Technical Interview Questions and Answers :: Virtusa
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1. Redundant Data
2. Inconsistency
3. Not easy to access data.
4. No security
5. Concurrent access is not allowed.
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Physical Level - This is the lowest level of data abstraction which describes which describes how the data is to be stored in the database.
Logical level - The level describes the data in the database as well as relations between these database.
View Level- This is the highest level of data abstraction , only some part of actual database is viewed to the user.
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There are two Integrity rules.
> Entity Integrity: States that “Primary key cannot have NULL valueâ€
> Referential Integrity: States that “Foreign Key can be either a NULL value or should be Primary Key value of other relation.
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Please Login First :
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Application software and system software.
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white box testing is another name of glass box testing. it is a error correcting
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