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What are the various properties of Relational tables?
Relational tables have 6 properties:
1. Each row is unique.
2. Column values are of the same kind.
3. Values are atomic.
4. Sequence of columns is insignificant.
5. Sequence of rows is insignificant.
6. Each column should have a unique name.
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The indices are accumulated in the index files. The data is accumulated in the data files. Indices give fast access to data items. For example, a book database may be managed in th
i am not clear with the climetic condition of the north indian plain. can u plz explain it for me
what are the reasons having variable length records
Consider the subsequent relation schemes: Project (Project#, Project_name, chief_architect) Employee (Emp#, Empname) Assigned_To (Project#, Emp#) Give expression i
If the insertion violates one or more constraints, then two alternatives are available: Default option: - Insertion can be discarded and the reason of refusal can also be ex
The issues relating to the Design of the Physical Database Files Physical File is a file as stored on the disk. The major issues relating to physical files are: • Cons
Design a generalization–specialization hierarchy for a motor-vehicle sales company. The company sells motorcycles, passenger cars, vans, and buses. Justify your placement of attrib
multidimensional data model
What is the difference between serial and sequential files? How searching is applied on both? Ans: A serial file is one where the records have been stored in the order where
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