UNPIVOT與SQL Workbench/J和亞馬遜aws紅移

Question

我試圖在表上使用unpivot。我使用Workbench/J作爲客戶端來進行亞馬遜紅移。下面的SELECT語句不工作：

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

我得到以下錯誤：

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

如果可能的話，我想使用UNPIVOT而不是UNION，它不承認UNNEST作爲功能。

Answer 1

UNPIVOT語法正確但不是每個數據庫都支持該功能。

你可能要考慮使用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