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Describe queries with complex types?
The present extension of the SQL query language deal with the complex type
Let us start with the simple example:
Find the title and the name of the publisher of each book this query carries out the task:
Select title, publisher.name
From books
path expression
The reference are dereference in 1999 by the -> simple
Select head-> name, head->address
From dept
An expression such as" head->name" is called the path expression.
Collection valued attributes
Nesting and unnesting
The transformation of the nested relation in to a form with fewer (or no) the relation -valued attribute value is known as unnesting
The reverse process of transformation a INF relation into a nested relation is known as nesting.
An instance of relational schema R (A, B, C) has distinct values of A including NULL values. then A is a candidate key or not? If relational schema R (A, B, C) has distinct val
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What is completeness constraint on generalization? Define the variation between total and partial design constraint. Give an example each. Ans: Completeness Constraints
One-to-many : An entity in A is related with any number of entities in B. An entity in B is related with at the most one entity in A. Example: Relationship between faculty and d
i need to submit in this topic.
What is Nested Trigger? A trigger can also having INSERT, UPDATE and DELETE logic within itself, so when the trigger is fired because of data modification it can also cause ano
Java program for horrizontal fragmentation in distributed database
Consider the subsequent relations for a database which keeps track of business trips of salespersons in a sales office: SALESPERSON (SSN, Name, start_year, Dept_no) TRIP (SSN, Fr
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