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What is a view? Make a view of EMP table named DEPT 20, to display the employees in department 20 and their annual salary.
Ans: View is a virtual table that does not consists of it own data it fetch the data from the original table.
Create view DEPT20 as select * from dept;
Where dno=20 group by dno;
Define granularity, hierarchy of granularity of locks & multiple granularity locking. Explain the modified two phase locking along with multiple granularity locking. Ans: The s
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Using the concepts defined previous, we have identified that strong entities in COLLEGE database are FACULTY, STUDENT, COURSE and DEPARTMENT. This database also has one weak entity
Which of the operations constitute a basic set of operations for manipulating relational data? Relational algebra operations constitute a basic set of operations for manipulati
3 assignments combined in 1
These are interactive interfaces, graphical that hide the difficulty of the DBMS and query language behind an intuitive, simple to understand, and convenient interface. This permit
What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.
How nulls are treated in comparison operator? Along with comparison (relational) operators, the null values are ignored as we cannot derive the relation along with the given op
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