一个SQL查询，显示不需要的重排（连接3个表时）

Question

I have been searching for a solution for this problem for quite sometime, i found some similar problems to mine but non of the proposed solution worked.

I want to join these 3 tables.

(1) ADM

• AID = Primary Key
• BedNo = int

(2) ADMdeposite :

• DID = Primary Key
• AID = Foreign key
• Dvalue = money
• Dvalue = Date

(3) Reservation :

• ID = Primary Key
• AID = Foreign key
• Type = Nvchar
• Value = Money
• Pname = Nvarchar

I used this query

SELECT        
    Reservation.AID, Reservation.type, Reservation.value, Reservation.pname, 
    ADMdeposit.Ddate, ADMdeposit.Dvalue
FROM
    ADM 
INNER JOIN
    ADMdeposit ON ADM.AID = ADMdeposit.AID 
INNER JOIN
    Reservation ON ADM.AID = Reservation.AID

I get the wanted results however the problem is, the ADMdeposite.Dvalue cell duplicates itself to the total number of Reservation.Type number of cells

Here is a print screen of the actual data in the ADMdeposite.Dvalue table

Here is the result of the query:

Here is the result I WANT:

Answer 1

After reading the comments and seeing that your goal is to calculate balances (deposits minus reservations), I would suggest summing the amounts of all deposits for each adm, do the same for the reservations, then join those 2 results together in order to calculate the balance :

SELECT d.aid, 
       d.TotalDeposits, 
       r.TotalReservations, 
       d.TotalDeposits - r.TotalReservations as Balance 
FROM
(SELECT ADMdeposit.aid, SUM(ADMdeposit.dvalue) as TotalDeposits
FROM ADMdeposit GROUP BY ADMdeposit.aid) as d

INNER JOIN

(SELECT Reservation.AID, SUM(Reservation.value) as TotalReservations
FROM Reservation GROUP BY Reservation.AID) as r
ON d.AID = r.AID