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11.21.2007 at 04:07AM PST, ID: 22975188
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6.4

Dedupe and Merge

Asked by stuartrobb in MS SQL Server, SQL Server 2005

Tags: ,

I have a large database of consumers with a unique matchkey made up of a joined field: name, address, postcode
We know there are duplicates in the database but they have different mobile telephone numbers.
We want to remove any duplicates and at the same time add the phone numbers the final remaining records.
So, for example:

These records:
David, Smith, 1 The High Street, London, W1 1AJ, 07777 111111
David, Smith, 1 The High Street, London, W1 1AJ, 07777 222222

Becomes this record:
David, Smith, 1 The High Street, London, W1 1AJ, 07777 111111, 07777 222222

I think this may need to be on two passes. One to mark the duplicates, a second to merge them and a third to delete the duplicates?

Thank you

Over to you experts....

PS: This is the code I normally use to run a basic dedupe by a matchkey:
alter table nameoftable
  add seq_num int identity
go
UPDATE  nameoftable
SET flag = '1'
from nameoftablea join
     (select matchkey, max(seq_num) max_seq_num from nameoftable
             group by matchkey
             having count(*) > 1) b
      on a.matchkey= b.matchkey
go
alter table nameoftable
 drop column seq_num




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Zones: MS SQL Server, SQL Server 2005
Tags: dedupe, merge
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Solution Provided By: fanopoe
Participating Experts: 4
Solution Grade: A
 
 
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