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What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
external and internal mapping with examples
What is the difference between SQL Server 2000 complete and differential backups? A complete backup makes a copy of the whole database. A differential backup creates a copy of
Explanation on Data Sharing?
Which component is not included in database environment ? A users component is not included in database environment.
Explain the conventions (relationships) for displaying an ER schema as an ER diagram.
What are the advantages of by using an index and what are its disadvantages ? In difference, if the search key of a secondary index is not a candidate key, it is not sufficient
Explain Clustering file organization (i) Determine if a record of file is physically ordered on a nonkey field - that does not comprise a different value for each record - that
Consider a table student (std_id, std_name, date_of_birth, percent_marks, dept_name). Write a QBE query to display names of Computer Science department students who have scored mo
In the ER diagram, one example of subclassing is depicted following the Services entity. The subclasses Item Based and Time Based are created. The entity Services gains the attribu
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