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Define Join and Outer Join and differentiate between them.
Ans: Join - It generates all the combinations of tuples from two relations which satisfy a join condition. Outer Join - If there are any type of values in one table that do not have corresponding value(s) in the other, in an equi-join which will not be selected. Such rows can be forcefully selected through using the outer join. The corresponding columns for that row will comprise NULLs. There are in fact three forms of the outer-join operation: left outer join, right outer join and full outer join.
Draw an ER diagram that shows the organization of a simple student database. The database captures the information about letter grades obtained by university students who enrolled
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Define the Immediate Update The immediate update methods may apply changes to the database on disk before the transaction arrives a successful conclusion. Though, these change
You are managing the following database system: • DBMS: Oracle 11g • OS: Sun Solaris • System architecture: Web-based application using ASP.Net • Purpose of Server: HR managem
Explain Growing Phase of locking Growing Phase: In this phase the transaction can only obtain locks, but cannot release any lock. The transaction enters the growing phase as so
The physical location of a record is determined by which mathematical formula that transforms a file key into a record location? The physical location of a record is determined
Define tuple variable? Tuple variables are used for comparing two tuples in the same relation. The tuple variables are explained in the from clause by way of the as clause.
Why 'AS' clause is used in SQL ? 'As' clause is used for Rename operation. ‘AS' clause is used in SQL for rename operation. (e.g., SELECT ENO AS EMPLOYEE_NO FROM EMP)
Example -Find the employee name, salary, department number and average salary of his/her department, for those employees whose salary is more than the average salary of that depart
Express types of information available in MySQL? Information as regards the result of queries: This includes number of records affected by any SELECT or UPDATE or DELETE st
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