set of several fields : Unique ?

[olivier]

>> e.g. I have a database (fields: street, zip, city) for 3 000 000 of 
>> the
>> streets.
>>
>> All these streets must be unique.
>> But Unique in every city. ( it can have identical street names but in
>> different cities there)
>
> To set UNIQUE flag on combination of several fields
>     you need simply to use BaseObject Method.
>

yes, but I shall have a big file of index (name+zip+city X 3 000 000).

thank you

olivier