{"id":95066,"date":"2024-10-19T21:57:17","date_gmt":"2024-10-19T13:57:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95066\/"},"modified":"2024-10-19T21:57:17","modified_gmt":"2024-10-19T13:57:17","slug":"oracle%e5%96%ae%e8%a1%8c%e6%97%a5%e6%9c%9f%e5%87%bd%e6%95%b8%e7%b0%a1%e4%bb%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95066\/","title":{"rendered":"Oracle\u55ae\u884c\u65e5\u671f\u51fd\u6578\u7c21\u4ecb"},"content":{"rendered":"<h1 id=\"oracle%e5%96%ae%e8%a1%8c%e6%97%a5%e6%9c%9f%e5%87%bd%e6%95%b8%e7%b0%a1%e4%bb%8b-hxSjWVGwug\">Oracle\u55ae\u884c\u65e5\u671f\u51fd\u6578\u7c21\u4ecb<\/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\u65e5\u671f\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u9032\u884c\u65e5\u671f\u548c\u6642\u9593\u7684\u8a08\u7b97\u8207\u683c\u5f0f\u5316\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u5e38\u7528\u7684Oracle\u55ae\u884c\u65e5\u671f\u51fd\u6578\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u7bc4\u4f8b\uff0c\u4ee5\u4fbf\u8b80\u8005\u80fd\u5920\u66f4\u597d\u5730\u7406\u89e3\u548c\u61c9\u7528\u9019\u4e9b\u51fd\u6578\u3002<\/p>\n<h2 id=\"1-sysdate-%e5%87%bd%e6%95%b8-hxSjWVGwug\">1. SYSDATE \u51fd\u6578<\/h2>\n<p>SYSDATE \u51fd\u6578\u7528\u65bc\u8fd4\u56de\u7576\u524d\u7684\u7cfb\u7d71\u65e5\u671f\u548c\u6642\u9593\u3002\u9019\u500b\u51fd\u6578\u4e0d\u9700\u8981\u4efb\u4f55\u53c3\u6578\uff0c\u4e26\u4e14\u8fd4\u56de\u7684\u7d50\u679c\u662f\u65e5\u671f\u578b\u5225\u3002<\/p>\n<pre><code>SELECT SYSDATE FROM dual;<\/code><\/pre>\n<p>\u57f7\u884c\u4e0a\u8ff0\u67e5\u8a62\u5f8c\uff0c\u5c07\u8fd4\u56de\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\uff0c\u4f8b\u5982\uff1a2023-10-01 14:30:00\u3002<\/p>\n<h2 id=\"2-current_date-%e5%87%bd%e6%95%b8-hxSjWVGwug\">2. CURRENT_DATE \u51fd\u6578<\/h2>\n<p>CURRENT_DATE \u51fd\u6578\u8fd4\u56de\u7576\u524d\u6703\u8a71\u7684\u65e5\u671f\u548c\u6642\u9593\uff0c\u4e26\u6839\u64da\u6703\u8a71\u7684\u6642\u5340\u9032\u884c\u8abf\u6574\u3002\u9019\u610f\u5473\u8457\u5982\u679c\u7528\u6236\u5728\u4e0d\u540c\u7684\u6642\u5340\u57f7\u884c\u67e5\u8a62\uff0c\u8fd4\u56de\u7684\u7d50\u679c\u6703\u6709\u6240\u4e0d\u540c\u3002<\/p>\n<pre><code>SELECT CURRENT_DATE FROM dual;<\/code><\/pre>\n<h2 id=\"3-add_months-%e5%87%bd%e6%95%b8-hxSjWVGwug\">3. ADD_MONTHS \u51fd\u6578<\/h2>\n<p>ADD_MONTHS \u51fd\u6578\u7528\u65bc\u5728\u6307\u5b9a\u7684\u65e5\u671f\u4e0a\u589e\u52a0\u6216\u6e1b\u5c11\u6708\u4efd\u3002\u9019\u500b\u51fd\u6578\u63a5\u53d7\u5169\u500b\u53c3\u6578\uff1a\u4e00\u500b\u662f\u65e5\u671f\uff0c\u53e6\u4e00\u500b\u662f\u8981\u589e\u52a0\u7684\u6708\u4efd\u6578\uff08\u53ef\u4ee5\u662f\u8ca0\u6578\uff09\u3002<\/p>\n<pre><code>SELECT ADD_MONTHS(SYSDATE, 3) AS new_date FROM dual;<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8a62\u5c07\u8fd4\u56de\u7576\u524d\u65e5\u671f\u52a0\u4e0a\u4e09\u500b\u6708\u7684\u7d50\u679c\u3002<\/p>\n<h2 id=\"4-months_between-%e5%87%bd%e6%95%b8-hxSjWVGwug\">4. 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\u9019\u500b\u51fd\u6578\u63a5\u53d7\u5169\u500b\u65e5\u671f\u4f5c\u70ba\u53c3\u6578\uff0c\u4e26\u8fd4\u56de\u5b83\u5011\u4e4b\u9593\u7684\u6708\u4efd\u5dee\u3002<\/p>\n<pre><code>SELECT MONTHS_BETWEEN('2023-12-01', '2023-10-01') AS months_diff FROM dual;<\/code><\/pre>\n<p>\u57f7\u884c\u5f8c\u5c07\u8fd4\u56de 2\uff0c\u8868\u793a\u5169\u500b\u65e5\u671f\u4e4b\u9593\u76f8\u5dee\u5169\u500b\u6708\u3002<\/p>\n<h2 id=\"5-last_day-%e5%87%bd%e6%95%b8-hxSjWVGwug\">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\u9019\u5c0d\u65bc\u9700\u8981\u8a08\u7b97\u6708\u5e95\u7684\u60c5\u6cc1\u975e\u5e38\u6709\u7528\u3002<\/p>\n<pre><code>SELECT LAST_DAY(SYSDATE) AS last_day_of_month FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u7576\u524d\u6708\u4efd\u7684\u6700\u5f8c\u4e00\u5929\uff0c\u4f8b\u5982\uff1a2023-10-31\u3002<\/p>\n<h2 id=\"6-trunc-%e5%87%bd%e6%95%b8-hxSjWVGwug\">6. TRUNC \u51fd\u6578<\/h2>\n<p>TRUNC \u51fd\u6578\u7528\u65bc\u5c07\u65e5\u671f\u622a\u65b7\u5230\u6307\u5b9a\u7684\u7cbe\u5ea6\u3002\u9019\u53ef\u4ee5\u7528\u4f86\u53bb\u9664\u6642\u9593\u90e8\u5206\uff0c\u53ea\u4fdd\u7559\u65e5\u671f\u90e8\u5206\u3002<\/p>\n<pre><code>SELECT TRUNC(SYSDATE) AS truncated_date FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u7576\u524d\u65e5\u671f\uff0c\u4f46\u6642\u9593\u90e8\u5206\u5c07\u88ab\u8a2d\u7f6e\u70ba 00:00:00\u3002<\/p>\n<h2 id=\"7-to_char-%e5%87%bd%e6%95%b8-hxSjWVGwug\">7. TO_CHAR \u51fd\u6578<\/h2>\n<p>TO_CHAR \u51fd\u6578\u7528\u65bc\u5c07\u65e5\u671f\u8f49\u63db\u70ba\u5b57\u4e32\u683c\u5f0f\u3002\u9019\u500b\u51fd\u6578\u975e\u5e38\u9748\u6d3b\uff0c\u5141\u8a31\u7528\u6236\u6307\u5b9a\u8f38\u51fa\u7684\u683c\u5f0f\u3002<\/p>\n<pre><code>SELECT TO_CHAR(SYSDATE, 'YYYY-MM-DD HH24:MI:SS') AS formatted_date FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u683c\u5f0f\u5316\u7684\u65e5\u671f\u5b57\u4e32\uff0c\u4f8b\u5982\uff1a2023-10-01 14:30:00\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-hxSjWVGwug\">\u7e3d\u7d50<\/h2>\n<p>Oracle\u8cc7\u6599\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u5f37\u5927\u7684\u55ae\u884c\u65e5\u671f\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5728\u9032\u884c\u8cc7\u6599\u67e5\u8a62\u548c\u5831\u544a\u6642\u66f4\u6709\u6548\u5730\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\u3002\u7121\u8ad6\u662f\u7372\u53d6\u7576\u524d\u65e5\u671f\u3001\u8a08\u7b97\u65e5\u671f\u5dee\u7570\uff0c\u9084\u662f\u683c\u5f0f\u5316\u65e5\u671f\uff0c\u9019\u4e9b\u51fd\u6578\u90fd\u80fd\u63d0\u4f9b\u4fbf\u5229\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u5c0d\u65bc\u9700\u8981\u5728\u9999\u6e2f\u9032\u884c\u8cc7\u6599\u5eab\u7ba1\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u65b9\u6848\u53ef\u4ee5\u9032\u4e00\u6b65\u63d0\u5347\u8cc7\u6599\u8655\u7406\u7684\u6548\u7387\u548c\u9748\u6d3b\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u55ae\u884c\u65e5\u671f\u51fd\u6578\u7684\u57fa\u672c\u7528\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\uff0c\u7c21\u5316\u65e5\u671f\u8655\u7406\u904e\u7a0b\uff0c\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6642\u9593\u6578\u64da\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-95066","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95066","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=95066"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95066\/revisions"}],"predecessor-version":[{"id":95067,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95066\/revisions\/95067"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95066"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95066"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95066"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}