{"id":95320,"date":"2024-10-20T00:04:19","date_gmt":"2024-10-19T16:04:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95320\/"},"modified":"2024-10-20T00:04:19","modified_gmt":"2024-10-19T16:04:19","slug":"oracle%e6%97%a5%e6%9c%9f%e8%bd%89%e6%8f%9b%e5%87%bd%e6%95%b8%e7%9a%84%e8%aa%9e%e6%b3%95%e4%bb%8b%e7%b4%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95320\/","title":{"rendered":"Oracle\u65e5\u671f\u8f49\u63db\u51fd\u6578\u7684\u8a9e\u6cd5\u4ecb\u7d39"},"content":{"rendered":"<h1 id=\"oracle%e6%97%a5%e6%9c%9f%e8%bd%89%e6%8f%9b%e5%87%bd%e6%95%b8%e7%9a%84%e8%aa%9e%e6%b3%95%e4%bb%8b%e7%b4%b9-fwuiFHIGUQ\">Oracle\u65e5\u671f\u8f49\u63db\u51fd\u6578\u7684\u8a9e\u6cd5\u4ecb\u7d39<\/h1>\n<p>\u5728Oracle\u8cc7\u6599\u5eab\u4e2d\uff0c\u65e5\u671f\u548c\u6642\u9593\u7684\u8655\u7406\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u5c24\u5176\u662f\u5728\u9032\u884c\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u6642\u3002Oracle\u63d0\u4f9b\u4e86\u591a\u7a2e\u65e5\u671f\u8f49\u63db\u51fd\u6578\uff0c\u5e6b\u52a9\u7528\u6236\u5728\u4e0d\u540c\u7684\u65e5\u671f\u683c\u5f0f\u4e4b\u9593\u9032\u884c\u8f49\u63db\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5e7e\u500b\u5e38\u7528\u7684\u65e5\u671f\u8f49\u63db\u51fd\u6578\u53ca\u5176\u8a9e\u6cd5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u3002<\/p>\n<h2 id=\"1-to_date%e5%87%bd%e6%95%b8-fwuiFHIGUQ\">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(string, format)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>string<\/code>\u662f\u8981\u8f49\u63db\u7684\u5b57\u4e32\uff0c<code>format<\/code>\u662f\u6307\u5b9a\u5b57\u4e32\u683c\u5f0f\u7684\u6a21\u5f0f\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u65e5\u671f\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\uff0800-23\uff09<\/li>\n<li><code>MI<\/code> &#8211; \u5206\u9418\uff0800-59\uff09<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5c07\u5b57\u4e32&#8217;2023-10-01&#8217;\u8f49\u63db\u70ba\u65e5\u671f\u683c\u5f0f\uff1a<\/p>\n<pre><code>SELECT TO_DATE('2023-10-01', 'YYYY-MM-DD') FROM dual;<\/code><\/pre>\n<h2 id=\"2-to_char%e5%87%bd%e6%95%b8-fwuiFHIGUQ\">2. TO_CHAR\u51fd\u6578<\/h2>\n<p>TO_CHAR\u51fd\u6578\u7528\u65bc\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(date, format)<\/code><\/pre>\n<p>\u9019\u88e1\u7684<code>date<\/code>\u662f\u8981\u8f49\u63db\u7684\u65e5\u671f\uff0c<code>format<\/code>\u662f\u6307\u5b9a\u8f38\u51fa\u5b57\u4e32\u683c\u5f0f\u7684\u6a21\u5f0f\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u5b57\u4e32\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\uff0800-23\uff09<\/li>\n<li><code>MI<\/code> &#8211; \u5206\u9418\uff0800-59\uff09<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5c07\u7576\u524d\u65e5\u671f\u8f49\u63db\u70ba&#8217;YYYY\/MM\/DD&#8217;\u683c\u5f0f\uff1a<\/p>\n<pre><code>SELECT TO_CHAR(SYSDATE, 'YYYY\/MM\/DD') FROM dual;<\/code><\/pre>\n<h2 id=\"3-trunc%e5%87%bd%e6%95%b8-fwuiFHIGUQ\">3. TRUNC\u51fd\u6578<\/h2>\n<p>TRUNC\u51fd\u6578\u7528\u65bc\u5c07\u65e5\u671f\u622a\u65b7\u5230\u6307\u5b9a\u7684\u7cbe\u5ea6\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>TRUNC(date, format)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>format<\/code>\u53ef\u4ee5\u662f\u4ee5\u4e0b\u503c\uff1a<\/p>\n<ul>\n<li><code>'YYYY'<\/code> &#8211; \u622a\u65b7\u5230\u5e74\u4efd<\/li>\n<li><code>'MM'<\/code> &#8211; \u622a\u65b7\u5230\u6708\u4efd<\/li>\n<li><code>'DD'<\/code> &#8211; \u622a\u65b7\u5230\u65e5\u671f<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5c07\u7576\u524d\u65e5\u671f\u622a\u65b7\u5230\u6708\u4efd\uff1a<\/p>\n<pre><code>SELECT TRUNC(SYSDATE, 'MM') FROM dual;<\/code><\/pre>\n<h2 id=\"4-add_months%e5%87%bd%e6%95%b8-fwuiFHIGUQ\">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(date, n)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>n<\/code>\u662f\u8981\u589e\u52a0\u7684\u6708\u4efd\u6578\uff08\u53ef\u4ee5\u662f\u8ca0\u6578\u4ee5\u6e1b\u5c11\u6708\u4efd\uff09\u3002\u4f8b\u5982\uff0c\u5c07\u7576\u524d\u65e5\u671f\u589e\u52a03\u500b\u6708\uff1a<\/p>\n<pre><code>SELECT ADD_MONTHS(SYSDATE, 3) FROM dual;<\/code><\/pre>\n<h2 id=\"5-months_between%e5%87%bd%e6%95%b8-fwuiFHIGUQ\">5. MONTHS_BETWEEN\u51fd\u6578<\/h2>\n<p>MONTHS_BETWEEN\u51fd\u6578\u7528\u65bc\u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u6708\u4efd\u6578\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>MONTHS_BETWEEN(date1, date2)<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u8a08\u7b97&#8217;2023-10-01&#8217;\u548c&#8217;2023-01-01&#8217;\u4e4b\u9593\u7684\u6708\u4efd\u6578\uff1a<\/p>\n<pre><code>SELECT MONTHS_BETWEEN(TO_DATE('2023-10-01', 'YYYY-MM-DD'), TO_DATE('2023-01-01', 'YYYY-MM-DD')) FROM dual;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-fwuiFHIGUQ\">\u7e3d\u7d50<\/h2>\n<p>Oracle\u63d0\u4f9b\u4e86\u591a\u7a2e\u65e5\u671f\u8f49\u63db\u51fd\u6578\uff0c\u5e6b\u52a9\u7528\u6236\u5728\u4e0d\u540c\u7684\u65e5\u671f\u683c\u5f0f\u4e4b\u9593\u9032\u884c\u8f49\u63db\u3002\u901a\u904e\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u9748\u6d3b\u5730\u8655\u7406\u65e5\u671f\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u5206\u6790\u7684\u6548\u7387\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u5728\u60a8\u7684\u61c9\u7528\u4e2d\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\uff0c\u6216\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u65e5\u671f\u8f49\u63db\u51fd\u6578\u7684\u8a9e\u6cd5\uff0c\u638c\u63e1\u5982\u4f55\u6709\u6548\u8655\u7406\u548c\u683c\u5f0f\u5316\u65e5\u671f\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u5eab\u64cd\u4f5c\u6548\u7387\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-95320","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95320","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=95320"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95320\/revisions"}],"predecessor-version":[{"id":95321,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95320\/revisions\/95321"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95320"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95320"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95320"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}