Question

I am working on Oracle. I have this large property-indexer table (THE_TABLE), whose columns are

[ObjectID | CategoryID | Property1 | Property2 | ... | PropertyN]

where N is known by design. All the Property% columns are VARCHAR2 of the same size, the ObjectID is Numeric. Now, I would like to create a materialized view that contains the results of the following queries:

select distinct CategoryID, (select 'Property1' from dual) as PropertyName, Property1 as PropertyValue from THE_TABLE

select distinct CategoryID, (select 'Property2' from dual) as PropertyName, Property2 as PropertyValue from THE_TABLE

...

select distinct CategoryID, (select 'PropertyN' from dual) as PropertyName, PropertyN as PropertyValue from THE_TABLE

In other words, the view (THE_VIEW) should contain three columns:

[CategoryID | PropertyName | PropertyValue]

and be able to return the unique values linked to a specific CategoryID. Is there a way to create such a view?

Please note that I do not have the possibility to modify THE_TABLE.

Regards,
Andrea

Answer 1

I am not sufe if I understand your question correctly, but I believe you want something like

create materialied view THE_VIEW as
  select categoryID, 'property1' propertyName, property1 propertyValue from THE_TABLE union all
  select categoryID, 'property2' propertyName, property2 propertyValue from THE_TABLE union all
     ...
  select categoryID, 'propertyN' propertyName, propertyN propertyValue from THE_TABLE
;