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  • orcle行转列

    -----decode行转列
     
    select name "姓名",
     
           sum(decode(subject, '语文', nvl(score, 0), 0)) "语文",
     
           sum(decode(subject, '数学', nvl(score, 0), 0)) "数学",
     
           sum(decode(subject, '英语', nvl(score, 0), 0)) "英语"
     
      from student_score
     
     group by name;
     
      
     
    ------ case when 行转列
     
      
     
    select name "姓名",
     
           sum(case when subject='语文'
     
           then nvl(score,0)
     
           else 0
     
           end) "语文",
     
           sum(case when subject='数学'
     
           then nvl(score,0)
     
           else 0
     
           end) "数学",
     
           sum(case when subject='英语'
     
           then nvl(score,0)
     
           else 0
     
           end) "英语"
     
          from student_score
     
           group by name;
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  • 原文地址:https://www.cnblogs.com/lengzhijun/p/5658496.html
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