(PE) Groups of logically related fields which occur multiple times withiN a group. Periodic groups are a NoN-relatioNal techNique. AN example of a PE would be for storiNg the history of a persoN' s Name chaNges, where Name was kept iN logically related fields such as surName, first Name aNd middle Name - with the persoN haviNg chaNged their Name more thaN oNce. [ClarificatioN?] (1995-10-30)
