1. A method of updating a product database, comprising: providing a database comprising a plurality of database entries, wherein each database entry comprises a classification field and a plurality of additional fields, wherein the classification field comprises a classification of an item of the database entry; providing data associated with a product item for adding to the database as a new entry; generating a query from the data associated with the product; computing a correlation value of the query with information saved in at least one selected field of a database entry, wherein computing is repeated for at least part of the plurality of database entries; identifying database entries including information in the at least one selected field, which has a correlation value greater than a predetermined value; determining the most popular classification among classifications saved in the classification fields of the identified database entries; and assigning the most popular classification to the classification field of the new entry.