Statistical query pricing model, system and equipment based on fine-grained randomization mechanism

The invention provides a statistical query pricing model, system and device based on a fine granularity randomization mechanism, belongs to the technical field of data pricing, and aims to realize fine granularity and save computing resources, and the statistical query pricing model executes the following steps: receiving a data set sent by a data providing end and corresponding preset joint distribution; in response to a data service request sent by a service request end, determining a requested target sharing column, and determining a corresponding statistical query function and noise variance; based on preset joint distribution, the value range of the secret parameter, the target shared column and the query type of the statistical query function, determining the association degree between the query result of the statistical query function and the secret parameter; based on the correlation degree, a preset weight parameter corresponding to the secret parameter and the noise variance, determining a compensat