{"id":178718,"date":"2024-11-08T20:19:28","date_gmt":"2024-11-08T12:19:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/178718\/"},"modified":"2024-11-08T20:19:28","modified_gmt":"2024-11-08T12:19:28","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9postgresql%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a22012-division_by_zero%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/178718\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc\uff1a22012 &#8211; division_by_zero\uff1f"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9postgresql%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a22012-division_by_zero-JTATOaDZIG\">\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc\uff1a22012 &#8211; division_by_zero<\/h1>\n<p>\u5728\u4f7f\u7528PostgreSQL\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\u4ee3\u78bc\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u932f\u8aa4\u4ee3\u78bc22012\uff0c\u8868\u793a\u201cdivision_by_zero\u201d\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u57f7\u884c\u9664\u6cd5\u904b\u7b97\u6642\uff0c\u7576\u9664\u6578\u70ba\u96f6\u6642\uff0c\u6578\u64da\u5eab\u6703\u62cb\u51fa\u6b64\u932f\u8aa4\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u6210\u56e0\u3001\u5f71\u97ff\u4ee5\u53ca\u5982\u4f55\u6709\u6548\u5730\u4fee\u5fa9\u5b83\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e7%9a%84%e6%88%90%e5%9b%a0-JTATOaDZIG\">\u932f\u8aa4\u7684\u6210\u56e0<\/h2>\n<p>PostgreSQL\u7684division_by_zero\u932f\u8aa4\u4e3b\u8981\u662f\u7531\u65bc\u4ee5\u4e0b\u5e7e\u500b\u539f\u56e0\u5f15\u8d77\u7684\uff1a<\/p>\n<ul>\n<li><strong>\u9664\u6578\u70ba\u96f6\uff1a<\/strong>\u6700\u5e38\u898b\u7684\u539f\u56e0\u662f\u9664\u6578\u7684\u503c\u70ba\u96f6\u3002\u5728\u6578\u5b78\u4e2d\uff0c\u4efb\u4f55\u6578\u5b57\u9664\u4ee5\u96f6\u90fd\u662f\u672a\u5b9a\u7fa9\u7684\uff0c\u56e0\u6b64\u6578\u64da\u5eab\u6703\u5831\u932f\u3002<\/li>\n<li><strong>\u6578\u64da\u985e\u578b\u554f\u984c\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6578\u64da\u985e\u578b\u7684\u8f49\u63db\u53ef\u80fd\u5c0e\u81f4\u9664\u6578\u7684\u503c\u610f\u5916\u8b8a\u70ba\u96f6\u3002\u4f8b\u5982\uff0c\u5c07\u4e00\u500bNULL\u503c\u6216\u7a7a\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u6578\u5b57\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u9664\u6578\u70ba\u96f6\u3002<\/li>\n<li><strong>\u908f\u8f2f\u932f\u8aa4\uff1a<\/strong>\u5728\u67e5\u8a62\u4e2d\uff0c\u908f\u8f2f\u932f\u8aa4\u53ef\u80fd\u5c0e\u81f4\u8a08\u7b97\u7d50\u679c\u4e0d\u5982\u9810\u671f\uff0c\u5f9e\u800c\u5f15\u767c\u9664\u4ee5\u96f6\u7684\u60c5\u6cc1\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9division_by_zero%e9%8c%af%e8%aa%a4-JTATOaDZIG\">\u5982\u4f55\u4fee\u5fa9division_by_zero\u932f\u8aa4<\/h2>\n<p>\u4fee\u5fa9PostgreSQL\u7684division_by_zero\u932f\u8aa4\u901a\u5e38\u9700\u8981\u5c0d\u67e5\u8a62\u9032\u884c\u8abf\u6574\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u89e3\u6c7a\u65b9\u6848\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e9%99%a4%e6%95%b8%e7%9a%84%e5%80%bc-JTATOaDZIG\">1. \u6aa2\u67e5\u9664\u6578\u7684\u503c<\/h3>\n<p>\u5728\u57f7\u884c\u9664\u6cd5\u904b\u7b97\u4e4b\u524d\uff0c\u61c9\u8a72\u6aa2\u67e5\u9664\u6578\u7684\u503c\u662f\u5426\u70ba\u96f6\u3002\u53ef\u4ee5\u4f7f\u7528CASE\u8a9e\u53e5\u4f86\u907f\u514d\u9664\u4ee5\u96f6\u7684\u60c5\u6cc1\uff1a<\/p>\n<pre><code>SELECT \n    CASE \n        WHEN denominator = 0 THEN NULL \n        ELSE numerator \/ denominator \n    END AS result\nFROM your_table;<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u5982\u679c\u9664\u6578\u70ba\u96f6\uff0c\u67e5\u8a62\u5c07\u8fd4\u56deNULL\uff0c\u800c\u4e0d\u662f\u62cb\u51fa\u932f\u8aa4\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8nullif%e5%87%bd%e6%95%b8-JTATOaDZIG\">2. \u4f7f\u7528NULLIF\u51fd\u6578<\/h3>\n<p>PostgreSQL\u63d0\u4f9b\u4e86\u4e00\u500b\u540d\u70baNULLIF\u7684\u51fd\u6578\uff0c\u53ef\u4ee5\u7528\u4f86\u907f\u514d\u9664\u4ee5\u96f6\u7684\u60c5\u6cc1\u3002NULLIF\u51fd\u6578\u6703\u6bd4\u8f03\u5169\u500b\u503c\uff0c\u5982\u679c\u76f8\u7b49\u5247\u8fd4\u56deNULL\uff0c\u5426\u5247\u8fd4\u56de\u7b2c\u4e00\u500b\u503c\u3002\u9019\u6a23\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u9664\u4ee5\u96f6\u7684\u932f\u8aa4\uff1a<\/p>\n<pre><code>SELECT \n    numerator \/ NULLIF(denominator, 0) AS result\nFROM your_table;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5982\u679cdenominator\u70ba\u96f6\uff0cNULLIF\u5c07\u8fd4\u56deNULL\uff0c\u5f9e\u800c\u907f\u514d\u4e86division_by_zero\u932f\u8aa4\u3002<\/p>\n<h3 id=\"3-%e6%95%b8%e6%93%9a%e9%a9%97%e8%ad%89-JTATOaDZIG\">3. \u6578\u64da\u9a57\u8b49<\/h3>\n<p>\u5728\u63d2\u5165\u6216\u66f4\u65b0\u6578\u64da\u4e4b\u524d\uff0c\u9032\u884c\u6578\u64da\u9a57\u8b49\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u78ba\u4fdd\u5728\u6578\u64da\u5eab\u4e2d\u5b58\u5132\u7684\u6578\u64da\u4e0d\u6703\u5c0e\u81f4\u9664\u4ee5\u96f6\u7684\u60c5\u6cc1\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5728\u61c9\u7528\u5c64\u9032\u884c\u6aa2\u67e5\uff0c\u6216\u8005\u4f7f\u7528\u6578\u64da\u5eab\u7d04\u675f\u4f86\u9650\u5236\u9664\u6578\u7684\u503c\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-JTATOaDZIG\">\u7d50\u8ad6<\/h2>\n<p>PostgreSQL\u7684division_by_zero\u932f\u8aa4\u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\uff0c\u4f46\u901a\u904e\u9069\u7576\u7684\u6aa2\u67e5\u548c\u8655\u7406\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u9019\u7a2e\u60c5\u6cc1\u3002\u4f7f\u7528CASE\u8a9e\u53e5\u3001NULLIF\u51fd\u6578\u4ee5\u53ca\u9032\u884c\u6578\u64da\u9a57\u8b49\u90fd\u662f\u4fee\u5fa9\u6b64\u932f\u8aa4\u7684\u6709\u6548\u65b9\u6cd5\u3002\u4e86\u89e3\u9019\u4e9b\u6280\u5de7\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u7a69\u5b9a\u6027\uff0c\u9084\u80fd\u63d0\u5347\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6027\u80fd\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684\u6578\u64da\u5eab\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u61c9\u7528\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc22012\uff08division_by_zero\uff09\uff0c\u907f\u514d\u9664\u4ee5\u96f6\u7684\u554f\u984c\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u67e5\u8a62\u6b63\u5e38\u904b\u884c\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-178718","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178718","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=178718"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178718\/revisions"}],"predecessor-version":[{"id":178719,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178718\/revisions\/178719"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=178718"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=178718"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=178718"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}