oracle decode 函数实现行转列

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----创建测试表

create table student_score(

       name varchar2(20),subject varchar2(20),score number(4,1)

 

);

 

-----插入测试数据

insert into student_score (name,subject,score)values('张三','语文',78);

 

insert into student_score (name,'数学',88);

 

insert into student_score (name,'英语',98);

 

 

insert into student_score (name,score)values('李四',89);

 

insert into student_score (name,76);

 

insert into student_score (name,90);

 

 

insert into student_score (name,score)values('王五',99);

 

insert into student_score (name,66);

 

insert into student_score (name,91);

 

-----decode行转列

select name "姓名",sum(decode(subject,nvl(score,0),0)) "语文",0)) "数学",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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