{"id":154557,"date":"2024-11-02T16:48:39","date_gmt":"2024-11-02T08:48:39","guid":{"rendered":"https:\/\/server.hk\/cnblog\/154557\/"},"modified":"2024-11-02T16:48:40","modified_gmt":"2024-11-02T08:48:40","slug":"%e5%b0%8d-oracle-sql-%e5%88%b0-db2-sql-%e7%a7%bb%e6%a4%8d%e7%9a%84%e6%b7%ba%e6%9e%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/154557\/","title":{"rendered":"\u5c0d Oracle SQL \u5230 DB2 SQL \u79fb\u690d\u7684\u6dfa\u6790"},"content":{"rendered":"<h1 id=\"%e5%b0%8d-oracle-sql-%e5%88%b0-db2-sql-%e7%a7%bb%e6%a4%8d%e7%9a%84%e6%b7%ba%e6%9e%90-bqGCuaBGaR\">\u5c0d Oracle SQL \u5230 DB2 SQL \u79fb\u690d\u7684\u6dfa\u6790<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u7ba1\u7406\u74b0\u5883\u4e2d\uff0c\u4f01\u696d\u7d93\u5e38\u9700\u8981\u5728\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u4e4b\u9593\u9032\u884c\u9077\u79fb\u3002Oracle SQL \u548c DB2 SQL \u662f\u5169\u7a2e\u5ee3\u6cdb\u4f7f\u7528\u7684\u6578\u64da\u5eab\u8a9e\u8a00\uff0c\u5404\u81ea\u64c1\u6709\u7368\u7279\u7684\u7279\u6027\u548c\u529f\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5f9e Oracle SQL \u79fb\u690d\u5230 DB2 SQL \u7684\u904e\u7a0b\uff0c\u4e26\u5206\u6790\u5176\u4e2d\u7684\u6311\u6230\u8207\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"oracle-sql-%e8%88%87-db2-sql-%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-bqGCuaBGaR\">Oracle SQL \u8207 DB2 SQL \u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>Oracle SQL \u662f\u7531\u7532\u9aa8\u6587\u516c\u53f8\u958b\u767c\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08RDBMS\uff09\uff0c\u4ee5\u5176\u5f37\u5927\u7684\u6027\u80fd\u548c\u53ef\u64f4\u5c55\u6027\u800c\u805e\u540d\u3002DB2 \u5247\u662f IBM \u958b\u767c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u7279\u5225\u9069\u5408\u5927\u578b\u4f01\u696d\u7684\u6578\u64da\u8655\u7406\u9700\u6c42\u3002\u96d6\u7136\u5169\u8005\u90fd\u9075\u5faa SQL \u6a19\u6e96\uff0c\u4f46\u5728\u8a9e\u6cd5\u3001\u6578\u64da\u985e\u578b\u548c\u529f\u80fd\u4e0a\u5b58\u5728\u4e00\u4e9b\u5dee\u7570\u3002<\/p>\n<h2 id=\"%e7%a7%bb%e6%a4%8d%e9%81%8e%e7%a8%8b%e4%b8%ad%e7%9a%84%e4%b8%bb%e8%a6%81%e6%8c%91%e6%88%b0-bqGCuaBGaR\">\u79fb\u690d\u904e\u7a0b\u4e2d\u7684\u4e3b\u8981\u6311\u6230<\/h2>\n<ul>\n<li><strong>\u8a9e\u6cd5\u5dee\u7570\uff1a<\/strong>Oracle \u548c DB2 \u5728 SQL \u8a9e\u6cd5\u4e0a\u6709\u8a31\u591a\u4e0d\u540c\u4e4b\u8655\u3002\u4f8b\u5982\uff0cOracle \u4f7f\u7528\u7684\u5e8f\u5217\uff08SEQUENCE\uff09\u5728 DB2 \u4e2d\u5247\u4f7f\u7528\u81ea\u589e\u5217\uff08IDENTITY\uff09\u4f86\u5be6\u73fe\u3002<\/li>\n<li><strong>\u6578\u64da\u985e\u578b\u4e0d\u4e00\u81f4\uff1a<\/strong>\u5169\u8005\u652f\u6301\u7684\u6578\u64da\u985e\u578b\u6709\u6240\u4e0d\u540c\u3002\u4f8b\u5982\uff0cOracle \u7684 VARCHAR2 \u5728 DB2 \u4e2d\u5c0d\u61c9\u70ba VARCHAR\uff0c\u4e14\u5728\u9577\u5ea6\u9650\u5236\u4e0a\u4e5f\u6709\u6240\u4e0d\u540c\u3002<\/li>\n<li><strong>\u51fd\u6578\u548c\u904b\u7b97\u7b26\u7684\u5dee\u7570\uff1a<\/strong>\u67d0\u4e9b\u5167\u5efa\u51fd\u6578\u5728 Oracle \u548c DB2 \u4e2d\u7684\u540d\u7a31\u548c\u7528\u6cd5\u53ef\u80fd\u4e0d\u540c\u3002\u4f8b\u5982\uff0cOracle \u7684 NVL \u51fd\u6578\u5728 DB2 \u4e2d\u5c0d\u61c9\u70ba COALESCE \u51fd\u6578\u3002<\/li>\n<li><strong>\u932f\u8aa4\u8655\u7406\u6a5f\u5236\uff1a<\/strong>Oracle \u548c DB2 \u7684\u932f\u8aa4\u8655\u7406\u6a5f\u5236\u4e5f\u6709\u6240\u4e0d\u540c\uff0c\u9019\u53ef\u80fd\u6703\u5f71\u97ff\u5230\u61c9\u7528\u7a0b\u5e8f\u7684\u7a69\u5b9a\u6027\u548c\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%a7%bb%e6%a4%8d%e7%9a%84%e6%ad%a5%e9%a9%9f-bqGCuaBGaR\">\u79fb\u690d\u7684\u6b65\u9a5f<\/h2>\n<p>\u5728\u9032\u884c Oracle SQL \u5230 DB2 SQL \u7684\u79fb\u690d\u6642\uff0c\u53ef\u4ee5\u9075\u5faa\u4ee5\u4e0b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e9%9c%80%e6%b1%82%e5%88%86%e6%9e%90-bqGCuaBGaR\">1. \u9700\u6c42\u5206\u6790<\/h3>\n<p>\u9996\u5148\uff0c\u5fc5\u9808\u5c0d\u73fe\u6709\u7684 Oracle SQL \u61c9\u7528\u7a0b\u5e8f\u9032\u884c\u5168\u9762\u7684\u9700\u6c42\u5206\u6790\uff0c\u78ba\u5b9a\u54ea\u4e9b\u529f\u80fd\u9700\u8981\u5728 DB2 \u4e2d\u5be6\u73fe\u3002<\/p>\n<h3 id=\"2-%e8%aa%9e%e6%b3%95%e8%bd%89%e6%8f%9b-bqGCuaBGaR\">2. \u8a9e\u6cd5\u8f49\u63db<\/h3>\n<p>\u63a5\u4e0b\u4f86\uff0c\u5c0d SQL \u8a9e\u53e5\u9032\u884c\u8a9e\u6cd5\u8f49\u63db\u3002\u9019\u53ef\u4ee5\u901a\u904e\u624b\u52d5\u7de8\u8f2f\u6216\u4f7f\u7528\u81ea\u52d5\u5316\u5de5\u5177\u4f86\u5b8c\u6210\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre><code>-- Oracle SQL\nSELECT NVL(column_name, 'default_value') FROM table_name;\n\n-- DB2 SQL\nSELECT COALESCE(column_name, 'default_value') FROM table_name;\n<\/code><\/pre>\n<h3 id=\"3-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e6%98%a0%e5%b0%84-bqGCuaBGaR\">3. \u6578\u64da\u985e\u578b\u6620\u5c04<\/h3>\n<p>\u78ba\u4fdd\u6240\u6709\u6578\u64da\u985e\u578b\u90fd\u6b63\u78ba\u6620\u5c04\u3002\u4f8b\u5982\uff0c\u5c07 Oracle \u7684 NUMBER \u985e\u578b\u8f49\u63db\u70ba DB2 \u7684 DECIMAL \u985e\u578b\u3002<\/p>\n<h3 id=\"4-%e6%b8%ac%e8%a9%a6%e8%88%87%e9%a9%97%e8%ad%89-bqGCuaBGaR\">4. \u6e2c\u8a66\u8207\u9a57\u8b49<\/h3>\n<p>\u5728\u5b8c\u6210\u8a9e\u6cd5\u8f49\u63db\u548c\u6578\u64da\u985e\u578b\u6620\u5c04\u5f8c\uff0c\u9032\u884c\u5168\u9762\u7684\u6e2c\u8a66\u4ee5\u78ba\u4fdd\u6240\u6709\u529f\u80fd\u6b63\u5e38\u904b\u884c\u3002\u9019\u5305\u62ec\u55ae\u5143\u6e2c\u8a66\u548c\u96c6\u6210\u6e2c\u8a66\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-bqGCuaBGaR\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<ul>\n<li><strong>\u4f7f\u7528\u81ea\u52d5\u5316\u5de5\u5177\uff1a<\/strong>\u8003\u616e\u4f7f\u7528\u5c08\u696d\u7684\u6578\u64da\u5eab\u9077\u79fb\u5de5\u5177\u4f86\u7c21\u5316\u904e\u7a0b\uff0c\u9019\u4e9b\u5de5\u5177\u53ef\u4ee5\u81ea\u52d5\u8655\u7406\u8a9e\u6cd5\u8f49\u63db\u548c\u6578\u64da\u985e\u578b\u6620\u5c04\u3002<\/li>\n<li><strong>\u4fdd\u6301\u6587\u6a94\u5b8c\u6574\uff1a<\/strong>\u5728\u79fb\u690d\u904e\u7a0b\u4e2d\uff0c\u4fdd\u6301\u8a73\u7d30\u7684\u6587\u6a94\u8a18\u9304\uff0c\u4ee5\u4fbf\u672a\u4f86\u7684\u7dad\u8b77\u548c\u5347\u7d1a\u3002<\/li>\n<li><strong>\u9032\u884c\u6027\u80fd\u6e2c\u8a66\uff1a<\/strong>\u5728\u9077\u79fb\u5b8c\u6210\u5f8c\uff0c\u9032\u884c\u6027\u80fd\u6e2c\u8a66\u4ee5\u78ba\u4fdd\u65b0\u7cfb\u7d71\u7684\u6027\u80fd\u7b26\u5408\u9810\u671f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-bqGCuaBGaR\">\u7e3d\u7d50<\/h2>\n<p>\u5f9e Oracle SQL \u5230 DB2 SQL \u7684\u79fb\u690d\u662f\u4e00\u500b\u8907\u96dc\u7684\u904e\u7a0b\uff0c\u6d89\u53ca\u8a9e\u6cd5\u8f49\u63db\u3001\u6578\u64da\u985e\u578b\u6620\u5c04\u548c\u529f\u80fd\u9a57\u8b49\u7b49\u591a\u500b\u65b9\u9762\u3002\u901a\u904e\u9075\u5faa\u4e0a\u8ff0\u6b65\u9a5f\u548c\u6700\u4f73\u5be6\u8e10\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u6e1b\u5c11\u79fb\u690d\u904e\u7a0b\u4e2d\u7684\u98a8\u96aa\u548c\u6311\u6230\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 Oracle SQL \u5230 DB2 SQL \u7684\u79fb\u690d\u904e\u7a0b\uff0c\u5206\u6790\u95dc\u9375\u5dee\u7570\u8207\u6311\u6230\uff0c\u52a9\u60a8\u9806\u5229\u8f49\u63db\u8cc7\u6599\u5eab\u7cfb\u7d71\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-154557","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/154557","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=154557"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/154557\/revisions"}],"predecessor-version":[{"id":154558,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/154557\/revisions\/154558"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=154557"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=154557"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=154557"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}