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CHAR(length): Oracle DBMS fixed-length character string. Typically used for string columns which are less than 20 characters in length. Always used for string columns that are indexed, regardless of length. length denotes the maximum number of characters the string can contain.
NUMBER(10): Oracle DBMS integer number, maximum 10 digits. The standard datatype used for most integers.
NUMBER(precision,0): Oracle DBMS integer number with a maximum of precision digits. Used only for integers which may exceed 10 digits and the "next number" columns in the msv* tables.