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 wall for Students. 1 : one of the sides of a room or building. 2 : a solid structure (as of stone) built to enclose or shut off a space The property is surrounded by a brick wall. 3 : something that separates one thing from another a wall of mountains. 4 : a layer of material enclosing space the heart wall the wall of a pipe.