As in previous post we made dependent lov in af form , now let us try this in af query component.
Expand the datacontrol and drop it as query with table component.
If you run the application it will not work.
Since there is no attribute level accessibility in af query component , we need to set the partial trigger sort of stuff at view object level.
Double click state attribute and select dependent on countryid.
Run the application and it will be working like charm.