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Under what siyuations would you use sequential file over database? Explain these situations. When would the database be more beneficial than sequential file? Is it possible for two kinds of permanent storage to be used interchangeably? Describe your answers.
A Relational schema of your database in 3NF, clearly indicating attributes, the data type of each attribute, primary and foreign keys, candidate keys, and which attributes are nullable, giving reasons. List any assumptions you need to make.
Write a SELECT statement which returns three columns: VendorName, InvoiceCount, and InvoiceSum. InvoiceCount is the count of the number of invoices, and InvoiceSum is the sum of the InvoiceTotal column.
Write the name(s) of employee(s) who works(work) on every project located in Houston. Write the name(s) of employee(s) who only works(work) on every project located in 'Houston.'
Mark the following words in the document as index entries: behavior (four instances), favorable (five instances), and impression (eight instances).
Data Modelling (database) require 8 page essay covering the following subjects: Organizational Intelligence. It must specifically talk about organizational intellignece being outcome of organization's efforts.
Describe the entity-relationship model. How are entities, relationships, and attributes represented in this model? What is a composite entity? Describe the approach to diagrams that uses a crow's foot.
You are interested in analyzing some hard-to-obtain data from two separate databases. Each database contains n numerical values.
Estimate the height of the B+ tree. (Giving a range of heights is fine.) Also estimate the amount of memory needed to store the tree, including leaves but not including the posting lists themselves.
Evaluate the success WellCo and PharmaCARE shareholders
Implement a database of courses and students for a school.
Explain the role of a database administrator,the tasks performed by this role and why this role is important in Database Management.
Why do you believe that views by themselves are insufficient for protecting access by unauthorized users?
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