For what I can understand you probably want something like this
Symfony2 Select one column in doctrineSymfony2 Select one column in doctrine
but I can not really understand what exact data structure you want to get, and to which query in your controller you are referring to.
Is theres a way to get only those data i need not all data from all other tables combined by keys??
also do not understand because these queries will return you object with properties not arrays with keys. Moreover by default doctrine won't fetch all data only single row, and only when you access method will ask db for more data.