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Reflects organisational structure:Many organizations are distributed over various locations. If an organisation has many offices in dissimilar cities, databases used in such an application are circulated over these locations. Such an organisation may stay a database at every branch office having details of the staff that work at that location, the local properties that are for rent, etc. The staff at a branch office will create local inquiries to such data of the database. The company headquarters may wish to create global inquiries involving the access of data at each or a number of branches.
What do you understand by transitive dependencies? Define with an example any two problems that can take place in the database if transitive dependencies are available in the datab
Although, the essential features of E-R diagrams are enough to design many database situations. Though, with more difficult relations and advanced database applications, it is need
UNION If R1 and R2 are two union compatible relations then R3 = R1 ∪ R2 is the relation having tuples that are either in R1 or in R2 or in both. In case, R3 will have tuples
Hot Backup: Some sites cannot terminate the database while creating a backup copy of the files. The cold backup is not a reliable option. So different kinds of backing up database
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 multivalued dependency
What is a value? A data value is used for identity. This form of identity is used in relational systems.eg: The primary key value of a tuple recognize the tuple.
You have a friend that runs a motor bike club that holds racing events at various venues on weekends, on a monthly basis. Some venues are private race tracks and some are dirt trac
Describe entity referential integrity and integrity. Give an example of each. Entity Integrity Rule - If there is a attribute A of relation R is a prime attribute of R then A
i need to implememnt a treee based mining algorithm. do you have an expert that can do that?
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