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Define union compatibility? Explain why INTERSECTION of two relations cannot be performed if they are not union compatible? Two relations R(A1, A2,-------, An) and S(B1, B2,--
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 are the different approaches for database design? There are two basic approaches for database design which are as follows: Attribute driven: It compiles a list of att
Distributed And Client Server Databases Introduction This unit tells the distributed database systems which are primarily relational and one important execution model: the
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
what is RDBMS? how it works? good example.
Hello.I have database access assignment which consist of creation Form, Subform, Calculation, Macros
draw er diagram using entities crop,employee,department,plot,cultivation plan,machinery,seed,fertilizer
what is stracture of dabms
Explain view in RDBMS? View - A view is a relation (virtual rather than base) and could be used in query expressions, which is, queries can be written by using the view as a re
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