Select function-based index data as rows in a query?



  • I'm trying to learn about indexes in Oracle 18c.

    As a novice, it's occurred to me that it might be interesting to view the actual data that's in a function-based index:

    create index sidewalk_endpoint_list_idx on my_owner.sidewalks(my_owner.endpoint_list(shape),objectid); 
    

    Is there a way to SELECT an index's data in a query?

    Fake example:

    select
        *
    from
        sidewalk_endpoint_list_idx
    

    That might be a silly question. Maybe indexes aren't stored in tables. But I thought it was worth asking, just so I can learn.



  • You can't, but you can select it from the table:

    select my_owner.endpoint_list(shape),objectid,rowid
      from my_owner.sidewalks;
    



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