SUM和減去結果取決於由列結果在MySQL查詢

Question

我有以下查詢：

SELECT cashtransactionstatus_id, SUM(cashtransaction_amount) AS cashtransaction_amount 
    FROM cash_transactions 
    WHERE cashpaymenttype_id = 1 
    GROUP BY (cashtransactionstatus_id); 

該查詢返回：

如何我只能返回一個位數endtotal減法總和取決於列cashtransactionstatus_id？例如：

SUM Status(1,3): 1195.00 as col1

SUM Status(2,4,5): 430.00 as col2

然後show (col1 - col2) AS endtotal= 765.00

謝謝

Answer 1

可以使用條件集合體：

SELECT SUM(CASE WHEN cashtransactionstatus_id IN (1,3) THEN cashtransaction_amount END) - 
     SUM(CASE WHEN cashtransactionstatus_id IN (2,4,5) THEN cashtransaction_amount END) AS endtotal 
FROM cash_transactions 
WHERE cashpaymenttype_id = 1 

SQL Fiddle Demo