Delete duplicate records in SQL Server?

If you're looking for a way to remove duplicates, yet you have a foreign key pointing to the table with duplicates, you could take the following approach using a slow yet effective cursor.

It will relocate the duplicate keys on the foreign key table.

create table #properOlvChangeCodes(
    id int not null,
    name nvarchar(max) not null
)

DECLARE @name VARCHAR(MAX);
DECLARE @id INT;
DECLARE @newid INT;
DECLARE @oldid INT;

DECLARE OLVTRCCursor CURSOR FOR SELECT id, name FROM Sales_OrderLineVersionChangeReasonCode; 
OPEN OLVTRCCursor;
FETCH NEXT FROM OLVTRCCursor INTO @id, @name;
WHILE @@FETCH_STATUS = 0  
BEGIN  
        -- determine if it should be replaced (is already in temptable with name)
        if(exists(select * from #properOlvChangeCodes where Name=@name)) begin
            -- if it is, finds its id
            Select  top 1 @newid = id
            from    Sales_OrderLineVersionChangeReasonCode
            where   Name = @name

            -- replace terminationreasoncodeid in olv for the new terminationreasoncodeid
            update Sales_OrderLineVersion set ChangeReasonCodeId = @newid where ChangeReasonCodeId = @id

            -- delete the record from the terminationreasoncode
            delete from Sales_OrderLineVersionChangeReasonCode where Id = @id
        end else begin
            -- insert into temp table if new
            insert into #properOlvChangeCodes(Id, name)
            values(@id, @name)
        end

        FETCH NEXT FROM OLVTRCCursor INTO @id, @name;
END;
CLOSE OLVTRCCursor;
DEALLOCATE OLVTRCCursor;

drop table #properOlvChangeCodes

delete from person 
where ID not in
(
        select t.id from 
        (select min(ID) as id from person 
         group by email 
        ) as t
);

Please see the below way of deletion too.

Declare @Employee table (EmployeeName varchar(10))

Insert into @Employee values 
('Anand'),('Anand'),('Anil'),('Dipak'),
('Anil'),('Dipak'),('Dipak'),('Anil')

Select * from @Employee

Created a sample table named @Employee and loaded it with given data.

Delete  aliasName from (
Select  *,
        ROW_NUMBER() over (Partition by EmployeeName order by EmployeeName) as rowNumber
From    @Employee) aliasName 
Where   rowNumber > 1

Select * from @Employee

Result:

I know, this is asked six years ago, posting just incase it is helpful for anyone.