The present invention relates to an apparatus and method for executing a query, and a system for processing data by using the same. The apparatus for executing a query includes: a processor receiving a query and returning a result value; and a storage storing data on the query. The storage includes: a first storage temporarily storing data required for the execution of the query; and a second storage constructing a DB and storing data, and the processor combines a plurality of primitives in the query to configure a composite primitive, generates a binary code for the composite primitive in run time, and executes a generated code.