{"id":199602,"date":"2025-05-04T23:38:16","date_gmt":"2025-05-04T15:38:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/?p=199602"},"modified":"2025-05-04T23:38:16","modified_gmt":"2025-05-04T15:38:16","slug":"sql-server%e4%b8%ad%e7%9a%84-isnumeric-%e5%87%bd%e6%95%b0%ef%bc%9a%e7%a1%ae%e4%bf%9d%e6%95%b0%e6%8d%ae%e5%87%86%e7%a1%ae%e6%80%a7%e7%9a%84%e5%ae%88%e6%8a%a4%e8%80%85","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199602\/","title":{"rendered":"SQL Server\u4e2d\u7684 ISNUMERIC \u51fd\u6570\uff1a\u786e\u4fdd\u6570\u636e\u51c6\u786e\u6027\u7684\u5b88\u62a4\u8005"},"content":{"rendered":"

\u4e00\u3001ISNUMERIC \u51fd\u6570\u7b80\u4ecb<\/h4>\n

ISNUMERIC<\/code> \u51fd\u6570\u7528\u4e8e\u68c0\u67e5\u7ed9\u5b9a\u6570\u636e\u662f\u5426\u4e3a\u6570\u503c\u7c7b\u578b\u3002\u5728\u6570\u636e\u5e93\u64cd\u4f5c\u4e2d\uff0c\u5f53\u6211\u4eec\u9700\u8981\u786e\u4fdd\u67d0\u4e00\u5217\u7684\u6570\u636e\u4e3a\u6570\u503c\u7c7b\u578b\u65f6\uff0cISNUMERIC<\/code> \u662f\u4e00\u4e2a\u975e\u5e38\u9ad8\u6548\u7684\u5de5\u5177\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u5728\u7ba1\u7406\u8d22\u52a1\u6570\u636e\uff0c\u8f93\u5165\u7684\u91d1\u989d\u5b57\u6bb5\u53ef\u80fd\u4f1a\u56e0\u4e3a\u8bef\u64cd\u4f5c\u800c\u51fa\u73b0\u975e\u6570\u503c\u6570\u636e\uff0c\u8fd9\u65f6 ISNUMERIC<\/code> \u53ef\u4ee5\u5e2e\u52a9\u4f60\u6709\u6548\u7b5b\u9009\u51fa\u4e0d\u7b26\u5408\u89c4\u8303\u7684\u8bb0\u5f55\uff0c\u4ece\u800c\u51cf\u5c11\u9519\u8bef\u53d1\u751f\u3002<\/p>\n

\u4e8c\u3001\u57fa\u7840\u5e94\u7528\uff1a\u9a8c\u8bc1\u6570\u636e\u5217\u662f\u5426\u4e3a\u6570\u503c<\/h4>\n

\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u8ba2\u5355\u8868 Orders<\/code>\uff0c\u5176\u4e2d OrderAmount<\/code> \u5217\u8bb0\u5f55\u4e86\u8ba2\u5355\u91d1\u989d\u3002\u7531\u4e8e\u6570\u636e\u5f55\u5165\u95ee\u9898\uff0c\u67d0\u4e9b\u8bb0\u5f55\u4e2d\u7684\u91d1\u989d\u6570\u636e\u53ef\u80fd\u5b58\u5728\u975e\u6570\u503c\u5b57\u7b26\uff08\u5982\u5b57\u6bcd\u6216\u7b26\u53f7\uff09\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 ISNUMERIC<\/code> \u51fd\u6570\u68c0\u67e5\u54ea\u4e9b\u6570\u636e\u5b58\u5728\u95ee\u9898\u3002<\/p>\n

\u8ba2\u5355\u8868\u7ed3\u6784\uff1a<\/strong><\/p>\n\n\n\n\n\n\n\n
OrderID<\/th>\nOrderAmount<\/th>\n<\/tr>\n<\/thead>\n
1001<\/td>\n123.45<\/td>\n<\/tr>\n
1002<\/td>\n‘abc’<\/td>\n<\/tr>\n
1003<\/td>\n567<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u9a8c\u8bc1\u4ee3\u7801\u793a\u4f8b\uff1a<\/strong><\/p>\n

SELECT \r\n    OrderID,\r\n    OrderAmount,\r\n    ISNUMERIC(OrderAmount) AS IsNumeric\r\nFROM \r\n    Orders;\r\n<\/code><\/pre>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0cISNUMERIC<\/code> \u4f1a\u5bf9 OrderAmount<\/code> \u5217\u4e2d\u7684\u6bcf\u4e00\u884c\u6570\u636e\u8fdb\u884c\u5224\u65ad\u3002\u5982\u679c\u6570\u636e\u53ef\u4ee5\u88ab\u89e3\u91ca\u4e3a\u6570\u503c\uff0c\u5219\u8fd4\u56de 1\uff1b\u5426\u5219\u8fd4\u56de 0\u3002\u6267\u884c\u6b64\u67e5\u8be2\u540e\u7684\u7ed3\u679c\u5c06\u663e\u793a\u54ea\u4e9b\u6570\u636e\u4e3a\u6709\u6548\u7684\u6570\u503c\uff0c\u54ea\u4e9b\u5219\u4e0d\u7b26\u5408\u8981\u6c42\u3002<\/p>\n
\u67e5\u8be2\u7ed3\u679c\uff1a<\/strong><\/p>\n\n\n\n\n\n\n\n
OrderID<\/th>\nOrderAmount<\/th>\nIsNumeric<\/th>\n<\/tr>\n<\/thead>\n
1001<\/td>\n123.45<\/td>\n1<\/td>\n<\/tr>\n
1002<\/td>\n‘abc’<\/td>\n0<\/td>\n<\/tr>\n
1003<\/td>\n567<\/td>\n1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u901a\u8fc7 ISNUMERIC<\/code> \u51fd\u6570\uff0c\u6211\u4eec\u80fd\u591f\u5feb\u901f\u8bc6\u522b\u5e76\u7b5b\u9664\u4e0d\u7b26\u5408\u6570\u503c\u6807\u51c6\u7684\u6570\u636e\uff0c\u4e3a\u540e\u7eed\u7684\u6570\u636e\u6e05\u7406\u63d0\u4f9b\u4e86\u4fbf\u5229\u3002<\/p>\n
\u4e09\u3001\u8fdb\u9636\u5e94\u7528\uff1a\u7ed3\u5408 CASE \u8bed\u53e5\u5904\u7406\u5f02\u5e38\u6570\u636e<\/h4>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5355\u7eaf\u53d1\u73b0\u95ee\u9898\u8fd8\u4e0d\u591f\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u91c7\u53d6\u63aa\u65bd\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u3002\u4f8b\u5982\uff0c\u5f53\u9047\u5230\u975e\u6570\u503c\u7684\u8ba2\u5355\u91d1\u989d\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 CASE<\/code> \u8bed\u53e5\u5c06\u5176\u66ff\u6362\u4e3a\u9ed8\u8ba4\u503c\uff08\u5982 0\uff09\uff0c\u4ee5\u4fdd\u8bc1\u540e\u7eed\u7684\u7edf\u8ba1\u548c\u8ba1\u7b97\u4e0d\u4f1a\u53d7\u5230\u5f71\u54cd\u3002<\/p>\n
\u4ee3\u7801\u793a\u4f8b\uff1a<\/strong><\/p>\n
SELECT \r\n    OrderID,\r\n    CASE \r\n        WHEN ISNUMERIC(OrderAmount) = 1 THEN CAST(OrderAmount AS DECIMAL(10, 2))\r\n        ELSE 0\r\n    END AS ValidOrderAmount\r\nFROM \r\n    Orders;\r\n<\/code><\/pre>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528 CASE<\/code> \u8bed\u53e5\u7ed3\u5408 ISNUMERIC<\/code> \u51fd\u6570\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u652f\u5904\u7406\u3002\u5bf9\u4e8e\u6709\u6548\u7684\u6570\u503c\u6570\u636e\uff0c\u6211\u4eec\u5c06\u5176\u8f6c\u6362\u4e3a\u6307\u5b9a\u7684\u6570\u503c\u683c\u5f0f\uff1b\u5bf9\u4e8e\u65e0\u6548\u6570\u636e\uff0c\u5219\u5c06\u5176\u8bbe\u7f6e\u4e3a 0\u3002\u8fd9\u6837\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u4e00\u81f4\u6027\uff0c\u4e3a\u8fdb\u4e00\u6b65\u7684\u5206\u6790\u63d0\u4f9b\u53ef\u9760\u57fa\u7840\u3002<\/p>\n
\u56db\u3001\u7279\u6b8a\u573a\u666f\u5e94\u7528\uff1a\u6570\u636e\u5bfc\u5165\u524d\u7684\u6709\u6548\u6027\u68c0\u67e5<\/h4>\n
\u5728\u6570\u636e\u5bfc\u5165\u8fc7\u7a0b\u4e2d\uff0c\u68c0\u67e5\u6570\u636e\u7684\u6709\u6548\u6027\u662f\u81f3\u5173\u91cd\u8981\u7684\u3002\u5982\u679c\u6211\u4eec\u4ece\u5916\u90e8\u6e90\uff08\u5982 CSV \u6587\u4ef6\uff09\u5bfc\u5165\u6570\u636e\uff0c\u5fc5\u987b\u786e\u4fdd\u6570\u636e\u683c\u5f0f\u6b63\u786e\u3002\u867d\u7136\u5728 SQL Server \u4e2d\u65e0\u6cd5\u76f4\u63a5\u64cd\u4f5c CSV \u6587\u4ef6\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u5148\u5c06\u6570\u636e\u5bfc\u5165\u6682\u5b58\u8868\uff0c\u7136\u540e\u4f7f\u7528 ISNUMERIC<\/code> \u51fd\u6570\u8fdb\u884c\u9a8c\u8bc1\u3002<\/p>\n
\u793a\u4f8b\uff1a<\/strong><\/p>\n
SELECT \r\n    COUNT(*) AS InvalidCount\r\nFROM \r\n    Staging_Sales\r\nWHERE \r\n    ISNUMERIC(SalesAmount) = 0;\r\n<\/code><\/pre>\n
\u8fd9\u6bb5\u4ee3\u7801\u7528\u4e8e\u68c0\u67e5\u5bfc\u5165\u5230\u6682\u5b58\u8868 Staging_Sales<\/code> \u4e2d\u7684 SalesAmount<\/code> \u5217\u662f\u5426\u5b58\u5728\u975e\u6570\u503c\u6570\u636e\u3002\u5982\u679c InvalidCount<\/code> \u5927\u4e8e 0\uff0c\u8868\u793a\u6709\u65e0\u6548\u6570\u636e\uff0c\u9700\u8fdb\u4e00\u6b65\u5904\u7406\u540e\u518d\u6b63\u5f0f\u5bfc\u5165\u5230\u76ee\u6807\u8868\u3002<\/p>\n
\u4e94\u3001\u7ed3\u8bed\uff1a\u4fdd\u8bc1\u6570\u636e\u8d28\u91cf\uff0c\u9009\u62e9\u9999\u6e2f\u670d\u52a1\u5668\u4e3a\u6570\u636e\u7ba1\u7406\u63d0\u4f9b\u53ef\u9760\u652f\u6301<\/h4>\n
\u901a\u8fc7\u4ee5\u4e0a\u65b9\u6cd5\uff0cISNUMERIC<\/code> \u51fd\u6570\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5feb\u901f\u8bc6\u522b\u548c\u5904\u7406\u4e0d\u7b26\u5408\u6570\u503c\u6807\u51c6\u7684\u6570\u636e\u3002\u7136\u800c\uff0c\u6570\u636e\u7684\u6b63\u786e\u6027\u548c\u5b89\u5168\u6027\u8fd8\u9700\u8981\u7a33\u5b9a\u7684\u670d\u52a1\u5668\u73af\u5883\u652f\u6301\u3002\u5728\u6b64\uff0c\u6211\u4eec\u63a8\u8350\u4f7f\u7528 \u9999\u6e2f\u4e91\u670d\u52a1\u5668<\/a><\/strong>\uff0c\u5176\u9ad8\u6027\u80fd\u3001\u9ad8\u7a33\u5b9a\u6027\u80fd\u591f\u4e3a\u60a8\u7684\u6570\u636e\u7ba1\u7406\u548c\u4e1a\u52a1\u8fd0\u884c\u63d0\u4f9b\u575a\u5b9e\u7684\u4fdd\u969c\u3002\u65e0\u8bba\u662f\u5927\u6570\u636e\u5904\u7406\uff0c\u8fd8\u662f\u65e5\u5e38\u7684\u6570\u636e\u5b58\u50a8\uff0c\u9999\u6e2f\u670d\u52a1\u5668\u90fd\u80fd\u63d0\u4f9b\u5feb\u901f\u3001\u7a33\u5b9a\u7684\u670d\u52a1\uff0c\u786e\u4fdd\u60a8\u7684\u7cfb\u7edf\u9ad8\u6548\u8fd0\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u3001ISNUMERIC \u51fd\u6570\u7b80\u4ecb...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-199602","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199602","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=199602"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199602\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199602"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199602"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199602"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}