Data an important concept everywhere.Nothing exist without data.If we need to compute anything we need data.If we need to determine any result,we need data.So data is base for all the computing and we this world of computing can't exist without data.
What is data in terms of computers, at the lowest level data is stored in the computers in the form of bits which can be either 0 or 1.So anything which is stored in computers is in the form of bits.For ex 0111000111000 is a data which is stored in computers.
So we can explaining the hierarchy of data in computers:
1)Bits:It is the smallest data item in the computers.
2)Characters:It is very tedious to work with bits for a human,since we cannot remember all data in the form of 0 or 1.Instead of this we are able to remember patterns in the form of characters.So the decimal digits(0-9),letters(a-z and A-Z) and special symbols (@,#,$,%,^,&,*,? etc) are known as characters.Java uses Unicode characters that are composed of 1,2 or 4 bytes.THese Unicode characters contains characters from many languages of world.
3)Fields:Just as characters are composed of bits,fields are composed of characters or bytes.So a field can contain a sequence of characters or bytes that can convey some meaning.For ex "Abhishek" is a field which is representing a name,"23" is a field which can be the age of anyone or a number.
4)Records:Records can contain several fields i.e. when we group some records then it can compose a record.For Ex suppose we have some fields such as name,age,address etc and if wegroup together all these fields then it can be called a record.
So i have a question, can you identify record in Java?
Yes you are right,Classes in Java can be called as records.In above example record can be called as Person which is having fields such as name,age, address etc.
5)Files:Some records can be combined to form a file.But more generally a file can contain arbitrary formats such as in some operating systems,a file is viewed as a sequence of bytes.So we can say files as organization of data into records is a specific view whic is created by application programmer.
6)Database:In early days data was organized in the form of files, but as soon as the size of the files increases,we felt a need for something which can organize those files.So there is database.A database is a collection of data organized for easy access to data and for its manipulation.Now a days most popular database is relational database in which data is stored in form of tables.
7)Big Data:Now a days the amount of data produced is very huge and it is growing quickly.So to deal this enormous size of data,we have Big Data applications which deals with this huge amount of data.This data hierarchy is new and it is evolving at a great rate.
What is data in terms of computers, at the lowest level data is stored in the computers in the form of bits which can be either 0 or 1.So anything which is stored in computers is in the form of bits.For ex 0111000111000 is a data which is stored in computers.
So we can explaining the hierarchy of data in computers:
1)Bits:It is the smallest data item in the computers.
2)Characters:It is very tedious to work with bits for a human,since we cannot remember all data in the form of 0 or 1.Instead of this we are able to remember patterns in the form of characters.So the decimal digits(0-9),letters(a-z and A-Z) and special symbols (@,#,$,%,^,&,*,? etc) are known as characters.Java uses Unicode characters that are composed of 1,2 or 4 bytes.THese Unicode characters contains characters from many languages of world.
3)Fields:Just as characters are composed of bits,fields are composed of characters or bytes.So a field can contain a sequence of characters or bytes that can convey some meaning.For ex "Abhishek" is a field which is representing a name,"23" is a field which can be the age of anyone or a number.
4)Records:Records can contain several fields i.e. when we group some records then it can compose a record.For Ex suppose we have some fields such as name,age,address etc and if wegroup together all these fields then it can be called a record.
So i have a question, can you identify record in Java?
Yes you are right,Classes in Java can be called as records.In above example record can be called as Person which is having fields such as name,age, address etc.
5)Files:Some records can be combined to form a file.But more generally a file can contain arbitrary formats such as in some operating systems,a file is viewed as a sequence of bytes.So we can say files as organization of data into records is a specific view whic is created by application programmer.
6)Database:In early days data was organized in the form of files, but as soon as the size of the files increases,we felt a need for something which can organize those files.So there is database.A database is a collection of data organized for easy access to data and for its manipulation.Now a days most popular database is relational database in which data is stored in form of tables.
7)Big Data:Now a days the amount of data produced is very huge and it is growing quickly.So to deal this enormous size of data,we have Big Data applications which deals with this huge amount of data.This data hierarchy is new and it is evolving at a great rate.
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