{"id":365,"date":"2023-09-16T10:44:50","date_gmt":"2023-09-16T02:44:50","guid":{"rendered":""},"modified":"2023-09-18T11:50:02","modified_gmt":"2023-09-18T03:50:02","slug":"sql%e4%b8%ad%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%88%aa%e5%8f%96%e5%87%bd%e6%95%b0left%e3%80%81substring","status":"publish","type":"post","link":"https:\/\/mushiming.com\/365.html","title":{"rendered":"SQL\u4e2d\u5b57\u7b26\u4e32\u622a\u53d6\u51fd\u6570(left\u3001SUBSTRING)"},"content":{"rendered":"<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"display: none;\"> \n <path stroke-linecap=\"round\" d=\"M5,0 0,2.5 5,5z\" id=\"raphael-marker-block\" style=\"-webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"><\/path> \n<\/svg> <\/p>\n<div align=\"center\">\n<\/div>\n<ul>\n<li>\ud83d\udcda\u516c\u4f17\u53f7\uff1aPython\u56fe\u4e66\u9986 (ID:python_library)<\/li>\n<li>\u6574\u7406\uff1a\ud83d\udcbb\u5146\u950b<\/li>\n<\/ul>\n<blockquote>\n<p>\u73af\u5883\u914d\u7f6e\uff1asqlserver2008<\/p>\n<\/blockquote>\n<ul>\n<li>left\uff08name,4\uff09\u622a\u53d6\u5de6\u8fb9\u76844\u4e2a\u5b57\u7b26<\/li>\n<\/ul>\n<pre><code class=\"prism language-sql\">\u5217\uff1a<span class=\"token keyword\">SELECT<\/span> <span class=\"token keyword\">LEFT<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">201809<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span> \u5e74\n\u7ed3\u679c\uff1a<span class=\"token number\">2018<\/span>\n<\/code><\/pre>\n<ul>\n<li>right\uff08name,2\uff09\u622a\u53d6\u53f3\u8fb9\u76842\u4e2a\u5b57\u7b26<\/li>\n<\/ul>\n<pre><code class=\"prism language-sql\"><span class=\"token keyword\">SELECT<\/span> <span class=\"token keyword\">RIGHT<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">201809<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> \u6708\u4efd\n\u7ed3\u679c\uff1a<span class=\"token number\">09<\/span>\n<\/code><\/pre>\n<ul>\n<li>SUBSTRING(name,5,3) \u622a\u53d6name\u8fd9\u4e2a\u5b57\u6bb5 \u4ece\u7b2c\u4e94\u4e2a\u5b57\u7b26\u5f00\u59cb \u53ea\u622a\u53d6\u4e4b\u540e\u76843\u4e2a\u5b57\u7b26<\/li>\n<\/ul>\n<pre><code class=\"prism language-sql\"><span class=\"token keyword\">SELECT<\/span> SUBSTRING<span class=\"token punctuation\">(<\/span><span class=\"token string\">'\u6210\u90fd\u878d\u8d44\u4e8b\u4e1a\u90e8'<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span>\n\u7ed3\u679c\uff1a\u4e8b\u4e1a\u90e8\n<\/code><\/pre>\n<p>\u70ed \u6587 \u63a8 \u8350<\/p>\n<ul>\n<li>\ud83d\udcc8\u5546\u4e1a\u6570\u636e\u5206\u6790\u5165\u95e8\u6559\u7a0b<\/li>\n<li>\u63a8\u83505\u4e2aExcel\u81ea\u52a8\u5316\u529e\u516c\u514d\u8d39\u5b66\u4e60\u8d44\u6e90~\uff08\u6570\u636e\u5206\u6790\u3001Python\u3001VBA\u7b49\uff09\u5168\u89e3\u6790\uff01<\/li>\n<li>9\u4e2a\u5904\u7406Excel\u7684Python\u5e93\uff0c\u5230\u5e95\u54ea\u4e2a\u6700\u597d\u7528\uff1f<\/li>\n<li>\ud83d\udd2547\u9875PPT\uff1a\u5982\u4f55\u5229\u7528Python\u8fdb\u884c\u81ea\u52a8\u5316\u529e\u516c\uff1f<\/li>\n<li>Python\u5fc5\u8bfb\u597d\u4e66\uff0c\u8fd99\u672c\u4efd\u91cf\u5341\u8db3~<\/li>\n<li>\u5982\u4f55\u7528Python\u5904\u7406Excel\uff1fPandas\u89c6\u9891\u6559\u7a0b&\u5b98\u65b9\u6587\u6863\u6765\u5566~<\/li>\n<li>\ud83d\ude80\u5185\u5e55 | 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