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Three way to handle missing field val
What is multiplicity in the associations? Give an example to explain multiplicity? Multiplicity in association indicate number of objects participate in any relationship. For
What is the use of rename operation? Rename operation is used to rename both relations and an attributes. It uses the as clause, taking the form: Old-name as new-name.
What is a primary index? A primary index is an index whose search key also explains the sequential order of the file.
What is called a query -execution engine? The query implementation engine takes a query evaluation plan, implements that plan, and returns the answers to the query.
using the invoice table shown below,write the relational schema,draw a dependencies,inclunding all partial and transitive dependencies.assume that the table does not contain repeat
For the relations R and S given below: R S A B C 1 4 7 2 5 8 3 6 9
Define data model? A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.
OBJECTIVES After going through this unit you should be capable to: Explain the File Based system and its limitations; Explain the structure of DBMS; Explain the
why three level architecture had been developed/
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