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Insertion Anomaly: Inability to show certain information-The primary key of the over relation be (enrolment number, Cno). Any new tuple to be inserted in the relation should have a value for the primary key as entity integrity constraint needs that a key may not be totally or partially NULL. Though, in the given relation if one required inserting the number and name of a new course in the database, it would not be feasible until a student enrols in that course. Likewise information about a new student cannot be inserted in the database unless the student enrols in a course. These problems are known as insertion anomalies.
Problem: (a) Data mining is one of the best ways to analyse data and using software techniques, hidden and unexpected patterns and relationships in sets of data can be extrac
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
Rearrange the Execution Order for Efficiency Rearranging execution order for efficiency means executing such job that requires less execution time. By rearranging the object
Relational Model: The relational model uses a collection of tables to represent both data and the relationships among those data. Each table has multiple columns and each column h
What is the use of unique function? UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
We will explain here an example database application having COLLEGE database and use it in showing several E-R modelling concepts. College database remains track of faculty, Stu
Define hot swapping? Hot swapping permits the removal of faulty disks and changes it by new ones without turning power off. Hot swapping decreases the mean time to repair.
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What is SQL Profiler? SQL Profiler is a graphical tool that permits system administrators to monitor events in an instance of Microsoft SQL Server. You can capture and save dat
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