No, you don't have to create an index for the subclass.

To make sure, the index is being used, run the explain command on the 
select statement.
EXPLAIN SELECT FROM S WHERE name = "some name"

On Tuesday, June 4, 2013 at 7:24:16 AM UTC-7, Riccardo Tasso wrote:
>
> Hi, I have a question on (guess what?) indexes and subclasses.
>
> I have a superclass (V) with an attribute (name) and an index on that 
> attribute for that class (V.name). Now I have a subclass (S). Does the 
> following query use the index?
>
> SELECT FROM S WHERE name = "some name"
>
> Or do I have to create a new index esplicitly for S?
>
> Cheers,
>    Riccardo
>

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