{"id":60991,"date":"2024-10-13T07:31:13","date_gmt":"2024-10-12T23:31:13","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60991\/"},"modified":"2024-10-13T07:31:13","modified_gmt":"2024-10-12T23:31:13","slug":"db2%e4%b8%ad%e9%80%b2%e8%a1%8csql%e9%99%a4%e6%b3%95%e9%81%8b%e7%ae%97%e7%b5%90%e6%9e%9c%e7%82%ba%e5%b0%8f%e6%95%b8%e6%99%82%e9%a1%af%e7%a4%ba0%e7%9a%84%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60991\/","title":{"rendered":"DB2\u4e2d\u9032\u884csql\u9664\u6cd5\u904b\u7b97\u7d50\u679c\u70ba\u5c0f\u6578\u6642\u986f\u793a0\u7684\u89e3\u6c7a\u65b9\u6848"},"content":{"rendered":"<h1 id=\"db2%e4%b8%ad%e9%80%b2%e8%a1%8csql%e9%99%a4%e6%b3%95%e9%81%8b%e7%ae%97%e7%b5%90%e6%9e%9c%e7%82%ba%e5%b0%8f%e6%95%b8%e6%99%82%e9%a1%af%e7%a4%ba0%e7%9a%84%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-DsgCpJQnHN\">DB2\u4e2d\u9032\u884cSQL\u9664\u6cd5\u904b\u7b97\u7d50\u679c\u70ba\u5c0f\u6578\u6642\u986f\u793a0\u7684\u89e3\u6c7a\u65b9\u6848<\/h1>\n<p>\u5728\u4f7f\u7528IBM DB2\u6578\u64da\u5eab\u9032\u884cSQL\u67e5\u8a62\u6642\uff0c\u958b\u767c\u8005\u7d93\u5e38\u6703\u9047\u5230\u9664\u6cd5\u904b\u7b97\u7684\u7d50\u679c\u986f\u793a\u70ba0\u7684\u554f\u984c\uff0c\u5c24\u5176\u662f\u5728\u9032\u884c\u5c0f\u6578\u904b\u7b97\u6642\u3002\u9019\u7a2e\u60c5\u6cc1\u901a\u5e38\u662f\u7531\u65bc\u6574\u6578\u9664\u6cd5\u7684\u7279\u6027\u6240\u5c0e\u81f4\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u9019\u4e00\u554f\u984c\u7684\u6839\u672c\u539f\u56e0\uff0c\u4e26\u63d0\u4f9b\u89e3\u6c7a\u65b9\u6848\uff0c\u4ee5\u78ba\u4fdd\u5728\u9032\u884c\u9664\u6cd5\u904b\u7b97\u6642\u80fd\u5920\u6b63\u78ba\u986f\u793a\u5c0f\u6578\u7d50\u679c\u3002<\/p>\n<h2 id=\"%e5%95%8f%e9%a1%8c%e5%88%86%e6%9e%90-DsgCpJQnHN\">\u554f\u984c\u5206\u6790<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u7576\u5169\u500b\u6574\u6578\u9032\u884c\u9664\u6cd5\u904b\u7b97\u6642\uff0c\u7d50\u679c\u6703\u88ab\u81ea\u52d5\u8f49\u63db\u70ba\u6574\u6578\uff0c\u9019\u610f\u5473\u8457\u5c0f\u6578\u90e8\u5206\u6703\u88ab\u622a\u65b7\u3002\u4f8b\u5982\uff0c\u7576\u57f7\u884c\u4ee5\u4e0bSQL\u8a9e\u53e5\u6642\uff1a<\/p>\n<pre><code>SELECT 5 \/ 2 AS result FROM SYSIBM.SYSDUMMY1;<\/code><\/pre>\n<p>\u7d50\u679c\u5c07\u986f\u793a\u70ba0\uff0c\u800c\u4e0d\u662f2.5\u3002\u9019\u662f\u56e0\u70baDB2\u5c075\u548c2\u90fd\u8996\u70ba\u6574\u6578\uff0c\u4e26\u4e14\u5728\u8a08\u7b97\u6642\u53ea\u4fdd\u7559\u6574\u6578\u90e8\u5206\u3002<\/p>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-DsgCpJQnHN\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u70ba\u4e86\u89e3\u6c7a\u9019\u4e00\u554f\u984c\uff0c\u6211\u5011\u9700\u8981\u78ba\u4fdd\u81f3\u5c11\u6709\u4e00\u500b\u64cd\u4f5c\u6578\u662f\u5c0f\u6578\u985e\u578b\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8cast%e5%87%bd%e6%95%b8-DsgCpJQnHN\">1. \u4f7f\u7528CAST\u51fd\u6578<\/h3>\n<p>\u53ef\u4ee5\u4f7f\u7528CAST\u51fd\u6578\u5c07\u6574\u6578\u8f49\u63db\u70ba\u5c0f\u6578\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT CAST(5 AS DECIMAL(10, 2)) \/ CAST(2 AS DECIMAL(10, 2)) AS result FROM SYSIBM.SYSDUMMY1;<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u7d50\u679c\u5c07\u6b63\u78ba\u986f\u793a\u70ba2.50\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e6%b5%ae%e9%bb%9e%e6%95%b8-DsgCpJQnHN\">2. \u4f7f\u7528\u6d6e\u9ede\u6578<\/h3>\n<p>\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u5c07\u5176\u4e2d\u4e00\u500b\u64cd\u4f5c\u6578\u8a2d\u7f6e\u70ba\u6d6e\u9ede\u6578\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT 5.0 \/ 2 AS result FROM SYSIBM.SYSDUMMY1;<\/code><\/pre>\n<p>\u9019\u6a23\uff0cDB2\u6703\u81ea\u52d5\u5c07\u904b\u7b97\u8996\u70ba\u6d6e\u9ede\u6578\u904b\u7b97\uff0c\u7d50\u679c\u5c07\u986f\u793a\u70ba2.5\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e5%b0%8f%e6%95%b8%e5%b8%b8%e9%87%8f-DsgCpJQnHN\">3. \u4f7f\u7528\u5c0f\u6578\u5e38\u91cf<\/h3>\n<p>\u5728SQL\u67e5\u8a62\u4e2d\u76f4\u63a5\u4f7f\u7528\u5c0f\u6578\u5e38\u91cf\u4e5f\u662f\u4e00\u500b\u7c21\u55ae\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT 5 \/ 2.0 AS result FROM SYSIBM.SYSDUMMY1;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u6b63\u78ba\u7684\u5c0f\u6578\u7d50\u679c2.5\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-DsgCpJQnHN\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u9664\u6cd5\u904b\u7b97\u6642\uff0c\u958b\u767c\u8005\u61c9\u8a72\u6ce8\u610f\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\u3002\u4f7f\u7528\u6574\u6578\u9032\u884c\u8a08\u7b97\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u610f\u5916\u7684\u7d50\u679c\u3002\u56e0\u6b64\uff0c\u5efa\u8b70\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u548c\u7de8\u5bebSQL\u67e5\u8a62\u6642\uff0c\u8003\u616e\u5230\u6578\u64da\u985e\u578b\u7684\u5f71\u97ff\uff0c\u7279\u5225\u662f\u5728\u6d89\u53ca\u5230\u9664\u6cd5\u904b\u7b97\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-DsgCpJQnHN\">\u7d50\u8ad6<\/h2>\n<p>\u5728DB2\u4e2d\u9032\u884cSQL\u9664\u6cd5\u904b\u7b97\u6642\uff0c\u82e5\u7d50\u679c\u986f\u793a\u70ba0\uff0c\u901a\u5e38\u662f\u56e0\u70ba\u6574\u6578\u9664\u6cd5\u7684\u7279\u6027\u3002\u901a\u904e\u4f7f\u7528CAST\u51fd\u6578\u3001\u6d6e\u9ede\u6578\u6216\u5c0f\u6578\u5e38\u91cf\uff0c\u53ef\u4ee5\u6709\u6548\u89e3\u6c7a\u9019\u4e00\u554f\u984c\uff0c\u78ba\u4fdd\u904b\u7b97\u7d50\u679c\u7684\u6b63\u78ba\u6027\u3002\u9019\u4e9b\u6280\u5de7\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u7684\u6e96\u78ba\u6027\uff0c\u9084\u80fd\u589e\u5f37\u6578\u64da\u8655\u7406\u7684\u9748\u6d3b\u6027\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u512a\u5316\u7684\u8cc7\u8a0a\uff0c\u60a8\u53ef\u4ee5\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\uff0c\u63a2\u7d22\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">VPS<\/a> 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