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Define physical and logical data independence. How does this architecture help in achieving these? Data independence entails that change in one view must not need a change in t
what is the importance of back up files
Name the metrics for selecting top algorithm There are a number of metrics for selecting top algorithm: i) Computational complexity: Computational complexity refers to eff
, write the relational schema, and draw the new dependency diagrams. Identify the normal forms for each table structure you created
Explain Record Based Logical Models? Record-Based logical Models: Also define data at the conceptual and view levels. Unlike object-oriented models, are used to state overall
Nested Queries Let us see some more complex queries in this section. Sub-queries: Some of the basic concerns of sub-queries are: A sub-query is a SELECT statemen
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
what is bogus empowerment. And what is genuine empowerment
Describe Database state in details? Database state: The actual data within the database at a particular moment in time is known as a database state.
What is use of generating such tables? How can you create temporary tables? When you require a table only for a short time after that you want it to disappear automatically you
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