learn how to create table in database.
While creating table important thing is Table name along with column name with data type. Practical example given in this video.
CHAR is data-type actually, IMP data type while creating tables are CHAR, VARCHAR2, DATE, NUMBER etc. I said CHAR is not datatype it is column type actually it is datatype.
#Constraint : IMP topic of Oracle Database.
Learn how to create table with constraint
Check Constraint details in Oracle.