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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;
Differentiate sub-class and super-class? The specialization of a class is known as subclasses.eg: employee is a subclass of person and teller is a subclass of employee. Convers
What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
One-to-one relationship: For every 1:1 relationship type R in the ER diagram including two entities E1 and E2 we take one of entities (say E1) preferably with total participatio
(a) Why did SAP introduce the extended star schema?
how to construct labelled precedence graph for view serialiability.please explain insteps with one solved examples
I need web security expert , website management Project Description: i want professional for the below . website management server management database management
Draw the precedence graph of the following schedule and determine whether the schedule is serializable. (Note that all instructions, except lock and unlock, are omitted. We assume
What is Normalization? Database normalization is a data design and organization method applied to data structures based on rules that help building relational databases. In rel
What are referential integrity constraints? A value that appears in single relation for a given set of attributes also appears for a particular set of attributes in another rel
entity relationship diagram about finance
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