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What is Data dictionary?
A data dictionary is a reserved space in a database that is employed to store information about the database itself.
A data dictionary may consist of information like:
a)Database design information
b)Stored SQL procedures
c)User permissions
d)User statistics
e)Database process information
f)Database growth statistics
g)Database performance statistics
what is physical data structure
Define the Division Operation of Relational Algebra Let R be a relation comprising attributes (A1,...Ap,Ap+1,...An) and S comprising attributes (Ap+1,...An) DEF: Division
education.
1. Staff (staffID --> availabilityID) 2. Services (servicesID --> itemBasedID --> timedBasedID) 3. TimedBased (timedbasedID--> priceid) 4. Clients (clientId, serviceId-->
The Maximum no of key fields that can be used in a header is?? 50
explain equi-join using illustration
Explain briefly concurrent task by taking an example. Concurrent Task- The concurrent occurrence of more than one event is called concurrent task. Operating systems can handl
What are the different integrity constraints in RDBMS? The various integrity constraints in RDBMS are as: Primary Key: primary key is a grouping of one or more attributes
What is Derived and stored Attribute? Derived and Stored Attribute - In a few cases, two or more attribute values are associated, for example, Age and BirthDate attributes of a
what should be included in this???
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