  ID is derived from the word identity, derived from the first two characters
in the word. ID is used to distinguish between an entity to another entity.
Student ID (SID) is the key differentiator between a student with other
students. On the concept of database, the differentiator is unique. SID can be
numbers, letters, or a combination of both (alphanumeric). Viewed from the
daily context, it is not important to determine which a SID belongs to the type
of data. However, when reviewed on database design, determining the type of
data, including SID in this case, is important. Problems arise because there is
a contradiction between the data type viewed from the data characteristic and
practical needs. Type of data for SID is a string, if it is evaluated from the
basic concepts and its characteristic. It is acceptable because SID consists of
a set of numbers which will not be meaningful if applied arithmetic operations
like addition, subtraction, multiplication and division. But in terms of
computer organization, data representation type will determine how much data
space requirements, speed of access, and speed of operation. By considering the
constraints of space and speed on the experiments conducted, SID is better
expressed as an integer rather than a set of characters.
  KEYWORDS aphanumeric,representation, string, integer, space, speed
