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Q. Explain data aggregatio n and discuss different design constraints. Sol. Aggregation One limitation of the E-R model is that it cannot express relationships amon
i am required to come up with entities relationships, optionality and cardinality from a scenario. there is a night club and bookings for a musician band
Explain the paths in the association network We can analyze use of paths in the association network as given below: Calculate each operation Find associations whic
What are temporary tables? Temporary tables exist solely for a particular session or whose data persists for the duration of the transaction.
What is meant by functional dependencies? Consider a relation schema R and α C R and β C R. The functional dependency α ->β holds on relational schema R if in any legal relati
Compute the closure (F+) for the following set of the functional dependencies defined on R(a,b,c,d), where F - {c→ a, ab → d, a → b, d → c}, i.e. what are all of the FDs implied b
Discuss how the one-to-one associations have to be implemented. Some of properties of associations can be implemented directly by providing suitable declarations of the data me
Synonyms It allows short names or alternative names for objects. Example : CREATE SYNONYM D30 FOR EMPD30; Now if we give command:
sy bcs project of hospital managment system
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