{"id":95318,"date":"2024-10-20T00:03:17","date_gmt":"2024-10-19T16:03:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95318\/"},"modified":"2024-10-20T00:03:17","modified_gmt":"2024-10-19T16:03:17","slug":"oracle%e6%97%a5%e6%9c%9f%e6%93%8d%e4%bd%9c%e5%85%a8%e6%94%bb%e7%95%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95318\/","title":{"rendered":"Oracle\u65e5\u671f\u64cd\u4f5c\u5168\u653b\u7565"},"content":{"rendered":"<h1 id=\"oracle%e6%97%a5%e6%9c%9f%e6%93%8d%e4%bd%9c%e5%85%a8%e6%94%bb%e7%95%a5-pdAhtYdwHI\">Oracle\u65e5\u671f\u64cd\u4f5c\u5168\u653b\u7565<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u65e5\u671f\u548c\u6642\u9593\u7684\u64cd\u4f5c\u662f\u975e\u5e38\u91cd\u8981\u7684\u4e00\u74b0\u3002Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\uff0c\u9019\u4e9b\u529f\u80fd\u4e0d\u50c5\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u9032\u884c\u6578\u64da\u67e5\u8a62\uff0c\u9084\u80fd\u9032\u884c\u6578\u64da\u5206\u6790\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eOracle\u4e2d\u7684\u65e5\u671f\u64cd\u4f5c\uff0c\u5305\u62ec\u65e5\u671f\u683c\u5f0f\u3001\u65e5\u671f\u8a08\u7b97\u3001\u65e5\u671f\u51fd\u6578\u7b49\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u9019\u4e9b\u529f\u80fd\u3002<\/p>\n<h2 id=\"1-%e6%97%a5%e6%9c%9f%e6%a0%bc%e5%bc%8f-pdAhtYdwHI\">1. \u65e5\u671f\u683c\u5f0f<\/h2>\n<p>\u5728Oracle\u4e2d\uff0c\u65e5\u671f\u7684\u5b58\u5132\u683c\u5f0f\u662f\u56fa\u5b9a\u7684\uff0c\u901a\u5e38\u4f7f\u7528DATE\u6578\u64da\u985e\u578b\u3002DATE\u985e\u578b\u4e0d\u50c5\u5b58\u5132\u65e5\u671f\uff0c\u9084\u5b58\u5132\u6642\u9593\u3002Oracle\u7684\u9ed8\u8a8d\u65e5\u671f\u683c\u5f0f\u70ba &#8216;DD-MON-YY&#8217;\uff0c\u4f8b\u5982 &#8217;01-JAN-23&#8217;\u3002\u7528\u6236\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u4f86\u67e5\u8a62\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\uff1a<\/p>\n<pre><code>SELECT SYSDATE FROM dual;<\/code><\/pre>\n<p>\u5982\u679c\u9700\u8981\u81ea\u5b9a\u7fa9\u65e5\u671f\u683c\u5f0f\uff0c\u53ef\u4ee5\u4f7f\u7528TO_CHAR\u51fd\u6578\u3002\u4f8b\u5982\uff0c\u5c07\u65e5\u671f\u683c\u5f0f\u5316\u70ba &#8216;YYYY-MM-DD&#8217;\uff1a<\/p>\n<pre><code>SELECT TO_CHAR(SYSDATE, 'YYYY-MM-DD') FROM dual;<\/code><\/pre>\n<h2 id=\"2-%e6%97%a5%e6%9c%9f%e8%a8%88%e7%ae%97-pdAhtYdwHI\">2. \u65e5\u671f\u8a08\u7b97<\/h2>\n<p>Oracle\u5141\u8a31\u7528\u6236\u9032\u884c\u65e5\u671f\u7684\u52a0\u6e1b\u904b\u7b97\u3002\u65e5\u671f\u4e4b\u9593\u7684\u5dee\u7570\u53ef\u4ee5\u7528\u4f86\u8a08\u7b97\u5929\u6578\u3002\u4f8b\u5982\uff0c\u8a08\u7b97\u4eca\u5929\u8207\u67d0\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5929\u6578\uff1a<\/p>\n<pre><code>SELECT SYSDATE - TO_DATE('2023-01-01', 'YYYY-MM-DD') AS days_difference FROM dual;<\/code><\/pre>\n<p>\u6b64\u5916\uff0c\u7528\u6236\u9084\u53ef\u4ee5\u901a\u904e\u52a0\u6e1b\u5929\u6578\u4f86\u7372\u5f97\u65b0\u7684\u65e5\u671f\u3002\u4f8b\u5982\uff0c\u7372\u53d6\u672a\u4f86\u4e03\u5929\u7684\u65e5\u671f\uff1a<\/p>\n<pre><code>SELECT SYSDATE + 7 AS future_date FROM dual;<\/code><\/pre>\n<h2 id=\"3-%e6%97%a5%e6%9c%9f%e5%87%bd%e6%95%b8-pdAhtYdwHI\">3. \u65e5\u671f\u51fd\u6578<\/h2>\n<p>Oracle\u63d0\u4f9b\u4e86\u591a\u7a2e\u5167\u5efa\u7684\u65e5\u671f\u51fd\u6578\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u51fd\u6578\uff1a<\/p>\n<ul>\n<li><strong>ADD_MONTHS(date, n)<\/strong>\uff1a\u5c07\u6307\u5b9a\u7684\u6708\u4efd\u6578\u52a0\u5230\u65e5\u671f\u4e0a\u3002<\/li>\n<li><strong>LAST_DAY(date)<\/strong>\uff1a\u8fd4\u56de\u6307\u5b9a\u65e5\u671f\u6240\u5728\u6708\u4efd\u7684\u6700\u5f8c\u4e00\u5929\u3002<\/li>\n<li><strong>NEXT_DAY(date, &#8216;day_name&#8217;)<\/strong>\uff1a\u8fd4\u56de\u6307\u5b9a\u65e5\u671f\u4e4b\u5f8c\u7684\u4e0b\u4e00\u500b\u6307\u5b9a\u661f\u671f\u5e7e\u7684\u65e5\u671f\u3002<\/li>\n<li><strong>TRUNC(date)<\/strong>\uff1a\u5c07\u65e5\u671f\u622a\u65b7\u5230\u6307\u5b9a\u7684\u7cbe\u5ea6\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528ADD_MONTHS\u51fd\u6578\u4f86\u8a08\u7b97\u7576\u524d\u65e5\u671f\u7684\u4e09\u500b\u6708\u5f8c\u7684\u65e5\u671f\uff1a<\/p>\n<pre><code>SELECT ADD_MONTHS(SYSDATE, 3) AS three_months_later FROM dual;<\/code><\/pre>\n<h2 id=\"4-%e6%97%a5%e6%9c%9f%e7%9a%84%e6%af%94%e8%bc%83-pdAhtYdwHI\">4. \u65e5\u671f\u7684\u6bd4\u8f03<\/h2>\n<p>\u5728\u9032\u884c\u6578\u64da\u67e5\u8a62\u6642\uff0c\u65e5\u671f\u7684\u6bd4\u8f03\u662f\u5e38\u898b\u7684\u9700\u6c42\u3002\u7528\u6236\u53ef\u4ee5\u4f7f\u7528\u6bd4\u8f03\u904b\u7b97\u7b26\uff08\u5982 =\u3001&gt;\u3001&lt;\uff09\u4f86\u6bd4\u8f03\u65e5\u671f\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u5728\u67d0\u500b\u65e5\u671f\u4e4b\u5f8c\u7684\u6240\u6709\u8a18\u9304\uff1a<\/p>\n<pre><code>SELECT * FROM your_table WHERE your_date_column &gt; TO_DATE('2023-01-01', 'YYYY-MM-DD');<\/code><\/pre>\n<h2 id=\"5-%e5%b0%8f%e7%b5%90-pdAhtYdwHI\">5. \u5c0f\u7d50<\/h2>\n<p>Oracle\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u65e5\u671f\u64cd\u4f5c\u529f\u80fd\uff0c\u7121\u8ad6\u662f\u683c\u5f0f\u5316\u3001\u8a08\u7b97\u9084\u662f\u6bd4\u8f03\uff0c\u90fd\u80fd\u5920\u6eff\u8db3\u7528\u6236\u7684\u9700\u6c42\u3002\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u64cd\u4f5c\u5f8c\uff0c\u7528\u6236\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u5206\u6790\u548c\u67e5\u8a62\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-pdAhtYdwHI\">\u7e3d\u7d50<\/h2>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u63a2\u8a0e\u4e86Oracle\u4e2d\u7684\u65e5\u671f\u64cd\u4f5c\uff0c\u5305\u62ec\u65e5\u671f\u683c\u5f0f\u3001\u8a08\u7b97\u3001\u51fd\u6578\u53ca\u6bd4\u8f03\u7b49\u3002\u9019\u4e9b\u77e5\u8b58\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u6578\u64da\u5206\u6790\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u5728\u9999\u6e2f\u4f7f\u7528<a href=\"https:\/\/server.hk\">VPS<\/a> \u9032\u884c\u6578\u64da\u5eab\u7ba1\u7406\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1Oracle\u65e5\u671f\u64cd\u4f5c\u7684\u5168\u9762\u6307\u5357\uff0c\u6db5\u76d6\u65e5\u671f\u683c\u5f0f\u3001\u8ba1\u7b97\u3001\u51fd\u6570\u53ca\u5e38\u89c1\u95ee\u9898\uff0c\u63d0\u5347\u6570\u636e\u5e93\u7ba1\u7406\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-95318","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95318","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=95318"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95318\/revisions"}],"predecessor-version":[{"id":95319,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95318\/revisions\/95319"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95318"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95318"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95318"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}