PostgreSQL CASE WHEN Then ELSE END錯誤

Question

當我們使用v9.1時，我工作得很好，但是在升級到v9.4後，以下失敗。

SELECT a.account_id 
     ( 
       select round(cast(sum(WHEN c.transaction_type = 'Ranger' THEN c.original_currency ELSE c.original_currency * -1 
     end)) AS NUMERIC), 
         2) 
FROM  account_transaction AS c 
WHERE a.account_id = c.account_id 
GROUP BY c.account_id) 
AS 
    balance_amount 
    FROM account 
AS 
    a LEFT JOIN account_type 
AS 
    b ON a.account_type_id = b.account_type_id 
    WHERE ( 
    b.description >= 'Boomberang' AND b.description <= 'Boomberang' 
); 

語法錯誤或接近WHEN

我用Google搜索，但未能解決問題。請幫忙。

Answer 1

看起來你缺少CASE關鍵字，試試這個來代替：

(CASE WHEN c.transaction_type = 'Ranger' THEN c.original_currency ELSE c.original_currency * -1 END) 

Answer 2

您的意思是CASE WHEN而不是WHEN嗎？