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Database Errors:An error is said to have occurred if the implementation of a command to manipulate the database cannot be successfully finished either due to inconsistent data or because of state of program. For instance, there may be a command in program to kept data in database. On the implementation of command, it is found that there is no place / space in database to accommodate that additional data. Then it can be said that an error has happened. This error is because of the physical state of database storage.
Single Valued Normalisation Codd in the year 1972 formed three normal forms (1NF, 2NF, and 3NF). These were based on functional dependencies between the attributes of a relati
Give Concurrent sub states diagram for the classroom and exam held. In Figure, simultaneous substrates have been taken. After passing Minor 1 test you could give Minor 2 test. T
Which operation is used if we are interested in only certain columns of a table? PROJECTION operation is used if we are interested in only certain columns of a table.
What are the benefits of OOA technology? Using OOA technology can produce many benefits, such as: i) Reusability of code ii) Productivity is gained through direct mappi
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
Define DBA database administrator? DBA : A database administrator (DBA) is a person who is responsible for the environmental aspects of a database. In common, these involves:
Removing a Synonym: DROP SYNONYM D30;
What is relationship instance ? Relationship Instance - A relationship is a relation between two or more entities. An instance of relationship set is a set of relationships.
Draw the precedence graph of the following schedule and determine whether the schedule is serializable. (Note that all instructions, except lock and unlock, are omitted. We assume
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