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Demonstrate the Design of associations During object design phase we must design a strategy to implement associations. Association may be unidirectional or bi-directional. Wha
describe all the tables you have created. ?get table_name, status, num_rows, user_stats in user_tables system view ?get table_name, constraint_name, constraint_type in user_constr
explain three types of internet risks to the consummers whent he business system is data dependent. how can we minimise these risks
Example: Consider the following relations: ROLLNO NAME ADDRESS COURSE_ID 100 Ka
If the deletion violates referential integrity constraint, then three alternatives are available: Default option: - refuse the deletion. It is the job of the DBMS to describ
Saving Derived Attributes to Avoid Re-computation As discussed, "redundancy means duplication of exact data". But, if multiple copies of same data are present in the system,
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
What are the two types of serializability? The two types of serializability is a) Conflict serializability b) View serializability
Consider the relation schemas as follows. works (person name, company name, salary); lives (person name, street, city); located in(company name, city); managers (person name
external and internal mapping with examples
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