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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.
Let consider the given partial relation EMP. Let us make some sub-queries for them EMPNO ENAME JOB SAL DEPTNO 7566
Differentiate OO development from structured development. Structured approach of problem solving is based upon the idea of decomposition of system into subsystem. In this appro
Define physical image of a global relation at a site
Normalize the given relation to 3NF, justifying each step
Single-Valued Dependencies A database is a collection of related information and it is therefore inevitable that some items of information in the database would depend on some
Normalization :It is a process of examine the given relation schemas based on their primary key and Functional Dependencies (FDs) to achieve the properties Minimizing redun
Consider the following database containing five transactions. Let min_sup = 60%. Mine all frequent itemsets using Apriori and FP-growth algorithm. Compare the efficiency of the t
What is the max. no. Of structures that can be included in a table or structure. Nine.
what is er digram given that example of hospital,bank and library er digram.
QUESTION (a)(i) Define the term database. (ii) How is it different from a database management system? (b) What is the difference between an entity and an attribute? (c
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