T-SQL删除一半没有主键的重复项

In a T-SQL stored procedure I have a complex procedure that is comparing data using temp tables but at the end of everything when I return a single table I end up with duplicate rows. In these rows all columns in the row are EXACTLY the same and there is no primary key within this table. I need to delete only half of these based on the number of times that row occurs. For example if there are eight rows that are all the same value. I want to delete four of them.In a T-SQL stored procedure I have a complex pr