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10.01.2008 at 10:40AM PDT, ID: 23778931
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9.1

Help with SQL query and update

Asked by gfk76 in MS SQL Server, SQL Query Syntax, SQL Server 2005

Tags:

Hi Experts!

I was hoping one of you SQL gurus could help with a SQL Query for my MS SQL 2005 database.

I have a customer table with approxmently 300 000 records.
In this table some customers are listed more than once with the same customerid.
My Table looks like this

ID (Bigint,ISIdentity=Yes)
Customerid(nvarchar)
Lastname(nvarchar)
Firstname(nvarchar)
Adress(nvarchar)
Zip(nvarchar)
City(nvarchar)
Duplicate(bit)

I have a query today that helps me list all duplicates, but I would like to flag the customer with
the highest ID as a duplicate record.
See third record marked with'*'

See example
ID      Customerid      Firstname      Lastname      Adress            Zip      City      Duplicate
1      100000            James            Clark            Evergreen 5      12345      Mytown      False
2      100002            Jane            Doe            Somestreet 3      12345      Hertown      False
*3      100000            James            Clark            Evergreen 5      12345      Mytown      True

The query that I use to list duplicates are as follows:

SELECT * FROM
Customers A Inner Join (
Select Customerid, Lastname, Firstname
from Customers
group by Customerid, Lastname, Firstname
having count(*)>1 )T
ON A.Customerid = T.Customerid

Is it possible to update the customer with the higest ID with a True Flag from this query.

I am pretty new to SQL, and any help would be much appreciated.

Best regards
gfk76
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[+][-]10.01.2008 at 10:45AM PDT, ID: 22616963

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About this solution

Zones: MS SQL Server, SQL Query Syntax, SQL Server 2005
Tags: MS SQL
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Solution Provided By: BrandonGalderisi
Participating Experts: 3
Solution Grade: A
 
 
[+][-]10.01.2008 at 10:48AM PDT, ID: 22617001

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