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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.
Write short notes on domain relational calculus The domain relational calculus uses domain variables that take on values from an attribute domain rather than values for whole t
State about the Activity Diagram Activity diagrams show flow from one activity to other. It is an ongoing non atomic execution within a state machine. Activity finally results
tell me the functionality,advantages and disadvantages of student database
QUESTION (a) Consider a car database consisting of car model, car make, car origin, Engine capacity, color, cost.
brief history,definition,current trends and future trends if any of data fragmentation
Explain the structure of well formed formulae in relational calculus. Ans: a. An atom is a formula b. If P1 is a formula, after that so are ¬P1 and (P1) c. If P1 and P2 a
wh
define attribute inheritance with example?
What is Asterisk in SQL? Asterisk (*): In SQL, the columns for all the tables and views in the FROM clause will be displayed.
Table_Name( attribute_1, attribute_2, attribute_3, ….. ,attribute_x) Primary Key ( attribute_1, attribute_2) Foreign Key attribute_4 References Table_Name_2 (repeat for each fore
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