{"id":41723,"date":"2023-05-22T03:07:02","date_gmt":"2023-10-26T19:19:05","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90postgresql%e3%80%91%e5%85%b3%e4%ba%8e%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b0\/"},"modified":"2024-04-30T05:20:36","modified_gmt":"2024-04-29T21:20:36","slug":"%e3%80%90postgresql%e3%80%91%e5%85%b3%e4%ba%8e%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90postgresql%e3%80%91%e5%85%b3%e4%ba%8e%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b0\/","title":{"rendered":"\u3010PostgreSQL\u3011\u5173\u4e8e\u5b57\u7b26\u4e32\u51fd\u6570"},"content":{"rendered":"<h1>\u3010PostgreSQL\u3011\u5173\u4e8e\u5b57\u7b26\u4e32\u51fd\u6570\u7684\u4ecb\u7ecd<\/h1>\n<h2>\u6587\u5b57\u5217\u51fd\u6570\u662f\u4ec0\u4e48\uff1f<\/h2>\n<p>\u6587\u5b57\u5217\u51fd\u6570\u662f\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5904\u7406\u5e76\u8fd4\u56de\u7ed3\u679c\u7684\u51fd\u6570\u3002<\/p>\n<div>\n<div class=\"post-table\">\u95a2\u6570\u8aac\u660elower(\u6587\u5b57\u5217)\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217\u3092\u5c0f\u6587\u5b57\u306b\u5909\u63db\u3057\u3066\u8fd4\u3059upper(\u6587\u5b57\u5217)\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217\u3092\u5927\u6587\u5b57\u306b\u5909\u63db\u3057\u3066\u8fd4\u3059char_length(\u6587\u5b57\u5217)\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217\u306e\u6587\u5b57\u6570\u3092\u8fd4\u3059octet_length(\u6587\u5b57\u5217)\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217\u306e\u30d0\u30a4\u30c8\u6570\u3092\u8fd4\u3059trim(\u5143\u6587\u5b57\u5217[, \u9664\u53bb\u3059\u308b\u6587\u5b57\u5217])\u6307\u5b9a\u3057\u305f\u5143\u6587\u5b57\u5217\u304b\u3089\u9664\u53bb\u3059\u308b\u6587\u5b57\u5217\u3092\u53d6\u308a\u9664\u3044\u3066\u8fd4\u3059<br 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\u8ffd\u52a0\u3059\u308b\u6587\u5b57\u5217])\u6307\u5b9a\u3057\u305f\u5143\u6587\u5b57\u5217\u306e\u672b\u5c3e\u306b\u3001\u6587\u5b57\u6570\u306b\u9054\u3059\u308b\u307e\u3067\u8ffd\u52a0\u3059\u308b\u6587\u5b57\u5217\u304c\u57cb\u3081\u8fbc\u307e\u308c\u308b<br \/>\n\u8ffd\u52a0\u3059\u308b\u6587\u5b57\u5217\u3092\u7701\u7565\u3057\u305f\u5834\u5408\u306f\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u7a7a\u767d\u6587\u5b57\u304c\u8a2d\u5b9a\u3055\u308c\u308bsubstring(\u6587\u5b57\u5217, \u958b\u59cb\u4f4d\u7f6e[, \u6587\u5b57\u6570])\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217\u306e\u958b\u59cb\u4f4d\u7f6e\u304b\u3089\u3001\u6587\u5b57\u6570\u5206\u306e\u6587\u5b57\u5217\u3092\u53d6\u5f97\u3057\u3066\u8fd4\u3059<br \/>\n\u6587\u5b57\u6570\u3092\u7701\u7565\u3057\u305f\u5834\u5408\u306f\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u672b\u5c3e\u307e\u3067\u306b\u8a2d\u5b9a\u3055\u308c\u308breplace(\u6587\u5b57\u5217, \u7f6e\u63db\u524d\u306e\u6587\u5b57\u5217, \u7f6e\u63db\u5f8c\u306e\u6587\u5b57\u5217)\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217\u4e2d\u306e\u7f6e\u63db\u524d\u306e\u6587\u5b57\u5217\u3092\u3001\u7f6e\u63db\u5f8c\u306e\u6587\u5b57\u5217\u306b\u7f6e\u304d\u63db\u3048\u3066\u8fd4\u3059<\/div>\n<\/div>\n<h4>\u7528\u6cd5 f\u01ce)<\/h4>\n<h5>\u4f4e<\/h5>\n<pre class=\"post-pre\"><code><span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">SELECT<\/span> <span class=\"k\">lower<\/span><span class=\"p\">(<\/span><span class=\"s1\">'TOM'<\/span><span class=\"p\">);<\/span>\r\n <span class=\"k\">lower<\/span> \r\n<span class=\"c1\">-------<\/span>\r\n <span class=\"n\">tom<\/span>\r\n<span class=\"p\">(<\/span><span class=\"mi\">1<\/span> <span class=\"err\">\u884c<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<h5>\u4e0a\u65b9<\/h5>\n<pre class=\"post-pre\"><code><span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">SELECT<\/span> <span class=\"k\">upper<\/span><span class=\"p\">(<\/span><span class=\"s1\">'tom'<\/span><span class=\"p\">);<\/span>\r\n <span class=\"k\">upper<\/span> \r\n<span class=\"c1\">-------<\/span>\r\n <span class=\"n\">TOM<\/span>\r\n<span class=\"p\">(<\/span><span class=\"mi\">1<\/span> <span class=\"err\">\u884c<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<h5>\u5b57\u7b26\u957f\u5ea6<\/h5>\n<pre class=\"post-pre\"><code><span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">SELECT<\/span> <span class=\"k\">char_length<\/span><span class=\"p\">(<\/span><span class=\"s1\">'postgresql'<\/span><span class=\"p\">);<\/span>\r\n <span class=\"k\">char_length<\/span> \r\n<span class=\"c1\">-------------<\/span>\r\n          <span class=\"mi\">10<\/span>\r\n<span class=\"p\">(<\/span><span class=\"mi\">1<\/span> <span class=\"err\">\u884c<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<h5>\u516b\u5b57\u8282\u957f\u5ea6<\/h5>\n<pre class=\"post-pre\"><code><span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">SELECT<\/span> <span class=\"k\">octet_length<\/span><span class=\"p\">(<\/span><span class=\"s1\">'ab c'<\/span><span class=\"p\">);<\/span>\r\n <span class=\"k\">octet_length<\/span> \r\n<span class=\"c1\">--------------<\/span>\r\n            <span class=\"mi\">4<\/span>\r\n<span class=\"p\">(<\/span><span class=\"mi\">1<\/span> <span class=\"err\">\u884c<\/span><span class=\"p\">)<\/span>\r\n\r\n<\/code><\/pre>\n<h5>\u4fee\u526a\uff08\uff09<\/h5>\n<pre class=\"post-pre\"><code><span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">SELECT<\/span> <span class=\"k\">trim<\/span><span class=\"p\">(<\/span><span class=\"s1\">'yxTomxx'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'xyz'<\/span><span class=\"p\">);<\/span>\r\n <span class=\"n\">btrim<\/span> \r\n<span class=\"c1\">-------<\/span>\r\n <span class=\"n\">Tom<\/span>\r\n<span class=\"p\">(<\/span><span class=\"mi\">1<\/span> <span class=\"err\">\u884c<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<h5>\u586b\u5145<\/h5>\n<pre class=\"post-pre\"><code><span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">SELECT<\/span> <span class=\"n\">lpad<\/span><span class=\"p\">(<\/span><span class=\"s1\">'hi'<\/span><span class=\"p\">,<\/span> <span class=\"mi\">5<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'xy'<\/span><span class=\"p\">);<\/span>\r\n <span class=\"n\">lpad<\/span>  \r\n<span class=\"c1\">-------<\/span>\r\n <span class=\"n\">xyxhi<\/span>\r\n<span class=\"p\">(<\/span><span class=\"mi\">1<\/span> <span class=\"err\">\u884c<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<h5>\u586b\u5145<\/h5>\n<pre class=\"post-pre\"><code><span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">SELECT<\/span> <span class=\"n\">rpad<\/span><span class=\"p\">(<\/span><span class=\"s1\">'hi'<\/span><span class=\"p\">,<\/span> <span class=\"mi\">5<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'xy'<\/span><span class=\"p\">);<\/span>\r\n <span class=\"n\">rpad<\/span>  \r\n<span class=\"c1\">-------<\/span>\r\n <span class=\"n\">hixyx<\/span>\r\n<span class=\"p\">(<\/span><span class=\"mi\">1<\/span> <span class=\"err\">\u884c<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<h5>\u622a\u53d6<\/h5>\n<pre class=\"post-pre\"><code><span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">SELECT<\/span> <span class=\"k\">substring<\/span><span class=\"p\">(<\/span><span class=\"s1\">'Thomas'<\/span><span class=\"p\">,<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"mi\">3<\/span><span class=\"p\">);<\/span>\r\n <span class=\"k\">substring<\/span> \r\n<span class=\"c1\">-----------<\/span>\r\n <span class=\"n\">hom<\/span>\r\n<span class=\"p\">(<\/span><span class=\"mi\">1<\/span> <span class=\"err\">\u884c<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">SELECT<\/span> <span class=\"k\">substring<\/span><span class=\"p\">(<\/span><span class=\"s1\">'Thomas'<\/span><span class=\"p\">,<\/span> <span class=\"mi\">3<\/span><span class=\"p\">);<\/span>\r\n <span class=\"k\">substring<\/span> \r\n<span class=\"c1\">-----------<\/span>\r\n <span class=\"n\">omas<\/span>\r\n<span class=\"p\">(<\/span><span class=\"mi\">1<\/span> <span class=\"err\">\u884c<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<h5>\u8bf7\u7528\u6c49\u8bed\u7cbe\u786e\u5730\u66ff\u6362\u4ee5\u4e0b\u5185\u5bb9\uff0c\u53ea\u9700\u8981\u4e00\u79cd\u9009\u9879:<\/h5>\n<pre class=\"post-pre\"><code><span class=\"n\">postgres<\/span><span class=\"o\">=#<\/span> <span class=\"k\">SELECT<\/span> <span class=\"k\">replace<\/span><span class=\"p\">(<\/span><span class=\"s1\">'abcdefabcdef'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'cd'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'XX'<\/span><span class=\"p\">);<\/span>\r\n   <span class=\"k\">replace<\/span>    \r\n<span class=\"c1\">--------------<\/span>\r\n <span class=\"n\">abXXefabXXef<\/span>\r\n<span class=\"p\">(<\/span><span class=\"mi\">1<\/span> <span class=\"err\">\u884c<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u3010PostgreSQL\u3011\u5173\u4e8e\u5b57\u7b26\u4e32\u51fd\u6570\u7684\u4ecb\u7ecd \u6587\u5b57\u5217\u51fd\u6570\u662f\u4ec0\u4e48\uff1f \u6587\u5b57\u5217\u51fd\u6570\u662f\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5904\u7406\u5e76\u8fd4\u56de\u7ed3\u679c\u7684\u51fd\u6570 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-41723","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010PostgreSQL\u3011\u5173\u4e8e\u5b57\u7b26\u4e32\u51fd\u6570 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010postgresql\u3011\u5173\u4e8e\u5b57\u7b26\u4e32\u51fd\u6570\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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