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A relation has: Relational Schema Relation instance Relational Schema: A relational schema shows the relation's name, its attributes and the domain of every a
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
What is a value? A data value is used for identity. This form of identity is used in relational systems.eg: The primary key value of a tuple recognize the tuple.
The Maximum no of key fields that can be used in a header is?? 50
What is average response time? The average response time is that the average time for a transaction to be done after it has been submitted.
Define various ways in which SELECT statement can be used for record selection Technology? SELECT gives you control over a number of aspects for record retrieval: 1) Which
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:
a method named WonGame that checks each letter in the word is matched by its label
What are the various symbols used to draw an E-R diagram? Explain with the help of an example how weak entity sets are represented in an E-R diagram. Various symbols used to d
What are ways of finding out either an update is required or not for derived attributes? The ways to find out an update is required or, not are as: Explicit update
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