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What are object interaction diagrams?
Object interaction diagrams are the diagrams that used to describe order in which messages are communicated in execution of an operation, and this information is used as guidance for implementation of the individual operations.
Why older data models are being replaced by new data modelling 100 words accepted#
Q. Describe how an ER schema can be represented by relation schemas and constraints arising from ER design can be mapped to constraints on a relation schema. The entity rela
Explain the conventions (relationships) for displaying an ER schema as an ER diagram.
Problem: You are given the following schema 1. Flights(flno, from, to, distance) 2. Aircraft(aid, flno, aname, cruisingRange) 3. Certified(eid, aid) 4. Employees(eid, ena
how to data store?
Consider the relation PERSON. If you want to display details of persons having age less than or equal to 30 than the select operation will be used as follows: σ AGE The resu
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
Evaluate, compare and contrast the two methods of relational database design namely top down method and Bottom up method. What will be your choice if you are asked to select a meth
What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
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