A non-volatile memory device is able to enhance data integrity using threshold voltage recalibration based on a selected scheme. A new query form, called a composite join, takes a user-supplied query including one or more terms optionally joined by logical operations, an identification of two or more tables and an identification of a common join key shared across the tables. For example, the polymer molecules may be arranged in a non-aligned, electronically-communicative manner, stabilized by various methods such as chemical linkages or physical interactions.