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Microsoft SQL query

Posted on 2016-11-02
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Last Modified: 2016-11-07
Hello, I am have trouble with this query,

Account number, balance, sum of transaction amounts, and balance - transaction sum for accounts in the New York branch that have at least ten transactions, order by account number.

Customer = {customerID, firstName, lastName, income, birthDate }
Account = {accNumber, type, balance, branchNumber(FK-Branch)}
Owns = {customerID(FK-Customer), accNumber(FK-Account)}
Transactions = {transNumber, accNumber(FK-Account), amount}
Employee = {sin, firstName, lastName, salary, branchNumber(FK-Branch)}
Branch = {branchNumber, branchName, managerSIN(FK-Employee), budget}

I am confused on how to check if they have at least 10 transactions. I have done an inner  join Account, Branch and Transactions but am unsure how to deal with the number of transactions done per account.
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Question by:Bob Tian
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7 Comments
 
LVL 32

Expert Comment

by:Pawan Kumar
ID: 41871385
Do you have sample data and the expected output ?
1
 
LVL 32

Expert Comment

by:Pawan Kumar
ID: 41871396
Try.. this

SELECT    
      a.accNumber          [Account]
	, a.balance            [balance]       
	, SUM(T.TransactionAmount) [Sum of Transactions]
	, a.balance - SUM(CASE WHEN branchNumber = 'New York' THEN T.TransactionAmount ELSE 0 END) Extracol
FROM Account a
INNER JOIN Branch b ON a.branchNumber = b.branchNumber
INNER JOIN Transactions T ON T.accNumber = a.accNumber
GROUP BY
      b.branchName
    , a.type
    , a.accNumber    
HAVING COUNT(T.transNumber) > 10
ORDER BY a.accNumber

Open in new window

1
 

Author Comment

by:Bob Tian
ID: 41873147
I think its b.branchName not b.branchNumber = 'New York'

Also the output would be something like:
AccNum  balance         Sum of Transactions     balance-Sum of Transactions
1               118231.13      12222                               106009.13
2               100808.03      2333                               98475.03

The problem is, I forgot to mention, is that the {transNumber} in Transaction does NOT indicate the amount of transactions done, it only represents a transaction number, combined with account number it uniquely identify a transaction. I am unsure how to find out how many transactions is done per account
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LVL 32

Expert Comment

by:Pawan Kumar
ID: 41873269
Yes it is branchName <<Typo>> :) Let me rewrite it for you ! Wait for sometime.
1
 
LVL 32

Accepted Solution

by:
Pawan Kumar earned 2000 total points
ID: 41873346
Updated...

This is how we can count transactions for each account.
, COUNT(*) OVER (PARTITION BY a.accNumber) TransactionPerAccount

SELECT    
      a.accNumber          [Account]
	, a.balance            [balance]       
	, SUM(T.TransactionAmount) [Sum of Transactions]
	, a.balance - SUM(CASE WHEN branchName = 'New York' THEN T.TransactionAmount ELSE 0 END) Extracol
	, COUNT(*) OVER (PARTITION BY a.accNumber) TransactionPerAccount
FROM Account a
INNER JOIN Branch b ON a.branchNumber = b.branchNumber
INNER JOIN Transactions T ON T.accNumber = a.accNumber
GROUP BY
      b.branchName
    , a.type
    , a.accNumber    
HAVING COUNT(*) > 10
ORDER BY a.accNumber

Open in new window


You want only those records where each account has more than 10 transaction ? If Yes then use below -

SELECT * FROM 
(
	SELECT    
		  a.accNumber          [Account]
		, a.balance            [balance]       
		, SUM(T.TransactionAmount) [Sum of Transactions]
		, a.balance - SUM(CASE WHEN branchName = 'New York' THEN T.TransactionAmount ELSE 0 END) Extracol
		, COUNT(*) OVER (PARTITION BY a.accNumber) TransactionPerAccount
	FROM Account a
	INNER JOIN Branch b ON a.branchNumber = b.branchNumber
	INNER JOIN Transactions T ON T.accNumber = a.accNumber
	GROUP BY
		  b.branchName
		, a.type
		, a.accNumber  
)x
WHERE x.TransactionPerAccount > 10 	  
ORDER BY x.Account

--

Open in new window



Hope it helps !!
1
 
LVL 32

Expert Comment

by:Pawan Kumar
ID: 41876682
Hi Bob,
Is this done?

Regards,
Pawan
0
 

Author Closing Comment

by:Bob Tian
ID: 41877539
thanks
0

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