1. A method of storing schema-less data of a dataset in a relational database, said method comprising: creating a hashtable for said schema-less data, using a processor on a computer, wherein: data in said dataset is stored in a tuple format comprising a subject along with at least one other entity associated to said subject; each row of said hashtable will be dedicated to a subject of said dataset; and at least one of said at least one other entity associated with said subject in said row is to be stored in a pair-wise manner in that row of said hashtable.