>>This is normal. Random numbers are not unique.
>>
>>Each time you generate a new number you must do a SEEK and add it only if it is not already in your table.
>>
>>Vlad
>>
>>>I fill a file having 12000 records with 'random' numbers. Index on number unique
>>>shows only 7550 unique numbers
>>>
>>>>What's the problem? Ie: What doesn't work?
>>>>
>>>>Vlad
>>>>
>>>>>We are using RAND() to create a random sampling of a phone number file so
>>>>>we need unique numbers so we don't re-use phone numbers
>>>>>
>>>>>Any way?
>
>In addition to check to be sure that the number is indeed unique, has Vlad has said, you might also want to call RAND(-1). This will use the system clock as the seed. I have found that you are far less likely to get a repeat.
>-Ed

However, if you are doing a series of these programmatically, you may have a problem with the system clock not updating fast enough. Note in the Help it says to issue Rand() with a negative number first, then Rand() with no parameter.

HTH
Barbara