Highest rank fro same customer

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SQL-Server-2008R2

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I have around 10,000 customer data containing customer number, account number & account rank (1,2,3,4). several customers have multiple account numbers. i want to update highest rank for unique customer number. i.e account rank must be same for single customer.

Let me know the query to get this kind of data & update the same.

example.

Customer, account, rank
a,1,0
b,2,1
a,3,3
a,4,2
c,5,0

so in above case i require to update rank=3 for account number 1 & 4.

What I have tried:

SQL

select customer,max(rank) where count(customer)>1 group by customer

Posted 19-May-20 7:32am

Hemil Gandhi

Updated 19-May-20 7:58am

Maciej Los

v2

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Comments

Maciej Los 19-May-20 13:45pm

Your select statement is invalid, so you can't get above result.

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Maciej Los · Accepted Answer · 2020-05-19T07:59:00

Try this:

SQL

DECLARE @customer TABLE(Customer VARCHAR(50), account int, [rank] int)

INSERT INTO @customer (Customer, account, [rank])
VALUES('a',1,0),
('b',2,1),
('a',3,3),
('a',4,2),
('c',5,0)

UPDATE t1 SET [rank] =  t2.MaxRank
FROM @Customer t1 INNER JOIN 
	(
		SELECT Customer, MAX([rank]) MaxRank 
		FROM @customer
		GROUP BY Customer
		) t2 
	ON t1.Customer  = t2.Customer