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a) Suppose we updated the catalog tables in real time, that is, after every update, insert, or delete SQL statement were executed-rather than only running RUNSTATS once every few
What is called a query evaluation plan? A sequence of primitive operations that can be used to assess a query is a query evaluation plan or a query implementation plan.
How many levels can be viewed in Architecture of the database ? Architecture of the database can be viewed as three levels.
er diagtram for icici
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
Question 1 Suppose the employee employee id, name, designation, salary, attendance and address of any employee has to be stored in a database. You can store these data in a sequen
While sorting field groups we cannot use more than one key field False.
Explain Composite attribute in SQL ? Composite attribute: A composite attribute has many components, each of that is atomic or composite.
Using Relational Algebra which query finds customers, who have a balance of over 1000 ? Using Relational Algebra Π Customer_name( σ balance >1000(Deposit)) is query to find cu
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