FUZZY JOIN KEY

A system includes identification of a first one or more columns of a first database table as associated with a first entity and a first one or more columns of a second database table as associated with the first entity, mapping of the data of each row of the first one or more columns of the first database table to respective first rows of a predetermined schema associated with the entity, mapping of the data of each row of the first one or more columns of the second database table to respective second rows of the predetermined schema associated with the entity, determining of matching ones of the first rows and the second rows, and based on the matching ones of the first rows and the second rows, identification of the first one or more columns of the first database table and the first one or more columns of the second database table as a JOIN key between the first database table and the second database table.