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Dbms
1. DBMS:DATA BASED MGMT SYSTEM, is used to store data related to any businss porcess supported by
an info system
Eg: data related 2 banking appl;ication, employee mgmt system,airline n rail reservation etc.
well knwn DBMS softwares are Oracle,MS.SQL server,IBM DB/2,Sybase,my SQL,MS Acess
The data is stored in the form of tables each table must be designed by specifing column name data
type& data size
Eg: Student details- name , rollno.course, year of admit etc .
PRIMARY KEY :
A column or set of columns which uniquely identify a row in a table are known as primary key,
There can be one n only primary key in a table.
Eg: Vehicle reg.No, Bank A/c NO, PNR No. etc ..
Importance :
Primary keys cloumns must not be NULL (Cannot be blank shud hve some value)n shud be Unique !!
Table consists of several cloumns n rows
A database is a collection of logically related tables