I'm not entirely sure I understand the question. You can change the structure of the original table if it is opened exclusively (therefore it cannot be open anywhere else whatever the alias name is).

Yes when you use with alias it does open the original table just with a different name.

>Select can take long time and I have to reindex the cursot.
>Why can't I use with alias?
>I have a impression that when I use with alias I use with the original table but with other name, my right?
>If so I must get your suggestions.
>Thank you