{"id":94424,"date":"2024-10-19T19:09:23","date_gmt":"2024-10-19T11:09:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94424\/"},"modified":"2024-10-19T19:09:24","modified_gmt":"2024-10-19T11:09:24","slug":"oracle-substr%e5%ad%97%e7%ac%a6%e6%88%aa%e5%8f%96%e5%87%bd%e6%95%b8%e5%af%a6%e6%93%8d","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94424\/","title":{"rendered":"Oracle Substr\u5b57\u7b26\u622a\u53d6\u51fd\u6578\u5be6\u64cd"},"content":{"rendered":"<h1 id=\"oracle-substr%e5%ad%97%e7%ac%a6%e6%88%aa%e5%8f%96%e5%87%bd%e6%95%b8%e5%af%a6%e6%93%8d-nTVvQEPLdN\">Oracle Substr\u5b57\u7b26\u622a\u53d6\u51fd\u6578\u5be6\u64cd<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u5b57\u7b26\u8655\u7406\u662f\u4e00\u9805\u5e38\u898b\u7684\u9700\u6c42\u3002Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u4f86\u8655\u7406\u5b57\u7b26\u4e32\uff0c\u5176\u4e2d\u6700\u5e38\u7528\u7684\u51fd\u6578\u4e4b\u4e00\u4fbf\u662f<code>SUBSTR<\/code>\u51fd\u6578\u3002\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u622a\u53d6\u5b57\u7b26\u4e32\u7684\u7279\u5b9a\u90e8\u5206\uff0c\u5c0d\u65bc\u6578\u64da\u6e05\u7406\u548c\u683c\u5f0f\u5316\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h2 id=\"substr%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-nTVvQEPLdN\">SUBSTR\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>Oracle\u7684<code>SUBSTR<\/code>\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SUBSTR(string, start_position, [length])<\/code><\/pre>\n<ul>\n<li><strong>string<\/strong>\uff1a\u8981\u9032\u884c\u622a\u53d6\u7684\u539f\u59cb\u5b57\u7b26\u4e32\u3002<\/li>\n<li><strong>start_position<\/strong>\uff1a\u622a\u53d6\u7684\u8d77\u59cb\u4f4d\u7f6e\uff0c\u5f9e1\u958b\u59cb\u8a08\u7b97\u3002\u5982\u679c\u70ba\u8ca0\u6578\uff0c\u5247\u5f9e\u5b57\u7b26\u4e32\u7684\u672b\u5c3e\u958b\u59cb\u8a08\u7b97\u3002<\/li>\n<li><strong>length<\/strong>\uff08\u53ef\u9078\uff09\uff1a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u6578\u3002\u5982\u679c\u7701\u7565\uff0c\u5247\u5f9e\u8d77\u59cb\u4f4d\u7f6e\u5230\u5b57\u7b26\u4e32\u7684\u7d50\u5c3e\u90fd\u6703\u88ab\u622a\u53d6\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-nTVvQEPLdN\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528<code>SUBSTR<\/code>\u51fd\u6578\u7684\u5be6\u969b\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b1%ef%bc%9a%e5%9f%ba%e6%9c%ac%e6%88%aa%e5%8f%96-nTVvQEPLdN\">\u7bc4\u4f8b1\uff1a\u57fa\u672c\u622a\u53d6<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u5b57\u7b26\u4e32\u300cHello, World!\u300d\uff0c\u6211\u5011\u60f3\u8981\u622a\u53d6\u300cHello\u300d\u9019\u90e8\u5206\uff1a<\/p>\n<pre><code>SELECT SUBSTR('Hello, World!', 1, 5) AS result FROM dual;<\/code><\/pre>\n<p>\u57f7\u884c\u4e0a\u8ff0\u67e5\u8a62\u5f8c\uff0c\u7d50\u679c\u5c07\u662f\u300cHello\u300d\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b2%ef%bc%9a%e5%be%9e%e6%9c%ab%e5%b0%be%e9%96%8b%e5%a7%8b%e6%88%aa%e5%8f%96-nTVvQEPLdN\">\u7bc4\u4f8b2\uff1a\u5f9e\u672b\u5c3e\u958b\u59cb\u622a\u53d6<\/h3>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u5f9e\u5b57\u7b26\u4e32\u7684\u672b\u5c3e\u958b\u59cb\u622a\u53d6\uff0c\u53ef\u4ee5\u4f7f\u7528\u8ca0\u6578\u4f5c\u70ba\u8d77\u59cb\u4f4d\u7f6e\u3002\u4f8b\u5982\uff0c\u5f9e\u300cHello, World!\u300d\u4e2d\u622a\u53d6\u300cWorld!\u300d\uff1a<\/p>\n<pre><code>SELECT SUBSTR('Hello, World!', -6) AS result FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u300cWorld!\u300d\uff0c\u56e0\u70ba\u6211\u5011\u5f9e\u5012\u6578\u7b2c\u516d\u500b\u5b57\u7b26\u958b\u59cb\u622a\u53d6\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b3%ef%bc%9a%e7%9c%81%e7%95%a5%e9%95%b7%e5%ba%a6%e5%8f%83%e6%95%b8-nTVvQEPLdN\">\u7bc4\u4f8b3\uff1a\u7701\u7565\u9577\u5ea6\u53c3\u6578<\/h3>\n<p>\u5982\u679c\u7701\u7565\u9577\u5ea6\u53c3\u6578\uff0c\u5247\u6703\u5f9e\u8d77\u59cb\u4f4d\u7f6e\u622a\u53d6\u5230\u5b57\u7b26\u4e32\u7684\u7d50\u5c3e\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT SUBSTR('Hello, World!', 8) AS result FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u300cWorld!\u300d\uff0c\u56e0\u70ba\u6211\u5011\u5f9e\u7b2c\u516b\u500b\u5b57\u7b26\u958b\u59cb\u622a\u53d6\uff0c\u76f4\u5230\u5b57\u7b26\u4e32\u7684\u7d50\u5c3e\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-nTVvQEPLdN\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528<code>SUBSTR<\/code>\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5982\u679c<code>start_position<\/code>\u8d85\u904e\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\uff0c\u5247\u8fd4\u56de\u7a7a\u5b57\u7b26\u4e32\u3002<\/li>\n<li>\u5982\u679c<code>length<\/code>\u8d85\u904e\u5269\u9918\u5b57\u7b26\u7684\u6578\u91cf\uff0c\u5247\u53ea\u6703\u8fd4\u56de\u5f9e<code>start_position<\/code>\u958b\u59cb\u5230\u5b57\u7b26\u4e32\u7d50\u5c3e\u7684\u90e8\u5206\u3002<\/li>\n<li>\u5c0d\u65bc\u591a\u5b57\u7bc0\u5b57\u7b26\uff08\u5982\u4e2d\u6587\uff09\uff0c<code>SUBSTR<\/code>\u51fd\u6578\u7684\u884c\u70ba\u53ef\u80fd\u6703\u6709\u6240\u4e0d\u540c\uff0c\u9700\u7279\u5225\u6ce8\u610f\u5b57\u7b26\u7684\u7de8\u78bc\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-nTVvQEPLdN\">\u7d50\u8ad6<\/h2>\n<p>Oracle\u7684<code>SUBSTR<\/code>\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u8655\u7406\u548c\u622a\u53d6\u5b57\u7b26\u4e32\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u6e05\u7406\u3001\u5831\u544a\u751f\u6210\u9084\u662f\u5176\u4ed6\u6578\u64da\u8655\u7406\u4efb\u52d9\u4e2d\uff0c\u638c\u63e1\u9019\u500b\u51fd\u6578\u90fd\u80fd\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u76f8\u95dc\u6280\u8853\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\uff0c\u7279\u5225\u662f\u6709\u95dc\u65bc<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u548c<code><a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a><\/code>\u7684\u5167\u5bb9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2Oracle Substr\u51fd\u6578\u7684\u5be6\u64cd\u6280\u5de7\uff0c\u638c\u63e1\u5b57\u7b26\u622a\u53d6\u65b9\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u7c21\u5316\u67e5\u8a62\u64cd\u4f5c\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-94424","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94424","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=94424"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94424\/revisions"}],"predecessor-version":[{"id":94425,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94424\/revisions\/94425"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94424"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94424"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94424"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}