>< SNIP >
>
>>For 50000 records the results are:
>>Method 1: 0.423
>>Method 2: 1.556
>>Method 3: 0.904
>>Method 4: 0.531
>>
>>For 100000 records the results are:
>>Method 1: 0.800
>>Method 2: 3.707
>>Method 3: 1.803
>>Method 4: 2.277
>>
>>For 200000 records the results are:
>>Method 1: 2.094
>>Method 2: 100.774 && Very strange
>>Method 3: 6.592
>>Method 4: 4.155
>
>SET TALK OFF set safety off
>*For 50000 records the results are:
>*Method 1: 0.271
>*Method 2: 0.491
>*Method 3: 0.471
>*Method 4: 0.321
>
>*For 100000 records the results are:
>*Method 1: 0.511
>*Method 2: 1.302
>*Method 3: 0.961
>*Method 4: 0.571
>
>*For 200000 records the results are:
>*Method 1: 0.942
>*Method 2: 5.738
>*Method 3: 1.932
>*Method 4: 1.111
>
>*For less than 10,000 the result is:
>*Method 1: 0.000 *
>*Method 2: 0.130
>*Method 3: 0.080
>*Method 4: 0.090
>
>And the winner is : Meth1 - Dele All, Ind Unique, Recall All
>Runner up : Meth4 - Sele into Cur, Append
>
>Why is method4 slower than Scan in Scan or Do While?

Actually, your tests confirmed mine and showed, that method 4 is a little bit faster, than method 3. I already excluded method 2 (scanning the whole table) from consideration, because it's the slowest method. So, if you need to choose between 1 and either 3 or 4, I would choose method 1, if:
1) You don't have deleted records in a table (e.g. just did pack)
2) It doesn't matter, which "unique" record should be left in a table.

As I noted in the bottom of my FAQ methods 3 & 4 could be modified to add some logic, which record we want to be remained in a table. I didn't add a code in a FAQ in order to not complicate it.