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1 - Serial RS232 comm port comunication 2 - NanoHTTPD serving a few processed pages 3 - System tray application to indicate status and access configuration forms 4 - SQLit
How to reduce data redundency
Eliminate Columns Not Dependent On Key The Employee Relation satisfies - First normal form - As it has no repeating groups. Second normal form - As it do not have multi-a
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
what is union compatable?
Explain mechanism of nested queries? SQL gives a mechanism for nesting subqueries. A subquery is a select from where expression that is nested within one more query. A common u
What are the situations while DBMS should not be used? DBMS should not be used in situations like: (i) No need of security. (ii) Not difficulty to access the data (iii) N
Difference between Operating System and Database Security Security within the operating system can be executed at various levels ranging from passwords for access to system, t
Logical Operators Rules of Precedence: Order evaluated Operator 1 All comparison operators 2
Example RELATION SCHEMA for STUDENT: STUDENT (Roll No: string, name: string, login: string, age: integer) RELATION INSTANCE
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