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What do you understand by a view? What does WITH CHECK OPTION clause for a view do?
- A view is a virtual table which comprises fields from one or more real tables.
- It is generally used to join multiple tables and get the data.
- WITH CHECK OPTION for a view prevents any modification to the data that doesn't confirm to WHERE clause of the view definition.
- This allows data belonging to the view to be updated through view.
what is lossless & dependency preserving decomposition ?
About Attribute inheritance
we need example of 2phase locking
In object oriented design, which steps must designer take to adjust inheritance? To readjust inheritance following steps should be taken: i) Rearrange and adjust the classe
What is a hash index? A hash index organizes the search keys, with their associated pointers, into a hash file structure.
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
Question: This form represents one of a number used for each sailing of a range of boats. A passenger may go on many sailings and will have the same passenger number for each.
What is DAG? The class-subclass relationship is shown by a directed acyclic graph.eg: employees can be temporary or permanent. We might be create subclasses temporary \and perm
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What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
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