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A computer file can be defined as a block of arbitrary information or resources used to store information that is available to the computer program which is usually based on some kind of durable storage
Types of Computer File
1.)Data File: It is used to store data
2.)Text File: It is used to store document or text.
3.)Program File: It is used to store computer instruction.
Definition of Terms used in Computer File
1.) Character: This is the smallest element of file which can be either letter,number or special characters.
2.) Field: This is the collection of characters or bytes that makes up a single fact or unit of information called Data Item. It is also known as Data Field.
3.)Record: This can be defined as the collection of related field or data item.
4.)Computer File: This can be defined as the collection of related record.
5.) Database: This is the collection of related file. File are usually integrated in database using database management system e.g Microsoft Access, Oracle etc
5.)Key field:This is used for identify record so that it can locate and process it.
Types of Key field
There are there different types of key field and they are:
i.)Primary key field: This type of field is unique i.e Only one of it exist. It is also known as 10 key field e.g Matric Number , Admission Number, Registration Number of students.
ii.) Secondary Key field: This is also known as 20. Example is Department.
iii.) Tertiary Key field: This is also known as 30. Example is Faculty.
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