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Write short notes on tuple relational calculus.
The tuple relational calculation is anon procedural query language. It defines the desired information without giving a particular procedure for obtaining that information.
If R1 and R2 are two union compatible relations or functions, then the result of R3 = R1 ∩R2 is the relation that contains all tuples that are in both the relations In other words,
Define Partial Key and Primary Key A partial key, also known as discriminator, is the set of attributes which can uniquely identify weak entities that are related to similar o
Define access time. Access time is the time from when a read or write request is issued to when data transfer starts.
Haw does it work one database application
We face problem of stock Opening balance and closing balance in Minus
What are the various properties of Relational tables? Relational tables have 6 properties: 1. Each row is unique. 2. Column values are of the same kind. 3. Values are
Describe the shadow paging technique.
Explain the function of Object model Object model describes the classes of objects in system, including their attributes and operations which they support. The analysis object
construct a b-tree for the following set of key values 2,3,5,7,11,17,19,23,29,31.assume that the tree is initial empty and the values are added in ascending order
In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.
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