5.4.4 Basic Domains Supported by ORACLE
We review briefly a few of the more important domains supported by ORACLE: • In ORACLE, char[(n)] represents variable strings of characters of length n, where 1 ≤ n ≤ 32767; the default value of n is 1. The domain character is the same as char. The characters and their order are determined by the system during the installation of the DBMS. The domain varchar(n) requires n to be specified and also represents variable-length strings of characters. It is the intention of ORACLE to separate char(n) from varchar(n) in future releases: char(n) will represent fixed-length strings while varchar(n) will represent variable-length strings.