어떻게이 문은 4 열 테이블을 생성합니다

Question

4 열의 합계를받을 수 있나요?

Answer 1

으로 두 쿼리를 결합합니다.

SELECT SUM(results.amount) 
FROM 
(
SELECT -price*quantity AS amount 
    FROM product JOIN shipped ON (product.id = shipped.product) 
UNION 
    SELECT amount 
    FROM 
... 
) results 

Answer 2

SUM(-price*quantity) 

huh?

Answer 3

는

sum(price*quantity) 

을 시도하거나 내가 모든 것을 하위 쿼리를 사용하려면

SELECT badguy,rdate,notes,SUM(AMOUNT) FROM(
     SELECT shipped.badguy AS badguy, shipped.sdate AS LineDate, 
     'Delivery' AS Legend, -price*quantity AS amount 
    FROM product JOIN shipped ON (product.id = shipped.product) 
UNION 
    SELECT receipt.badguy, receipt.rdate,notes, amount 
    FROM) A 

Answer 4

외부 쿼리가 원하는 합계를 얻는 다른 쿼리에서 쿼리를 래핑하십시오. 그러면 쿼리가 하위 쿼리이됩니다.

SELECT SUM(amount) FROM (
    SELECT shipped.badguy AS badguy, shipped.sdate AS LineDate, 
      'Delivery' AS Legend, -price*quantity AS amount 
     FROM product JOIN shipped ON (product.id = shipped.product) 
    UNION 
    SELECT receipt.badguy, receipt.rdate,notes, amount 
    FROM <...> 
)