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Adding and subtracting in inner joins

I have two tables:

Allowance  [Account ID] key
Claims     [Account ID], [Claim #] key

I am querying the two via a inner join. I am using account ID to complete the join.The allowance table stores the alowance dollar amount [allowance amount] allocated for the account. There is one record per account. The claim table has the [dollar transactions] that has posted to the account. There are multiple transactions [dollar transactions] in the second table in relationship to the first [account].

How do I sum the [dollar transaction] by [Account Id] in the claims table? And display the difference (varaice) between the [dollar transaction] in the second table table and [account amount] in the fisrt table?

Here you go:

SELECT Allowance.AccountID,
       MAX(Allowance.AllowanceAmount) as AllowanceAmount,
       SUM(Claims.Amount) as ClaimsTotal,
       MAX(Allowance.AllowanceAmount) ?
         SUM(Claims.Amount) as Variance
  FROM Allowance, Claims
  WHERE Allowance.AccountID = Claims.AccountID
  GROUP BY Allowance.AccountID

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