Databases

                                                                    Databases


                                     Key Words:

                                     Serial File: A file of items one after another
                                     Sequential File: A serial file in order
                                     Entity: Something that we store data about in a database
                                     Record: All the data about one item in a database
                                     Attribute: A characteristic of an entity. It becomes a field in a data table
                                     Field: A characteristic of something stored in a database
                                     Indexed sequential file: A sequential file that is accessed using an index, 
                                     which is a separate file.
                                     Flat File Database: Database consisting of only one table
                                     Primary Key: A primary key is a unique value so hat a record in the table
                                     can be identified without any mistake.


    A database is an organized collection of data. The data are normally organized to model relevant aspects of reality in a way that supports processes requiring this information. For example, modelling the availability of rooms in hotels in a way that supports finding a hotel with vacancies.