> Hi @Iryna Mykhailova and welcome to the Tutorials Contest.

Why, thank you wink

Both %SQLQuery and %Query are class queries. As for the Studio - I do believe it's the easiest way for people who start working with IRIS to get acquainted with the technology!

You are right, I forgot to keep in mind that I have a parameter for the second example. I will correct it to reflect that I'm looking for people older than the exact age. Thanks for the heads-up!

Yes, that's what I did (because, obviously, the class being abstract is not the cause - works great in other scenarios):

Class Test.NewClass Extends %Persistent [ Abstract, NoExtent ]
{}

Class Test.NewClass1 Extends Test.NewClass
{}

I do know you don't inherit all from the secondary class, but I though the number of things I do inherit was more than just parameters, properties and methods. I take it queries, foreign keys, triggers, projections are out as well?