Introduction This demonstration presents the design of "STEAM", Purdue Boiler Makers' stream database system that allows for the processing of continuous and snap-shot queries over data streams. Specifically, the demonstration will focus on the query processing engine, "Nile". Nile extends the query processor engine of an object-relational database management system, PREDATOR [4], to process continuous queries over data streams. Nile supports extended SQL operators that handle sliding-window...