Remove 1 instance of duplicate values T-SQL [duplicate]

Question

I currently have a table called People. Within this table there are thousands of rows of data which follow the below layout:

gkey |    Name |  Date       | Person_Id
1    |    Fred |  12/05/2012 | ABC123456
2    |    John |  12/05/2012 | DEF123456
3    |    Dave |  12/05/2012 | GHI123456
4    |    Fred |  12/05/2012 | JKL123456
5    |    Leno |  12/05/2012 | ABC123456

If I execute the following:

SELECT [PERSON_ID], COUNT(*) TotalCount
FROM [Database].[dbo].[People]
GROUP BY [PERSON_ID]
HAVING COUNT(*) > 1
ORDER BY COUNT(*) DESC

I get a return of:

Person_Id     | TotalCount
ABC123456     | 2

Now I would like to remove just one row of the duplicate values so when I execute the above query I return no results. Is this possible?

Answer 1

WITH a as
(
SELECT row_number() over (partition by [PERSON_ID] order by name) rn
FROM [Database].[dbo].[People]
)
DELETE FROM a
WHERE rn = 2