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oracle 列转行

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Release: 2016-06-07 15:26:28
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1.新建一个名为TEST表 2.向TEST表中添加数据 INSERT INTO TEST(STUDENT,COURSE,SCORE) select '张三','语文',78 from dual union select '张三','数学',87 from dual union select '张三','英语',82 from dual union select '张三','物理',90 from dual unio

1.新建一个名为TEST表

2.向TEST表中添加数据

INSERT INTO TEST(STUDENT,COURSE,SCORE)
select '张三','语文',78 from dual union
select '张三','数学',87 from dual union 
select '张三','英语',82 from dual union
select '张三','物理',90 from dual union
select '李四','语文',65 from dual union
select '李四','数学',77 from dual union
select '李四','英语',65 from dual union
select '李四','物理',85 from dual

表数据如下:

oracle 列转行

3.列转行

方法··1:

select 
    Student,
    sum(decode(Course, '数学', Score)) 数学,
    sum(decode(Course, '物理', Score)) 物理,
    sum(decode(Course, '英语', Score)) 英语,
    sum(decode(Course, '语文', Score)) 语文
from 
    TEST 
group by Student

方法··2:

select
    Student,
    sum(case Course when '数学' then Score else null end) 数学,
    sum(case Course when '物理' then Score else null end) 物理,
    sum(case Course when '英语' then Score else null end) 英语,
    sum(case Course when '语文' then Score else null end) 语文
from 
    TEST 
group by Student

效果如下:

oracle 列转行


注:sum是求和的意思;比如说里面记录里面有两条张三,列转行显示的结果就会是两个张三的结果之和。

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