Let's have a table with the following data:

```
ID         FirstName        LastName
1          jj               ff
2          jj               hh
3          jj               ff

```

I want to delete the duplicated records only by first name and last name combined. So, the output I want should be:

```
ID         FirstName        LastName
1          jj               ff
2          jj               hh

```

How to achieve this task? 

**EDIT**

Just to illustrate more about my problem. My table contains ID field as a primary key. Therefor, the duplicated records in my case by the First Name and LastName only, that means ID not mandatory to be duplicated, as my table would never have duplicated ID. So, The delete duplicated records that I want is a bit different from the traditional delete methods which consider deleting rows when the whole row fields are duplicated.