\u683c\u5f0f')<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07\u7576\u524d\u65e5\u671f\u8f49\u63db\u70ba&#8217;YYYY\/MM\/DD&#8217;\u683c\u5f0f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT TO_CHAR(SYSDATE, 'YYYY\/MM\/DD') FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u7576\u524d\u65e5\u671f\u7684\u5b57\u4e32\u8868\u793a\uff0c\u4f8b\u5982&#8217;2023\/10\/01&#8217;\u3002<\/p>\n<h2 id=\"3-extract%e5%87%bd%e6%95%b8-GOQXIZLYuF\">3. EXTRACT\u51fd\u6578<\/h2>\n<p>EXTRACT\u51fd\u6578\u7528\u65bc\u5f9e\u65e5\u671f\u4e2d\u63d0\u53d6\u7279\u5b9a\u7684\u90e8\u5206\uff0c\u5982\u5e74\u3001\u6708\u3001\u65e5\u7b49\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>EXTRACT(\u90e8\u5206 FROM \u65e5\u671f)<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e\u7576\u524d\u65e5\u671f\u4e2d\u63d0\u53d6\u5e74\u4efd\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT EXTRACT(YEAR FROM SYSDATE) FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u7576\u524d\u5e74\u4efd\uff0c\u4f8b\u59822023\u3002<\/p>\n<h2 id=\"4-add_months%e5%87%bd%e6%95%b8-GOQXIZLYuF\">4. ADD_MONTHS\u51fd\u6578<\/h2>\n<p>ADD_MONTHS\u51fd\u6578\u7528\u65bc\u5728\u6307\u5b9a\u65e5\u671f\u4e0a\u589e\u52a0\u6216\u6e1b\u5c11\u6708\u4efd\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ADD_MONTHS(\u65e5\u671f, \u6578\u91cf)<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5728\u7576\u524d\u65e5\u671f\u4e0a\u589e\u52a03\u500b\u6708\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT ADD_MONTHS(SYSDATE, 3) FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u4e09\u500b\u6708\u5f8c\u7684\u65e5\u671f\u3002<\/p>\n<h2 id=\"5-last_day%e5%87%bd%e6%95%b8-GOQXIZLYuF\">5. LAST_DAY\u51fd\u6578<\/h2>\n<p>LAST_DAY\u51fd\u6578\u7528\u65bc\u8fd4\u56de\u6307\u5b9a\u65e5\u671f\u6240\u5728\u6708\u4efd\u7684\u6700\u5f8c\u4e00\u5929\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>LAST_DAY(\u65e5\u671f)<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u7372\u53d6\u7576\u524d\u6708\u4efd\u7684\u6700\u5f8c\u4e00\u5929\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT LAST_DAY(SYSDATE) FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u7576\u524d\u6708\u4efd\u7684\u6700\u5f8c\u4e00\u5929\u3002<\/p>\n<h2 id=\"6-%e6%97%a5%e6%9c%9f%e6%a0%bc%e5%bc%8f%e5%8c%96-GOQXIZLYuF\">6. \u65e5\u671f\u683c\u5f0f\u5316<\/h2>\n<p>\u5728\u4f7f\u7528TO_CHAR\u51fd\u6578\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u7a2e\u683c\u5f0f\u4f86\u986f\u793a\u65e5\u671f\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u683c\u5f0f\uff1a<\/p>\n<ul>\n<li><code>YYYY<\/code> &#8211; \u56db\u4f4d\u6578\u5e74\u4efd<\/li>\n<li><code>MM<\/code> &#8211; \u6708\u4efd\uff0801-12\uff09<\/li>\n<li><code>DD<\/code> &#8211; \u65e5\u671f\uff0801-31\uff09<\/li>\n<li><code>HH24<\/code> &#8211; 24\u5c0f\u6642\u5236\u5c0f\u6642<\/li>\n<li><code>MI<\/code> &#8211; \u5206\u9418<\/li>\n<li><code>SS<\/code> &#8211; \u79d2<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5c07\u7576\u524d\u65e5\u671f\u683c\u5f0f\u5316\u70ba&#8217;YYYY-MM-DD HH24:MI:SS&#8217;\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT TO_CHAR(SYSDATE, 'YYYY-MM-DD HH24:MI:SS') FROM dual;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-GOQXIZLYuF\">\u7e3d\u7d50<\/h2>\n<p>Oracle\u63d0\u4f9b\u4e86\u591a\u7a2e\u65e5\u671f\u8f49\u63db\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5728\u4e0d\u540c\u7684\u65e5\u671f\u683c\u5f0f\u4e4b\u9593\u9032\u884c\u8f49\u63db\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u53ef\u8b80\u6027\u548c\u53ef\u64cd\u4f5c\u6027\u3002\u7121\u8ad6\u662f\u5c07\u5b57\u4e32\u8f49\u63db\u70ba\u65e5\u671f\uff0c\u9084\u662f\u5c07\u65e5\u671f\u683c\u5f0f\u5316\u70ba\u5b57\u4e32\uff0cOracle\u7684\u65e5\u671f\u51fd\u6578\u90fd\u80fd\u5920\u6eff\u8db3\u7528\u6236\u7684\u9700\u6c42\u3002\u5c0d\u65bc\u9700\u8981\u8655\u7406\u5927\u91cf\u65e5\u671f\u6578\u64da\u7684\u61c9\u7528\u5834\u666f\uff0c\u638c\u63e1\u9019\u4e9b\u51fd\u6578\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u61c9\u7528\u4e2d\u4f7f\u7528\u9019\u4e9b\u65e5\u671f\u8f49\u63db\u51fd\u6578\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u6216\u8005\u9700\u8981\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u4e2d\u5e38\u7528\u7684\u65e5\u671f\u8f49\u63db\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u8f15\u9b06\u7ba1\u7406\u548c\u683c\u5f0f\u5316\u65e5\u671f\u4fe1\u606f\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-94956","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94956","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=94956"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94956\/revisions"}],"predecessor-version":[{"id":94957,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94956\/revisions\/94957"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94956"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94956"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94956"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}