{"id":42219,"date":"2022-11-16T02:51:35","date_gmt":"2022-11-06T09:14:39","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%b0%86%e6%95%b0%e6%8d%ae%e4%bb%8eoracle%e8%bf%81%e7%a7%bb%e5%88%b0postgresql%e6%97%b6%e9%9c%80%e8%a6%81%e8%bf%9b%e8%a1%8csql%e8%af%ad%e5%8f%a5%e7%9a%84%e4%bf%ae%e6%94%b9%e3%80%82\/"},"modified":"2024-04-29T00:52:23","modified_gmt":"2024-04-28T16:52:23","slug":"%e5%b0%86%e6%95%b0%e6%8d%ae%e4%bb%8eoracle%e8%bf%81%e7%a7%bb%e5%88%b0postgresql%e6%97%b6%e9%9c%80%e8%a6%81%e8%bf%9b%e8%a1%8csql%e8%af%ad%e5%8f%a5%e7%9a%84%e4%bf%ae%e6%94%b9%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%b0%86%e6%95%b0%e6%8d%ae%e4%bb%8eoracle%e8%bf%81%e7%a7%bb%e5%88%b0postgresql%e6%97%b6%e9%9c%80%e8%a6%81%e8%bf%9b%e8%a1%8csql%e8%af%ad%e5%8f%a5%e7%9a%84%e4%bf%ae%e6%94%b9%e3%80%82\/","title":{"rendered":"\u5c06\u6570\u636e\u4eceOracle\u8fc1\u79fb\u5230PostgreSQL\u65f6\u9700\u8981\u8fdb\u884cSQL\u8bed\u53e5\u7684\u4fee\u6539"},"content":{"rendered":"<p>\u5728\u4eceOracle\u8fc1\u79fb\u5230PostgreSQL\u7684\u8fc7\u7a0b\u4e2d\uff0c\u9700\u8981\u91cd\u65b0\u7f16\u5199SQL\u8bed\u53e5\u3002<br \/>\n\u4e0b\u9762\u5217\u4e3e\u4e86\u4e00\u4e9b\u5728\u91cd\u65b0\u7f16\u5199\u65f6\u51fa\u73b0\u7684\u9519\u8bef\u4ee5\u53ca\u4fee\u6539\u7684\u51fd\u6570\u3002<\/p>\n<h3>\u9519\u8bef\uff1aFROM\u5b50\u67e5\u8be2\u5fc5\u987b\u6709\u4e00\u4e2a\u522b\u540d\u3002<\/h3>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"k\">SELECT<\/span> <span class=\"mi\">1<\/span>\r\n<span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u5728PostgreSQL\u4e2d\uff0c\u5982\u679c\u4e0d\u7ed9\u526f\u67e5\u8be2\u53d6\u522b\u540d\uff0c\u5c06\u4f1a\u4ea7\u751f\u9519\u8bef\u3002\u56e0\u6b64\uff0c\u8bf7\u7ed9\u526f\u67e5\u8be2\u53d6\u4e00\u4e2a\u522b\u540d\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"o\">*<\/span> <span class=\"k\">FROM<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"k\">SELECT<\/span> <span class=\"mi\">1<\/span>\r\n<span class=\"p\">)<\/span> <span class=\"n\">sub<\/span>\r\n<\/code><\/pre>\n<h3>\u89e3\u7801\u51fd\u6570<\/h3>\n<p>\u7531\u4e8ePostgreSQL\u4e2d\u6ca1\u6709\u89e3\u5bc6\u529f\u80fd\uff0c\u6240\u4ee5\u6211\u5c06\u5176\u6539\u5199\u4e3aCASE\u8bed\u53e5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">DECODE<\/span><span class=\"p\">(<\/span><span class=\"s1\">'\u5224\u5b9a\u3059\u308b\u5024'<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'1\u306e\u5834\u5408'<\/span><span class=\"p\">,<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'2\u306e\u5834\u5408'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408'<\/span><span class=\"p\">)<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">DUAL<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"k\">CASE<\/span> <span class=\"s1\">'\u5224\u5b9a\u3059\u308b\u5024'<\/span>\r\n    <span class=\"k\">WHEN<\/span> <span class=\"mi\">1<\/span> <span class=\"k\">THEN<\/span> <span class=\"s1\">'1\u306e\u5834\u5408'<\/span>\r\n    <span class=\"k\">WHEN<\/span> <span class=\"mi\">2<\/span> <span class=\"k\">THEN<\/span> <span class=\"s1\">'2\u306e\u5834\u5408'<\/span>\r\n    <span class=\"k\">ELSE<\/span> <span class=\"s1\">'\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408'<\/span>\r\n    <span class=\"k\">END<\/span>\r\n<\/code><\/pre>\n<h3>NVL \u51fd\u6570<\/h3>\n<p>\u7531\u4e8eNVL\u51fd\u6570\u4e0d\u53ef\u7528\uff0c\u5c06\u5176\u66f4\u6539\u4e3aCOALESCE\u51fd\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">NVL<\/span><span class=\"p\">(<\/span><span class=\"s1\">'null\u5224\u5b9a\u3059\u308b\u5024'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'null\u3060\u3063\u305f\u5834\u5408\u306e\u5024'<\/span><span class=\"p\">)<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">DUAL<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">COALESCE<\/span><span class=\"p\">(<\/span><span class=\"s1\">'null\u5224\u5b9a\u3059\u308b\u5024'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'null\u3060\u3063\u305f\u5834\u5408\u306e\u5024'<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<h3>GREATEST\u51fd\u6570\u548cLEAST\u51fd\u6570\u7684\u884c\u4e3a\u5dee\u5f02<\/h3>\n<p>\u5982\u679c\u5217\u8868\u4e2d\u6709null\uff0cOracle\u4f1a\u8fd4\u56denull\uff0c\u800cPostgreSQL\u4f1a\u5ffd\u7565null\u5e76\u8fd4\u56deLEAST\u4e2d\u7684\u6700\u5c0f\u503c1\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">LEAST<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"k\">null<\/span><span class=\"p\">)<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">DUAL<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">LEAST<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"k\">null<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u6839\u636e\u5217\u8868\u4e2d\u662f\u5426\u53ef\u80fd\u5305\u542b\u7a7a\u503c\u6765\u6539\u5199SQL\u3002<\/p>\n<h3>\u83b7\u53d6\u5e8f\u5217<\/h3>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"err\">\u30b7\u30fc\u30b1\u30f3\u30b9\u540d<\/span><span class=\"p\">.<\/span><span class=\"n\">NEXTVAL<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">DUAL<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">NEXTVAL<\/span><span class=\"p\">(<\/span><span class=\"s1\">'\u30b7\u30fc\u30b1\u30f3\u30b9\u540d'<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u9664\u6b64\u4e4b\u5916\u8fd8\u6709\u4e00\u4e9b\u9009\u9879\uff0c\u6211\u6311\u9009\u4e86\u51e0\u4e2a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u4eceOracle\u8fc1\u79fb\u5230PostgreSQL\u7684\u8fc7\u7a0b\u4e2d\uff0c\u9700\u8981\u91cd\u65b0\u7f16\u5199SQL\u8bed\u53e5\u3002 \u4e0b\u9762\u5217\u4e3e\u4e86\u4e00\u4e9b\u5728\u91cd\u65b0\u7f16\u5199\u65f6\u51fa\u73b0\u7684 [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-42219","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\/ 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