如何Postgres的

Question

我需要在Postgres一起使用透视使用数据透视，下面是基表

下面是所需的输出

请帮我查询。

Answer 1

这实际上是一个非支点，没有支点

select year, week, 'loading' as area, loading as value 
from the_table 
union all 
select year, week, 'picking', picking 
from the_table 
union all 
select year, week, 'painting', painting 
from the_table 

Answer 2

如果只有3，您需要转动柱子，然后用union

select year,week,'loading' as aread,loading as val from tbl 
union all 
select year,week,'painting' as area,painting as val from tbl 
union all 
select year,week,'picking' as area,picking as val from tbl 

如果列的数量是动态的，那么我建议你使用动态数据透视表。

Dynamic pivot query using PostgreSQL 9.3

http://www.cureffi.org/2013/03/19/automatically-creating-pivot-table-column-names-in-postgresql/