Using char and varchar Data. The char and varchar data types store data composed of the following: Uppercase and lowercase characters such as a, b, and C. Numerals such as 1, 2, and 3. Special characters such as the at sign (@), ampersand (&), and exclamation point (!).
Definition of barrier for English Language Learners. : something (such as a fence or natural obstacle) that prevents or blocks movement from one place to another. : a law, rule, problem, etc., that makes something difficult or impossible.
Definition of buffer. 1  1 : any of various devices or pieces of material for reducing shock or damage due to contact. 2  2 : a means or device used as a cushion against the shock of fluctuations in business or financial activity.