The source for the conducting 2D electron gas (2DEG) at the interface between SrTiO₃-LaAlO₃ is still under heavy debate and the exact properties of its metallic state are still largely unknown. We report transport measurements, including: Hall, Seebeck and Nernst Effect. All these transport properties exhibit anomalous field and temperature dependence. In particular, the large magnitude of the Nernst signal and its shape cannot be explained by a conventional single carrier model. We analyzed the data assuming multiple types of carrier. We were able to reconcile the low temperature behavior of all transport properties using a two band analysis.