With the advances of the technologies for the sky surveys, massive amount of survey data become available. It would be very helpful for the automatic and semi-automatic methods in the classifications/detections of the astrophysical objects. In fact, for surveys of millions of objects, it may not be possible to detect the desired objects by expert inspection alone. Quasars are interesting astrophysical objects that have been recently discovered more comprehensively from the sky surveys. Automatic and semi-automatic methods have been proposed for the detection of the quasars from the massive data produced by the modern sky surveys. In this chapter, the first section describes about the existing automatic and semi-automatic methods for the comprehensive search of quasars. Secondly, some innovative computing algorithms are described about how to classify the light curves of the quasars against light curves of the other stars.