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;