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What do you mean by Correlated subquery?Subqueries, or nested queries, are used to bring back a set of rows to be used by the parent query. Depending on how the subquery is written, it can be implemented once for the parent query or it can be implemented once for everyrow returned by the parent query. If the subquery is implemented for each row of the parent, this is known as correlated subquery.
In E-R Diagram how relationship type is represented ? In E-R Diagram relationship type is represented as a Diamond.
Define physical image of a global relation at a site
Differentiate between horizontal & mixed horizontal fragmentation?
What are composite objects? Objects that have other objects are known as complex objects or composite objects.
what problems are raised by the database? why is it so controversial? why is data quality an issue?
What are the various forms of data transparency? a) fragmentation transparency b) replication transparency c) location transparency
Consider the ER schema below for the MoneyMaking supermarket chain problem. Translate the given ER schema into SQL CREATE TABLE statement.
You group has been hired by TrainingrUs.com to keeps track of training revenues. TrainingrUS.com wants you to keep scheduling. COURSE table contains following information:
It defines that no primary key value can be null. This is as the primary key is used to recognize individual tuple in the relation. So we will not be able to recognize the records
Problem: ‘Users and Information system specialists need to spend inordinate amounts of time locating and gathering data' (Watson and Hal, 1998) Recent developments in the ar
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