1. A method for managing multiple subsets of data stored in a database, comprising: storing a superset of sampling data as a plurality of data records, the superset including a plurality of sampling interval data sets, each sampling interval data set including sampling data corresponding to a first time interval of a first time length where the superset includes sampling data for a plurality of sequential time intervals; sampling the sampling data in the superset over a second time interval of a second time length which is a multiple of the first time length to generate information identifying a subset of data for the superset, wherein the sampling creates a second sampling level associated with the subset of data that is identified, wherein the second sampling level includes a plurality of second time intervals; sampling data of the subset of data that is identified over a third time interval of a third time length which is a multiple of the second time length to generate information identifying a second subset of data from the superset; and assigning a code to each data record of the plurality of data records in the superset wherein the code identifies a highest sampling level with which each data record is associated.