我想用用mysql

Question

在上述表我要總結多個條件使用單個查詢總和和substarct函數創建查詢，其中ledgertype='Earning'和其中。減去 ledgertype='Deduction'並顯示這兩個值.....如何寫查詢？

在此先感謝...

Answer 1

您可以使用它來實現。由於您想打印收入和扣減，所以我使用了子查詢。

select sum_earnings , sum_deduction , sum_earnings - sum_deduction 
from (select sum(case when ledgertype = 'Earning' then ledgervalue end) sum_earrnings, sum(case when ledgertype = 'Deductions' then ledgervalue end) as sum(sum_deduction) 
from ratecard) a 

Answer 2

我無法理解「兩個值」，但你可以得到兩種類型的總結：

Select SUM(ledgerValue), ledgerType FROM ratecard group by ledgerType 

Answer 3

SELECT (SUM_VAL - SUBSTRACT_VAL) as balance FROM 
(
select sum(ledgerValue) AS SUM_VAL FROM ratecard WHERE ledgerType ='Earning', 
select sum(ledgerValue) AS SUBSTRACT_VAL FROM ratecard WHERE ledgerType = 'substract' 
) t1 

Answer 4

如果你想運行總，你可以使用一個變量來計算。

DROP TABLE IF EXISTS T; 
CREATE TABLE T (ID INT,AMOUNT INT, TYP VARCHAR(10)); 
INSERT INTO T VALUES 
(1,12500,'Earnings'),(2,3200,'Earnings'),(3,1200,'Earnings'), 
(4,1200,'Deductions'),(5,200,'Deductions'),(6,600,'Deductions'),(7,500,'Deductions'), 
(8,12000,'Earnings'),(9,3200,'Deductions'); 


select t.*, 
     if(t.`typ` = 'Earnings' ,@rt:=@rt+amount,@rt:=@rt-amount) RunningTotal 
from t 
,(select @rt:=0) rt; 
order by t.id 

+------+--------+------------+--------------+ 
| ID | AMOUNT | TYP  | RunningTotal | 
+------+--------+------------+--------------+ 
| 1 | 12500 | Earnings |  12500 | 
| 2 | 3200 | Earnings |  15700 | 
| 3 | 1200 | Earnings |  16900 | 
| 4 | 1200 | Deductions |  15700 | 
| 5 | 200 | Deductions |  15500 | 
| 6 | 600 | Deductions |  14900 | 
| 7 | 500 | Deductions |  14400 | 
| 8 | 12000 | Earnings |  26400 | 
| 9 | 3200 | Deductions |  23200 | 
+------+--------+------------+--------------+ 
9 rows in set (0.00 sec)