UNPIVOT与SQL Workbench/J和亚马逊aws红移

Question

我试图在表上使用unpivot。我使用Workbench/J作为客户端来进行亚马逊红移。下面的SELECT语句不工作：

SELECT 
    campaign_id, 
    C.B, 
    C.A 
FROM campaign 
UNPIVOT 
(
    A FOR B IN (item1, item2, item3) 
) AS C 

我得到以下错误：

ERROR: syntax error at or near "for" Position: 62 [SQL State=42601]

如果可能的话，我想使用UNPIVOT而不是UNION，它不承认UNNEST作为功能。

Answer 1

UNPIVOT语法正确但不是每个数据库都支持该功能。

你可能要考虑使用UNION ALL：

select campaign_id, 'item1' as B, item1 as A 
from campaign 
union all 
select campaign_id, 'item2' as B, item2 as A 
from campaign 
union all 
select campaign_id, 'item3' as B, item3 as A 
from campaign