SQL 将行变成列

Question

您好，可以将行值转换为列吗？我正在使用 ORACLE SQL 并且我想获取月份并将其转换为具有 kpi 值的列，如下所示。我尝试了分区和合并语句，但似乎没有任何效果。我真的很感激一些帮助。提前谢谢你。

输入数据：

department	year	month	kpi	value
A	2000	1	sales	5000
A	2000	1	revenue per client	120
A	2000	2	sales	6000
A	2000	2	revenue per client	140

期望的输出：

department	year	kpi	1	2
A	2000	sales	5000	6000
A	2000	revenue per client	120	140

Answer 1

您可以使用条件聚合：

select department, year, kpi,
       max(case when month = 1 then value end) as month_1,
       max(case when month = 2 then value end) as month_2
from t
group by department, year, kpi;

Answer 2

您可以使用 pivot 这样做：

架构和插入语句：

 create table mytable (department varchar(20),year int,month int,kpi varchar(50),value int);

 insert into mytable values('A',    2000,   1,  'sales' ,5000);
 insert into mytable values('A',    2000,   1,  'revenue per client',   120); 
 insert into mytable values('A',    2000,   2,  'sales' ,6000);
 insert into mytable values('A',    2000,   2,  'revenue per client',   140);

查询：

 select * from (
 select department,year,month,kpi,value
 from mytable
 )
 pivot
 (
     max(value)
     for month  in (1,2)
 )

输出：

DEPARTMENT	YEAR	KPI	1	2
A	2000	revenue per client	120	140
A	2000	sales	5000	6000

dbhere

SQL 将行变成列

SQL turn rows into columns

sql

oracle

pivot

procedure

oracle11g