Compound and natural key
Explain the alternate, partial, artificial, compound and natural key.
Expert
It refers to a set of attributes which uniquely recognize the weak entities and which are related to the same owner entity. It is sometime known as the Discriminator.
Alternate Key:
All the Candidate Keys excluding Primary Key are termed as the Alternate Keys.
Artificial Key:
If no obvious key either stands alone or compound is available, then last resort is to simply form a key, by allocating a unique number to every record or the occurrence. Then this is termed as developing an artificial key.
Compound Key:
If no single data element uniquely recognizes occurrences within a construct, then joining the multiple components to develop a unique identifier for construct is called as developing a compound key.
Natural Key:
When one of the data components stored within the construct is used as the primary key, then it is known as the natural key.
Explain the several security levels provided by the WTLS?
If total of 33 MHz of bandwidth is assigned to the certain cellular system that uses two 25 KHz Simplex channels in order to offer the full Duplex voice. Calculate number of channels that are available per cell if the system uses:
Explain the benefits of the distributed systems?
What do you mean by the term Triple-DES?
Provide a brief introduction of term Opera?
What do you mean by the term Ambiguous Grammars? Describe it by using an example.
Give a brief explanation of Burn down.
Write down the different Prototype Models Types.
What is CAML?
Explain the common pitfalls of the SOA?
18,76,764
1939332 Asked
3,689
Active Tutors
1428443
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!