{"id":199980,"date":"2025-05-06T09:06:10","date_gmt":"2025-05-06T01:06:10","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199980\/"},"modified":"2025-05-06T09:06:10","modified_gmt":"2025-05-06T01:06:10","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3oracle-sql%e4%b8%ad%e7%9a%84%e9%99%a4%e6%b3%95%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199980\/","title":{"rendered":"\u6df1\u5165\u7406\u89e3Oracle SQL\u4e2d\u7684\u9664\u6cd5\u64cd\u4f5c"},"content":{"rendered":"

<\/b> <\/p>\n

\u6df1\u5165\u7406\u89e3Oracle SQL\u4e2d\u7684\u9664\u6cd5\u64cd\u4f5c<\/h1>\n

\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~<\/p>\n

Oracle SQL\u4e2d\u7684\u9664\u6cd5\u8fd0\u7b97\u8be6\u89e3<\/p>\n

\u5728Oracle SQL\u4e2d\uff0c\u9664\u6cd5\u8fd0\u7b97\u662f\u4e00\u79cd\u5e38\u89c1\u4e14\u91cd\u8981\u7684\u6570\u5b66\u8fd0\u7b97\u64cd\u4f5c\uff0c\u7528\u4e8e\u8ba1\u7b97\u4e24\u4e2a\u6570\u76f8\u9664\u7684\u7ed3\u679c\u3002\u9664\u6cd5\u5728\u6570\u636e\u5e93\u67e5\u8be2\u4e2d\u7ecf\u5e38\u7528\u5230\uff0c\u56e0\u6b64\u4e86\u89e3Oracle SQL\u4e2d\u7684\u9664\u6cd5\u8fd0\u7b97\u53ca\u5176\u7528\u6cd5\u662f\u6570\u636e\u5e93\u5f00\u53d1\u4eba\u5458\u5fc5\u5907\u7684\u6280\u80fd\u4e4b\u4e00\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u8ba8\u8bbaOracle SQL\u4e2d\u9664\u6cd5\u8fd0\u7b97\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u4f9b\u8bfb\u8005\u53c2\u8003\u3002<\/p>\n

\u4e00\u3001Oracle SQL\u4e2d\u7684\u9664\u6cd5\u8fd0\u7b97\u7b26<\/p>\n

\u5728Oracle SQL\u4e2d\uff0c\u9664\u6cd5\u8fd0\u7b97\u4f7f\u7528\u9664\u6cd5\u8fd0\u7b97\u7b26 “\/” \u6765\u8868\u793a\uff0c\u5373\u5c06\u88ab\u9664\u6570\u9664\u4ee5\u9664\u6570\u6765\u6c42\u5f97\u5546\u3002\u9664\u6cd5\u8fd0\u7b97\u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

\u88ab\u9664\u6570 \/ \u9664\u6570<\/pre>\n
\u5176\u4e2d\uff0c\u88ab\u9664\u6570\u8868\u793a\u9700\u8981\u88ab\u9664\u4ee5\u7684\u6570\uff0c\u9664\u6570\u8868\u793a\u7528\u6765\u9664\u4ee5\u88ab\u9664\u6570\u7684\u6570\u3002\u5728\u6267\u884c\u9664\u6cd5\u8fd0\u7b97\u65f6\uff0cOracle SQL\u4f1a\u81ea\u52a8\u8ba1\u7b97\u51fa\u5546\u7684\u7ed3\u679c\uff0c\u5e76\u8fd4\u56de\u7ed9\u7528\u6237\u3002<\/p>\n
\u4e8c\u3001\u6574\u6570\u9664\u6cd5\u548c\u6d6e\u70b9\u6570\u9664\u6cd5<\/p>\n
\u5728Oracle SQL\u4e2d\uff0c\u9664\u6cd5\u8fd0\u7b97\u6839\u636e\u88ab\u9664\u6570\u548c\u9664\u6570\u7684\u6570\u636e\u7c7b\u578b\u53ef\u4ee5\u5206\u4e3a\u6574\u6570\u9664\u6cd5\u548c\u6d6e\u70b9\u6570\u9664\u6cd5\u4e24\u79cd\u60c5\u51b5\u3002\u6574\u6570\u9664\u6cd5\u662f\u6307\u5f53\u88ab\u9664\u6570\u548c\u9664\u6570\u90fd\u4e3a\u6574\u6570\u65f6\u8fdb\u884c\u7684\u9664\u6cd5\u8fd0\u7b97\uff0c\u6b64\u65f6\u8ba1\u7b97\u7ed3\u679c\u4e5f\u4f1a\u662f\u6574\u6570\uff0c\u5c0f\u6570\u90e8\u5206\u4f1a\u88ab\u622a\u65ad\u3002\u800c\u6d6e\u70b9\u6570\u9664\u6cd5\u5219\u662f\u6307\u5f53\u88ab\u9664\u6570\u6216\u9664\u6570\u4e2d\u81f3\u5c11\u6709\u4e00\u4e2a\u4e3a\u6d6e\u70b9\u6570\u65f6\u8fdb\u884c\u7684\u9664\u6cd5\u8fd0\u7b97\uff0c\u6b64\u65f6\u8ba1\u7b97\u7ed3\u679c\u4f1a\u4fdd\u7559\u5c0f\u6570\u90e8\u5206\u3002<\/p>\n
\u4e0b\u9762\u5206\u522b\u7ed9\u51fa\u6574\u6570\u9664\u6cd5\u548c\u6d6e\u70b9\u6570\u9664\u6cd5\u7684\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n
    \n
  1. \u6574\u6570\u9664\u6cd5\u793a\u4f8b\uff1a<\/li>\n<\/ol>\n
    SELECT 10 \/ 3 FROM dual;<\/pre>\n
    \u6267\u884c\u4ee5\u4e0a\u8bed\u53e5\uff0c\u7ed3\u679c\u4e3a 3\u3002\u56e0\u4e3a 10 \u9664\u4ee5 3 \u7684\u5546\u662f 3\uff0c\u4e0d\u8003\u8651\u5c0f\u6570\u90e8\u5206\u3002<\/p>\n
      \n
    1. \u6d6e\u70b9\u6570\u9664\u6cd5\u793a\u4f8b\uff1a<\/li>\n<\/ol>\n
      SELECT 10.0 \/ 3 FROM dual;<\/pre>\n
      \u6267\u884c\u4ee5\u4e0a\u8bed\u53e5\uff0c\u7ed3\u679c\u4e3a 3.333333333333333\u3002\u56e0\u4e3a\u88ab\u9664\u6570\u4e3a\u6d6e\u70b9\u6570\uff0c\u6240\u4ee5\u8ba1\u7b97\u7ed3\u679c\u4e5f\u4f1a\u4fdd\u7559\u5c0f\u6570\u90e8\u5206\u3002<\/p>\n
      \u4e09\u3001\u9664\u6570\u4e3a\u96f6\u7684\u60c5\u51b5<\/p>\n
      \u5728\u8fdb\u884c\u9664\u6cd5\u8fd0\u7b97\u65f6\uff0c\u5982\u679c\u9664\u6570\u4e3a\u96f6\uff0cOracle SQL\u4f1a\u629b\u51fa\u5f02\u5e38\u5e76\u62a5\u9519\uff0c\u56e0\u4e3a\u5728\u6570\u5b66\u8fd0\u7b97\u4e2d\u9664\u6570\u4e0d\u80fd\u4e3a\u96f6\u3002\u56e0\u6b64\uff0c\u5728\u8fdb\u884c\u9664\u6cd5\u8fd0\u7b97\u65f6\uff0c\u786e\u4fdd\u9664\u6570\u4e0d\u4e3a\u96f6\u662f\u81f3\u5173\u91cd\u8981\u7684\u3002<\/p>\n
      \u4e0b\u9762\u7ed9\u51fa\u4e00\u4e2a\u9664\u6570\u4e3a\u96f6\u7684\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n
      SELECT 10 \/ 0 FROM dual;<\/pre>\n
      \u6267\u884c\u4ee5\u4e0a\u8bed\u53e5\uff0cOracle SQL\u4f1a\u62a5\u9519\u5e76\u63d0\u793a “ORA-01476: \u9664\u96f6\u9519\u8bef”\uff0c\u5373\u9664\u6570\u4e0d\u80fd\u4e3a\u96f6\u3002<\/p>\n
      \u56db\u3001\u4f7f\u7528\u51fd\u6570\u5904\u7406\u9664\u6570\u4e3a\u96f6\u7684\u60c5\u51b5<\/p>\n
      \u4e3a\u4e86\u907f\u514d\u9664\u6570\u4e3a\u96f6\u5bfc\u81f4\u7684\u5f02\u5e38\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u51fd\u6570\u6765\u5904\u7406\u8fd9\u79cd\u60c5\u51b5\u3002Oracle SQL\u4e2d\u63d0\u4f9b\u4e86 NVL \u51fd\u6570\u548c CASE WHEN \u8bed\u53e5\u6765\u5224\u65ad\u9664\u6570\u662f\u5426\u4e3a\u96f6\uff0c\u5e76\u8fd4\u56de\u76f8\u5e94\u7684\u7ed3\u679c\u3002<\/p>\n
      \u4e0b\u9762\u7ed9\u51fa\u4f7f\u7528 NVL \u51fd\u6570\u5904\u7406\u9664\u6570\u4e3a\u96f6\u7684\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n
      SELECT NVL(10 \/ NULLIF(0, 0), 0) FROM dual;<\/pre>\n
      \u6267\u884c\u4ee5\u4e0a\u8bed\u53e5\uff0c\u7ed3\u679c\u4e3a 0\u3002\u5f53\u9664\u6570\u4e3a\u96f6\u65f6\uff0cNULLIF \u51fd\u6570\u4f1a\u8fd4\u56de NULL\uff0c\u7136\u540e NVL \u51fd\u6570\u5c06 NULL \u66ff\u6362\u4e3a 0\uff0c\u907f\u514d\u4e86\u9664\u6570\u4e3a\u96f6\u65f6\u7684\u5f02\u5e38\u3002<\/p>\n
      \u7efc\u4e0a\u6240\u8ff0\uff0c\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd\u4e86Oracle SQL\u4e2d\u9664\u6cd5\u8fd0\u7b97\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e76\u63d0\u4f9b\u4e86\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u4f9b\u8bfb\u8005\u53c2\u8003\u3002\u9664\u6cd5\u8fd0\u7b97\u5728\u6570\u636e\u5e93\u67e5\u8be2\u4e2d\u662f\u7ecf\u5e38\u4f7f\u7528\u7684\u6570\u5b66\u8fd0\u7b97\u64cd\u4f5c\uff0c\u638c\u63e1\u5176\u7528\u6cd5\u53ef\u4ee5\u5e2e\u52a9\u6570\u636e\u5e93\u5f00\u53d1\u4eba\u5458\u66f4\u52a0\u7075\u6d3b\u5730\u5904\u7406\u6570\u636e\u3002\u901a\u8fc7\u5b66\u4e60\u672c\u6587\uff0c\u8bfb\u8005\u53ef\u4ee5\u66f4\u597d\u5730\u7406\u89e3\u548c\u8fd0\u7528Oracle SQL\u4e2d\u7684\u9664\u6cd5\u8fd0\u7b97\u3002<\/p>\n
      \u4eca\u5929\u5173\u4e8e\u300a\u6df1\u5165\u7406\u89e3Oracle SQL\u4e2d\u7684\u9664\u6cd5\u64cd\u4f5c\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u8be6\u89e3,\u9664\u6cd5\u8fd0\u7b97\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n
      \n
      \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
      \u6df1\u5165\u7406\u89e3Oracle SQL\u4e2d\u7684...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-199980","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199980","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=199980"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199980\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}