Thanks Hilmar, that is clear.
>><snip>
>>>Note that "special" is a field, not the index. In other words, it doesn't ? > >matter if Table1 is indexed or not.
>>
>>Do you mean, I can set a relation without indexing if it's a field, I didn't know hat?
>
>Yes. Basically, the SET RELATION is always:
>
from an expression - usually, this will be a field. But never an index. Of course, you may happen to have an index by the same name as a field - but this is not relevant. The "from" table can be unsorted, or ordered by any index. This will affect the sorting order, but not the relation.
>into a table. The table must (usually) have an active index that matches the expression which I mentioned in the previous paragraph.
