How to delete completely duplicate rows

Question

Say i have duplicate rows in my table and well my database design is of 3rd class :-

Insert Into tblProduct (ProductId,ProductName,Description,Category) Valu         


        

Answer 1

DELETE tblProduct 
FROM tblProduct 
LEFT OUTER JOIN (
   SELECT MIN(ProductId) as ProductId, ProductName, Description, Category
   FROM tblProduct 
   GROUP BY ProductName, Description, Category
) as KeepRows ON
   tblProduct.ProductId= KeepRows.ProductId
WHERE
   KeepRows.ProductId IS NULL

Stolen from How can I remove duplicate rows?

UPDATE:

This will only work if ProductId is a Primary Key (which it is not). You are better off using @marc_s' method, but I'll leave this up in case someone using a PK comes across this post.