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Insulation between conceptual and physical structures
It can be defined as:
1. The Database Administrator should be capable to vary the storage structures without affecting users' views.
2. The internal structure of the database should be unaffected by the varies to the physical aspects of the storage, like changing to a new storage device.
3. The DBA should be able to vary the conceptual structure of the database without affecting all users.
Some disadvantages of File Oriented System ?
what is object-identity
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Differance between internal and external schema? Internal and external schema: Internal Schema • Describes the physical storage structure • Uses a physical data model External
In Database software have only pure security or some dis secured by administrator?
When a function module is activated syntax checking is performed automatically. YEs, a function module is activated syntax checking.
data models are being replaced over years. Reasons and why does that happen?
Write an sql statement to find what is the percentage of home policies which are from the state of Arizona out of all Home policies by Policy Value.
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