{"id":96130,"date":"2024-10-20T06:51:17","date_gmt":"2024-10-19T22:51:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96130\/"},"modified":"2024-10-20T06:51:18","modified_gmt":"2024-10-19T22:51:18","slug":"oracle%e5%b0%8f%e6%95%b8%e9%bb%9e%e4%bf%9d%e7%95%99%e7%9a%84%e5%95%8f%e9%a1%8c%e7%9a%844%e5%80%8b%e8%99%95%e7%90%86%e6%96%b9%e6%a1%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96130\/","title":{"rendered":"Oracle\u5c0f\u6578\u9ede\u4fdd\u7559\u7684\u554f\u984c\u76844\u500b\u8655\u7406\u65b9\u6848"},"content":{"rendered":"<h1 id=\"oracle%e5%b0%8f%e6%95%b8%e9%bb%9e%e4%bf%9d%e7%95%99%e7%9a%84%e5%95%8f%e9%a1%8c%e7%9a%844%e5%80%8b%e8%99%95%e7%90%86%e6%96%b9%e6%a1%88-GuDyzsTlBs\">Oracle\u5c0f\u6578\u9ede\u4fdd\u7559\u7684\u554f\u984c\u76844\u500b\u8655\u7406\u65b9\u6848<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u5b57\u7684\u7cbe\u78ba\u6027\u81f3\u95dc\u91cd\u8981\u3002Oracle\u6578\u64da\u5eab\u5728\u8655\u7406\u5c0f\u6578\u9ede\u6578\u64da\u6642\uff0c\u7d93\u5e38\u6703\u9047\u5230\u5c0f\u6578\u9ede\u4fdd\u7559\u7684\u554f\u984c\u3002\u9019\u4e9b\u554f\u984c\u53ef\u80fd\u5c0e\u81f4\u6578\u64da\u4e0d\u6e96\u78ba\uff0c\u5f71\u97ff\u5831\u544a\u548c\u5206\u6790\u7684\u7d50\u679c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u56db\u7a2e\u8655\u7406Oracle\u5c0f\u6578\u9ede\u4fdd\u7559\u554f\u984c\u7684\u65b9\u6848\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u66f4\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u3002<\/p>\n<h2 id=\"1-%e4%bd%bf%e7%94%a8%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e7%9a%84%e9%81%b8%e6%93%87-GuDyzsTlBs\">1. \u4f7f\u7528\u6578\u64da\u985e\u578b\u7684\u9078\u64c7<\/h2>\n<p>\u5728Oracle\u4e2d\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u662f\u89e3\u6c7a\u5c0f\u6578\u9ede\u4fdd\u7559\u554f\u984c\u7684\u7b2c\u4e00\u6b65\u3002Oracle\u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u64da\u985e\u578b\uff0c\u5982NUMBER\u3001FLOAT\u548cDECIMAL\u7b49\u3002\u9019\u4e9b\u6578\u64da\u985e\u578b\u53ef\u4ee5\u6839\u64da\u9700\u8981\u7684\u7cbe\u5ea6\u548c\u7bc4\u570d\u9032\u884c\u9078\u64c7\u3002<\/p>\n<ul>\n<li><strong>NUMBER(n, m)<\/strong>: \u9019\u500b\u6578\u64da\u985e\u578b\u5141\u8a31\u7528\u6236\u6307\u5b9a\u7e3d\u4f4d\u6578(n)\u548c\u5c0f\u6578\u4f4d\u6578(m)\u3002\u4f8b\u5982\uff0cNUMBER(10, 2)\u8868\u793a\u7e3d\u517110\u4f4d\u6578\uff0c\u5176\u4e2d2\u4f4d\u662f\u5c0f\u6578\u3002<\/li>\n<li><strong>FLOAT<\/strong>: \u9019\u662f\u4e00\u7a2e\u8fd1\u4f3c\u6578\u64da\u985e\u578b\uff0c\u9069\u5408\u8655\u7406\u975e\u5e38\u5927\u7684\u6216\u975e\u5e38\u5c0f\u7684\u6578\u5b57\uff0c\u4f46\u4e0d\u9069\u5408\u9700\u8981\u7cbe\u78ba\u8a08\u7b97\u7684\u5834\u5408\u3002<\/li>\n<li><strong>DECIMAL<\/strong>: \u8207NUMBER\u985e\u4f3c\uff0c\u4f46\u901a\u5e38\u7528\u65bc\u91d1\u878d\u8a08\u7b97\uff0c\u56e0\u70ba\u5b83\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7684\u7cbe\u5ea6\u3002<\/li>\n<\/ul>\n<p>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u53ef\u4ee5\u6709\u6548\u6e1b\u5c11\u5c0f\u6578\u9ede\u4fdd\u7559\u7684\u554f\u984c\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u3002<\/p>\n<h2 id=\"2-%e4%bd%bf%e7%94%a8round%e5%87%bd%e6%95%b8-GuDyzsTlBs\">2. \u4f7f\u7528ROUND\u51fd\u6578<\/h2>\n<p>\u5728\u9032\u884c\u6578\u5b78\u8a08\u7b97\u6642\uff0c\u4f7f\u7528ROUND\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u63a7\u5236\u5c0f\u6578\u9ede\u7684\u4fdd\u7559\u4f4d\u6578\u3002\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u5c07\u6578\u5b57\u56db\u6368\u4e94\u5165\u5230\u6307\u5b9a\u7684\u5c0f\u6578\u4f4d\u6578\u3002<\/p>\n<pre><code>SELECT ROUND(123.4567, 2) AS rounded_value FROM dual;\n<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8a62\u5c07\u8fd4\u56de123.46\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5728\u5831\u544a\u6216\u986f\u793a\u6578\u64da\u6642\uff0c\u6578\u5b57\u7684\u683c\u5f0f\u7b26\u5408\u8981\u6c42\u3002<\/p>\n<h2 id=\"3-%e4%bd%bf%e7%94%a8trunc%e5%87%bd%e6%95%b8-GuDyzsTlBs\">3. \u4f7f\u7528TRUNC\u51fd\u6578<\/h2>\n<p>\u5982\u679c\u9700\u8981\u53bb\u6389\u5c0f\u6578\u90e8\u5206\u800c\u4e0d\u9032\u884c\u56db\u6368\u4e94\u5165\uff0c\u53ef\u4ee5\u4f7f\u7528TRUNC\u51fd\u6578\u3002\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u5c07\u6578\u5b57\u622a\u65b7\u5230\u6307\u5b9a\u7684\u5c0f\u6578\u4f4d\u6578\u3002<\/p>\n<pre><code>SELECT TRUNC(123.4567, 2) AS truncated_value FROM dual;\n<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de123.45\uff0c\u9069\u5408\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u9700\u8981\u7cbe\u78ba\u63a7\u5236\u5c0f\u6578\u4f4d\u6578\u7684\u9700\u6c42\u3002<\/p>\n<h2 id=\"4-%e8%a8%ad%e5%ae%9a%e6%9c%83%e8%a9%b1%e7%9a%84nls%e5%8f%83%e6%95%b8-GuDyzsTlBs\">4. \u8a2d\u5b9a\u6703\u8a71\u7684NLS\u53c3\u6578<\/h2>\n<p>Oracle\u6578\u64da\u5eab\u5141\u8a31\u7528\u6236\u901a\u904e\u8a2d\u7f6eNLS\uff08National Language Support\uff09\u53c3\u6578\u4f86\u63a7\u5236\u6578\u5b57\u7684\u683c\u5f0f\u3002\u9019\u4e9b\u53c3\u6578\u53ef\u4ee5\u5f71\u97ff\u6578\u5b57\u7684\u986f\u793a\u65b9\u5f0f\uff0c\u5305\u62ec\u5c0f\u6578\u9ede\u7684\u4fdd\u7559\u3002<\/p>\n<pre><code>ALTER SESSION SET NLS_NUMERIC_CHARACTERS = ', ';\n<\/code><\/pre>\n<p>\u9019\u689d\u547d\u4ee4\u5c07\u5c0f\u6578\u9ede\u7b26\u865f\u8a2d\u7f6e\u70ba\u9017\u865f\uff0c\u9019\u5728\u67d0\u4e9b\u5730\u5340\u7684\u6578\u64da\u986f\u793a\u4e2d\u662f\u5e38\u898b\u7684\u505a\u6cd5\u3002\u901a\u904e\u8abf\u6574\u9019\u4e9b\u53c3\u6578\uff0c\u53ef\u4ee5\u66f4\u597d\u5730\u6eff\u8db3\u7279\u5b9a\u696d\u52d9\u9700\u6c42\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-GuDyzsTlBs\">\u7e3d\u7d50<\/h2>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u5c0f\u6578\u9ede\u4fdd\u7559\u554f\u984c\u662f\u4e00\u500b\u5e38\u898b\u7684\u6311\u6230\uff0c\u4f46\u901a\u904e\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u3001\u4f7f\u7528ROUND\u548cTRUNC\u51fd\u6578\u4ee5\u53ca\u8a2d\u7f6eNLS\u53c3\u6578\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\u3002\u9019\u4e9b\u65b9\u6cd5\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\uff0c\u9084\u80fd\u589e\u5f37\u5831\u544a\u548c\u5206\u6790\u7684\u53ef\u9760\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u4f86\u7ba1\u7406\u60a8\u7684\u6578\u64da\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u6578\u64da\u5eab\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\uff0c\u78ba\u4fdd\u60a8\u7684\u696d\u52d9\u904b\u884c\u9806\u5229\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u5c0f\u6578\u9ede\u4fdd\u7559\u554f\u984c\u7684\u56db\u7a2e\u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u6709\u6548\u7ba1\u7406\u6578\u64da\u7cbe\u5ea6\u8207\u8a08\u7b97\u6e96\u78ba\u6027\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-96130","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96130","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=96130"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96130\/revisions"}],"predecessor-version":[{"id":96131,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96130\/revisions\/96131"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96130"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96130"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96130"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}