{"id":5316,"date":"2024-11-14T12:29:00","date_gmt":"2024-11-14T04:29:00","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5316\/"},"modified":"2024-11-14T12:29:00","modified_gmt":"2024-11-14T04:29:00","slug":"oracle-decode%e5%87%bd%e6%95%b0%e6%80%8e%e4%b9%88%e7%94%a8-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5316\/","title":{"rendered":"oracle\u00a0decode\u51fd\u6570\u600e\u4e48\u7528"},"content":{"rendered":"

\n oracle decode\u51fd\u6570\u662f\u4e00\u79cd\u6761\u4ef6\u51fd\u6570\uff0c\u53ef\u6839\u636e\u6307\u5b9a\u7684\u5339\u914d\u6761\u4ef6\u5c06\u8f93\u5165\u8868\u8fbe\u5f0f\u66ff\u6362\u4e3a\u6307\u5b9a\u7684\u503c\u3002\u8bed\u6cd5\u4e3adecode(expression, value1, result1, value2, result2, …, default_result)\uff0c\u5176\u4e2dexpression\u662f\u8bc4\u4f30\u7684\u8868\u8fbe\u5f0f\uff0cvalue1\u3001value2\u662f\u5339\u914d\u503c\uff0cresult1\u3001result2\u662f\u5339\u914d\u540e\u7684\u66ff\u6362\u503c\uff0cdefault_result\u662f\u672a\u5339\u914d\u65f6\u7684\u9ed8\u8ba4\u503c\u3002\n<\/p><\/blockquote>\n

\"oracle\u00a0decode\u51fd\u6570\u600e\u4e48\u7528\u63d2\u56fe\"<\/p>\n

Oracle DECODE\u51fd\u6570\u7528\u6cd5<\/strong><\/p>\n

Oracle DECODE\u51fd\u6570\u662f\u4e00\u79cd\u7528\u4e8e\u66ff\u6362\u548c\u5339\u914d\u503c\u7684\u6761\u4ef6\u51fd\u6570\u3002\u5b83\u6839\u636e\u6307\u5b9a\u7684\u5339\u914d\u6761\u4ef6\u5c06\u8f93\u5165\u8868\u8fbe\u5f0f\u66ff\u6362\u4e3a\u6307\u5b9a\u7684\u503c\u3002<\/p>\n

\u8bed\u6cd5<\/strong><\/p>\n

DECODE(expression, value1, result1, value2, result2, ..., default_result)<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u53c2\u6570<\/strong><\/p>\n
    \n
  •  expression<\/strong>\uff1a\u8981\u8bc4\u4f30\u7684\u8868\u8fbe\u5f0f\u3002<\/li>\n
  •  value1, value2, …<\/strong>: \u8981\u5339\u914d\u7684\u7b2c\u4e00\u4e2a\u3001\u7b2c\u4e8c\u4e2a\u3001…\u503c\u3002<\/li>\n
  •  result1, result2, …<\/strong>: \u5982\u679cexpression\u4e0evalue1\u3001value2\u5339\u914d\uff0c\u5219\u8fd4\u56de\u76f8\u5e94\u7684result\u3002<\/li>\n
  •  default_result<\/strong>: \u5982\u679cexpression\u4e0e\u4efb\u4f55\u6307\u5b9a\u7684\u503c\u90fd\u4e0d\u5339\u914d\uff0c\u5219\u8fd4\u56de\u7684\u9ed8\u8ba4\u503c\u3002<\/li>\n<\/ul>\n
    \u7528\u6cd5<\/strong><\/p>\n
    DECODE\u51fd\u6570\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5bf9expression\u8fdb\u884c\u8bc4\u4f30\uff1a<\/p>\n
      \n
    1. \u6309\u987a\u5e8f\u68c0\u67e5expression\u662f\u5426\u4e0evalue1\u3001value2\u7b49\u6307\u5b9a\u7684\u503c\u5339\u914d\u3002<\/li>\n
    2. \u5982\u679c\u5339\u914d\uff0c\u5219\u8fd4\u56de\u4e0e\u5176\u5339\u914d\u7684\u76f8\u5e94result\u3002<\/li>\n
    3. \u5982\u679cexpression\u4e0e\u4efb\u4f55\u6307\u5b9a\u7684\u503c\u90fd\u4e0d\u5339\u914d\uff0c\u5219\u8fd4\u56dedefault_result\u3002<\/li>\n<\/ol>\n
      \u793a\u4f8b<\/strong><\/p>\n
      \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3a\u201cstatus\u201d\u7684\u5217\uff0c\u5176\u4e2d\u5305\u542b\u4ee5\u4e0b\u503c\uff1a<\/p>\n
        \n
      • ‘A’\uff1a\u6d3b\u8dc3<\/li>\n
      • ‘I’\uff1a\u4e0d\u6d3b\u8dc3<\/li>\n
      • ‘P’\uff1a\u6682\u505c<\/li>\n<\/ul>\n
        \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528DECODE\u51fd\u6570\u5c06\u8fd9\u4e9b\u503c\u66ff\u6362\u4e3a\u66f4\u53cb\u597d\u7684\u6587\u672c\u6807\u7b7e\uff1a<\/p>\n
        SELECT status, DECODE(status, 'A', '\u6d3b\u8dc3', 'I', '\u4e0d\u6d3b\u8dc3', 'P', '\u6682\u505c', '\u672a\u77e5') AS status_label\nFROM my_table;<\/pre>\n
         \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
        \u8f93\u51fa<\/strong><\/p>\n\n\n\n\n\n\n\n
        status<\/th>\nstatus_label<\/th>\n<\/tr>\n<\/thead>\n
        A<\/td>\n\u6d3b\u8dc3<\/td>\n<\/tr>\n
        I<\/td>\n\u4e0d\u6d3b\u8dc3<\/td>\n<\/tr>\n
        P<\/td>\n\u6682\u505c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
        \u4ee5\u4e0a\u5c31\u662f decode\u51fd\u6570\u600e\u4e48\u7528\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
        oracle decode\u51fd\u6570\u662f\u4e00\u79cd\u6761\u4ef6\u51fd\u6570\uff0c\u53ef\u6839\u636e\u6307\u5b9a\u7684\u5339\u914d\u6761\u4ef6\u5c06\u8f93\u5165\u8868\u8fbe\u5f0f\u66ff\u6362\u4e3a\u6307\u5b9a\u7684\u503c\u3002\u8bed\u6cd5\u4e3adecode(expression, value1, result1, value2, result2, …, default_result)\uff0c\u5176\u4e2dexpression\u662f\u8bc4\u4f30\u7684\u8868\u8fbe\u5f0f\uff0cvalue1\u3001value2\u662f\u5339\u914d\u503c\uff0cresult1\u3001result2\u662f\u5339\u914d\u540e\u7684\u66ff\u6362\u503c\uff0cdefault_result\u662f\u672a\u5339\u914d\u65f6\u7684\u9ed8\u8ba4\u503c\u3002 Oracle DECODE\u51fd\u6570\u7528\u6cd5 Oracle DECODE\u51fd\u6570\u662f\u4e00\u79cd\u7528\u4e8e\u66ff\u6362\u548c\u5339\u914d\u503c\u7684\u6761\u4ef6\u51fd\u6570\u3002\u5b83\u6839\u636e\u6307\u5b9a\u7684\u5339\u914d\u6761\u4ef6\u5c06\u8f93\u5165\u8868\u8fbe\u5f0f\u66ff\u6362\u4e3a\u6307\u5b9a\u7684\u503c\u3002 \u8bed\u6cd5 DECODE(expression, value1, result1, value2, result2, …, default_result) \u767b\u5f55\u540e\u590d\u5236 \u53c2\u6570 expression\uff1a\u8981\u8bc4\u4f30\u7684\u8868\u8fbe\u5f0f\u3002 value1, value2, …: \u8981\u5339\u914d\u7684\u7b2c\u4e00\u4e2a\u3001\u7b2c\u4e8c\u4e2a\u3001…\u503c\u3002 result1, result2, …: \u5982\u679cexpression\u4e0evalue1\u3001value2\u5339\u914d\uff0c\u5219\u8fd4\u56de\u76f8\u5e94\u7684result\u3002 default_result: \u5982\u679cexpression\u4e0e\u4efb\u4f55\u6307\u5b9a\u7684\u503c\u90fd\u4e0d\u5339\u914d\uff0c\u5219\u8fd4\u56de\u7684\u9ed8\u8ba4\u503c\u3002 \u7528\u6cd5 DECODE\u51fd\u6570\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5bf9expression\u8fdb\u884c\u8bc4\u4f30\uff1a \u6309\u987a\u5e8f\u68c0\u67e5expression\u662f\u5426\u4e0evalue1\u3001value2\u7b49\u6307\u5b9a\u7684\u503c\u5339\u914d\u3002 \u5982\u679c\u5339\u914d\uff0c\u5219\u8fd4\u56de\u4e0e\u5176\u5339\u914d\u7684\u76f8\u5e94result\u3002 \u5982\u679cexpression\u4e0e\u4efb\u4f55\u6307\u5b9a\u7684\u503c\u90fd\u4e0d\u5339\u914d\uff0c\u5219\u8fd4\u56dedefault_result\u3002 \u793a\u4f8b \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3a\u201cstatus\u201d\u7684\u5217\uff0c\u5176\u4e2d\u5305\u542b\u4ee5\u4e0b\u503c\uff1a ‘A’\uff1a\u6d3b\u8dc3 ‘I’\uff1a\u4e0d\u6d3b\u8dc3 ‘P’\uff1a\u6682\u505c \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528DECODE\u51fd\u6570\u5c06\u8fd9\u4e9b\u503c\u66ff\u6362\u4e3a\u66f4\u53cb\u597d\u7684\u6587\u672c\u6807\u7b7e\uff1a SELECT status, DECODE(status, ‘A’, ‘\u6d3b\u8dc3’, ‘I’, ‘\u4e0d\u6d3b\u8dc3’, ‘P’, ‘\u6682\u505c’, ‘\u672a\u77e5’) AS […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5316","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5316","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5316"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5316\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5316"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5316"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5316"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}