A ‘Data Item’ refers to a single unit of values. E.g. Roll Number, Name, Date of Birth, Age etc.
There are two types of data items. These are-
1. Group Items
2. Elementary Items
1. Group Items-
Data items that can be divided into sub-items are called ‘Group Items’.
E.g. the name of a person is a group item because it can be divided
into three sub-items: First Name, Middle Initial and Last Name. Other
examples are: Address, Date, Qualification, Salary etc.
2. Elementary Items-
Data items that cannot be divided into sub-items are called ‘Elementary
Items’. E.g. the roll number of a student is an elementary item because
it cannot be divided further into sub-items. Other examples are: Marks,
Age etc.