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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.
DISADVANTAGES OF RDBMS
Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational mo
What is NULL? Simply NULL means not in value.
what is union compatable?
Define- relational algebra. The relational algebra is a procedural query language. It having of a set of operations that take one or two relation as input and make a new relati
What is meant by log-based recovery? The most widely used structures for recording database changes is the log. The log is a sequence of log records, recording all the update a
Attributes having a one value for a particular entity. For instance, Age is a single valued attribute of a student entity. Attributes that have more than single values
explain thee diffrent types of data models
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
Need a sample of a clinic database relationships
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