set of several fields : Unique ?

[olivier]

Hi Ruslan and list,

Not to be able to make Unique a set of several fields is an 
inconvenience with Valentina I think.

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)

Naturally, we can find solutions but "by fiddling" and by setting of 
the supplementary place on the HD.... It is pity.

thank you

Olivier