The emergence of ambient computing introduces wireless and portable technologies that democratize access to information and data through services and thereby opens new research challenges for data querying. The most popular method to access data within these novel dynamic execution environments in a convenient and efficient way is still to consider declarative queries. Such queries, so-called hybrid queries may involve streaming and on demand data originated from services, possibly with temporal and mobile properties. For evaluating these queries we propose the HYPATIA system that tacles two main issues (i) using service coordination for building query plans and (ii) efficient and flexible evaluation capabilities.