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.
boundary. [ 1 bounâ²dÉrÄ] ( 2 in psychology) an aspect of family health in which the generations are clearly defined and issues are dealt with by the appropriate generation. There are also limits between the family turf  and the larger society.