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What are the technique to define a schema completely ?
A schema is completely define by DDL and DML query language.
a need some real life examples of database management systems three level of ANSI SPARC architecture life teacher and student ,company and employee or for NGO etc.
a brief definition
What is recovery management component? Ensuring durability is the responsibility of a software component of the base system known as the recovery management component.
I have to solve a problem using access
what are the main characteristics of database
Concatenation operator Example : Printing name and job as one string as column name employees: SELECT ENAME||JOB "EMPLOYEES" FROM EMP;
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
UNION If R1 and R2 are two union compatible relations then R3 = R1 ∪ R2 is the relation having tuples that are either in R1 or in R2 or in both. In case, R3 will have tuples
Improved availability: The data in a distributed system may be replicated so that it is at more than one site. Thus, the failure of a node or a communication link does not necessar
Define Specialisation and generalization in brief? Specialisation / generalization: Generalization or Specialization represents the is a relationship set, an necessary element
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