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Consider a relation s over the attributes A and B with the following characteristics:
(a) Assuming that the aforesaid index on A is unclustered, estimate the number of disk accesses needed to compute the range query σA>1000 ^ A<6000 (s).
(b) What would be the cost if the above index were clustered? Explain your reasoning.
Define the term Domain. For each n every attribute there is a set of permitted values known as the domain of that attribute.
coventions for displaying an ER schema as ER diagram
List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation
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Ancestry database records information about family trees . Following information is recorded about each person: FIRSTNAME first name SURNAME surname MNAME maiden name (if
What is NULL? Simply NULL means not in value.
please give me introduction to full data in D B M S in a short assignment
properties of derirable decomposition
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 t
Representing complex relationship among data A database may contain varieties of data interrelated to each other in numerous ways. A DBMS must have the capability to represent
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