ms sql leads deduplication

i have 30k records of leads (companynames,contact names, zip, state, city,phone) which may have duplications. what is the best to find duplication in my SQL database. ( in older goldmine there was duplicate finder where you can set weight to every field say Conact Name - 10, zip - 5 , city 5, company name 10, phone number 10  and let us say if sum is 20 on when compare two records they will be duplicate suspect)
I am looking for a similar script which will help deduplicate
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ste5anSenior DeveloperCommented:
You can only look for identity or you may use SOUNDEX(), which only works for US names. Another approach would be using a edit metric like Levenshtein.

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dsackerContract ERP Admin/ConsultantCommented:
Hi Leop1212. You may want to compare those fields for duplication very much like the other thread you have going, in particular, post ID 40854691 there.

Change the table name(s) and field names as needed. Perhaps something like this:

SELECT  company,
        REPLACE(REPLACE(REPLACE(Zip, '-', ''), ' ', ''), '.', '') AS zip,
        REPLACE(REPLACE(REPLACE(REPLACE(Phone, '-', ''), '(', ''), ')', ''), ' ', '') AS phone,
        COUNT(1) AS dupeCount
FROM    YourTable
GROUP BY company,
        REPLACE(REPLACE(REPLACE(Zip, '-', ''), ' ', ''), '.', ''),
        REPLACE(REPLACE(REPLACE(REPLACE(Phone, '-', ''), '(', ''), ')', ''), ' ', '')

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Microsoft SQL Server 2008

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