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Partial Key: It is a group of attributes that can uniquely identify small entities and that are related to same base entity. It is sometime named as Discriminator.
Alternate Key: All Candidate Keys remaining the Primary Key are called as Alternate Keys.
Artificial Key: If no obvious key either compound or stands alone is available, then the last resort is to simply give a key, by assigning a distinct number to every occurrence or record. Then this is called as developing an artificial key.
Compound Key: If no single data component uniquely identifies occurrences within a developed, then combining multiple components to make a distinct identifier for the construct is called as creating a compound key.
Natural Key: When one of the data components stored within a construct is used as the primary key, and then it is known the natural key.
Prepare a data flow diagram for computing the volume and surface area of a cylinder. Inputs are the height and radius of the cylinder. Outputs are the volume and surface area of th
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What is deadlock? Neither of the transaction can ever proceed with its normal implementation. This situation is known as deadlock.
usecase diagram,activity diagraM,SEQUENCE DIAGRAM
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For each 1: n relationship type R involving two entities E1 and E2, we recognize the entity type (say E1) at the n-side of the relationship type R and contain primary key of the en
4. Describe three ways to handle missing field values
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There are a number of possible solutions to the open ended brief. One of the simple ones is shown here without the PKs and FKs. It is important to think of how a number of tasks
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