如何从这张表中得到总和？

Question

如何从两个表中得到总和？

1. res_transactions
2. TRANS_ADD

查询：

select 
    tranid, Qty, Price 
from 
    res_transactions 
where 
    order_no = '16104' 
    and tranid = '506060' 
order by
    tranid asc

select 
    FTRN, Qty, Price 
from 
    TRANS_ADD  
where 
    FTRN = '506060'

请查看附加快照以获取更多信息

例外输出

 Qty * Price

总价应为： 13.6

Answer 1

从res_transactions获得总和：

SELECT TRANID AS ID, SUM(QTY*PRICE) AS TOTAL
FROM RES_TRANSACTIONS WHERE ORDER_NO='16104' AND TRANID='506060'
GROUP BY TRANID

TRANS_ADD相同：

SELECT FTRN AS ID, SUM(QTY*PRICE) AS TOTAL
FROM TRANS_ADD  WHERE FTRN='506060'
GROUP BY FTRN

因此，如果您想要找到这两个值的总和，可以使用union all关键字。 不要使用union ，因为它会删除重复的行。

SELECT ID, SUM(TOTAL) AS TOTAL FROM (
    SELECT TRANID AS ID, SUM(QTY*PRICE) AS TOTAL FROM RES_TRANSACTIONS WHERE ORDER_NO='16104' AND TRANID='506060' GROUP BY TRANID
    UNION ALL
    SELECT FTRN AS ID, SUM(QTY*PRICE) AS TOTAL FROM TRANS_ADD  WHERE FTRN='506060' GROUP BY FTRN
) TBL

Answer 2

select sum(result) as sumresult from 
    (select Qty * Price as result from res_transactions where order_no='16104' and tranid='506060'
     union all
     select Qty * Price as result from TRANS_ADD  where FTRN='506060'
     )t

Answer 3

试试这个

SELECT Qty,Price,Qty*Price
FROM TRANS_ADD T,res_transactions R 
WHERE T.FTRN=R.tranid
AND T.FTRN=506060
AND R.order_no = 16104;

这是你的预期输出.... ????