We consider how to support interactive querying over webscale data. The basic approach is to view querying as a two-phase activity: first supply a query template, and later supply specific instantiations of the template. Interactive responsiveness is offered in the second phase only. While instances of this problem have been studied in the past, e.g., OLAP and web search, we pursue a more general formulation. Our aim is to build a general two-phase query system.