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Problem
Explain at least five relational algebraic operators with a suitable example.
Note: All the above descriptions should be done by taking at least two examples from outside (Other than the text book examples)
explain external view
as a customer service employee, explain five measures you would recommend a displeased student to patronise a school canteen
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
What is substitutability? Any method of a class-say A can equally well be adjured with any object belonging to any subclasses B of A. This characteristic leads to code reuse, a
What is called a query evaluation plan? A sequence of primitive operations that can be used to assess a query is a query evaluation plan or a query implementation plan.
An important first step to the statistical analysis of data is to "get to know your data". The following tasks should contribute to this. (a) To the right of the dataset cons
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
assume we have the following apllicationthat model sccer team the games they play and the players inv each teamin the design we want to capture
Need a sample of a clinic database relationships
Explain data independence ? Data independence is the capacity to modify the schema at one stage of a database system without having to change the schema at the further level.
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