{"id":15436,"date":"2023-12-04T20:08:57","date_gmt":"2023-12-04T12:08:57","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=15436"},"modified":"2023-12-04T20:09:52","modified_gmt":"2023-12-04T12:09:52","slug":"oracle-zhong-jing-chang-shi-yong-dao-de-zi-fu-han","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/oracle-zhong-jing-chang-shi-yong-dao-de-zi-fu-han\/","title":{"rendered":"Oracle \u4e2d\u7ecf\u5e38\u4f7f\u7528\u5230\u7684\u5b57\u7b26\u51fd\u6570\uff1f"},"content":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u6709\u8bb8\u591a\u5b57\u7b26\u51fd\u6570\u53ef\u7528\u4e8e\u5904\u7406\u548c\u64cd\u4f5c\u5b57\u7b26\u4e32\u6570\u636e\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684 Oracle \u5b57\u7b26\u51fd\u6570\uff1a<\/p>\n<ol>\n<li><strong>SUBSTR<\/strong>\uff1a\u7528\u4e8e\u63d0\u53d6\u5b57\u7b26\u4e32\u7684\u5b50\u4e32\u3002\n<pre><code class=\"language-sql  line-numbers\">SELECT SUBSTR('Hello World', 1, 5) FROM DUAL; -- \u8f93\u51fa\uff1aHello\n<\/code><\/pre>\n<\/li>\n<li><strong>CONCAT<\/strong>\uff08\u6216 || \u8fd0\u7b97\u7b26\uff09\uff1a\u7528\u4e8e\u8fde\u63a5\u4e24\u4e2a\u6216\u591a\u4e2a\u5b57\u7b26\u4e32\u3002\n<pre><code class=\"language-sql  line-numbers\">SELECT 'Hello ' || 'World' FROM DUAL; -- \u8f93\u51fa\uff1aHello World\n<\/code><\/pre>\n<\/li>\n<li><strong>UPPER<\/strong> \u548c <strong>LOWER<\/strong>\uff1a\u5206\u522b\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u6216\u5c0f\u5199\u3002\n<pre><code class=\"language-sql  line-numbers\">SELECT UPPER('hello') FROM DUAL; -- \u8f93\u51fa\uff1aHELLO\nSELECT LOWER('WORLD') FROM DUAL; -- \u8f93\u51fa\uff1aworld\n<\/code><\/pre>\n<\/li>\n<li><strong>LENGTH<\/strong>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002\n<pre><code class=\"language-sql  line-numbers\">SELECT LENGTH('Oracle') FROM DUAL; -- \u8f93\u51fa\uff1a6\n<\/code><\/pre>\n<\/li>\n<li><strong>INSTR<\/strong>\uff1a\u8fd4\u56de\u5b50\u5b57\u7b26\u4e32\u5728\u539f\u5b57\u7b26\u4e32\u4e2d\u7684\u4f4d\u7f6e\u3002\n<pre><code class=\"language-sql  line-numbers\">SELECT INSTR('Oracle Database', 'Database') FROM DUAL; -- \u8f93\u51fa\uff1a8\n<\/code><\/pre>\n<\/li>\n<li><strong>TRIM<\/strong>\uff1a\u53bb\u9664\u5b57\u7b26\u4e32\u9996\u5c3e\u7684\u7a7a\u683c\u6216\u6307\u5b9a\u5b57\u7b26\u3002\n<pre><code class=\"language-sql  line-numbers\">SELECT TRIM('   Hello   ') FROM DUAL; -- \u8f93\u51fa\uff1aHello\nSELECT TRIM(',' FROM ',,Oracle,,') FROM DUAL; -- \u8f93\u51fa\uff1aOracle\n<\/code><\/pre>\n<\/li>\n<li><strong>REPLACE<\/strong>\uff1a\u66ff\u6362\u5b57\u7b26\u4e32\u4e2d\u7684\u6307\u5b9a\u5b50\u4e32\u3002\n<pre><code class=\"language-sql  line-numbers\">SELECT REPLACE('Oracle is powerful', 'powerful', 'amazing') FROM DUAL; -- \u8f93\u51fa\uff1aOracle is amazing\n<\/code><\/pre>\n<\/li>\n<\/ol>\n<p>\u8fd9\u4e9b\u5b57\u7b26\u51fd\u6570\u80fd\u591f\u5904\u7406\u5b57\u7b26\u4e32\uff0c\u5bf9\u5176\u8fdb\u884c\u64cd\u4f5c\u3001\u622a\u53d6\u3001\u8fde\u63a5\u3001\u5927\u5c0f\u5199\u8f6c\u6362\u3001\u67e5\u627e\u548c\u66ff\u6362\u7b49\uff0c\u5e2e\u52a9\u8fdb\u884c\u5b57\u7b26\u4e32\u6570\u636e\u7684\u5904\u7406\u548c\u5206\u6790\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u6709\u8bb8\u591a\u5b57\u7b26\u51fd\u6570\u53ef\u7528\u4e8e\u5904\u7406\u548c\u64cd\u4f5c\u5b57\u7b26\u4e32\u6570\u636e\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684 Oracle \u5b57\u7b26\u51fd\u6570\uff1a S [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-15436","post","type-post","status-publish","format-standard","hentry","category-oracel"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15436","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=15436"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15436\/revisions"}],"predecessor-version":[{"id":15437,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15436\/revisions\/15437"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=15436"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=15436"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=15436"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}