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 fence. 1  1 archaic : a means of protection : defense. 2  2a : a barrier intended to prevent escape or intrusion or to mark a boundary; especially : such a barrier made of posts and wire or boardsb : an immaterial barrier or boundary line on the other side of the fence in the argument. 3  3 : fencing  1.