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Delete Duplicate Record in SQL Server

Let's create a table and name it NewTable.

Syntax

  1. Create table NewTable  
  2.   
  3. (  
  4.   
  5.    Name varchar(30),  
  6.   
  7.    Age int  
  8.   
  9. )  

Now, I am going to insert some demo record in my table using while loop.

  1. declare @i int=0  
  2.   
  3. while(@i<5)  
  4.   
  5. begin  
  6.   
  7. insert NewTable values('Record',15)  
  8.   
  9. insert NewTable values('Record1',20)  
  10.   
  11. insert NewTable values('Record2',25)  
  12.   
  13. insert NewTable values('Record3',30)  
  14.   
  15. set @i = @i+1  
  16.   
  17. end  

Now let's see the record count in table.

  1. select count(*) from newTable  

Output : 20

Now write a query for common table expression. After that write a query for delete.

  1. with CTE AS(  
  2.   
  3. select row_number() over(partition by name order by name) as RowNo, Name,Age from newTable  
  4.   
  5. )  
  6.   
  7. delete from CTE where RowNo > 1  

I hope you enjoy this article.

Happy coding J
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