It is often necessary to specify the maximum size of a field. Each text field contains one or more characters. 0 is the smallest 8 digit binary number. 3D 1 byte. A byte is the standard measure of computer storage.
Numerical information is stored as numbers.
8 bytes to store a number. Dates and times are stored as numbers in one of two ways. The old method expresses the date in yymmdd.hhmmss format. The date is the number of days since 1 January 1900. The time is the fraction of the day.