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Consider the following relational schema and briefly answer the ques- tions that follow:
Emp(eid: integer, ename: string, age: integer, salary: real) Works(eid: integer, did: integer, pct time: integer) Dept(did: integer, budget: real, managerid: integer)
1. Define a table constraint on Emp that will ensure that every employee makes at least $10,000.
2. Define a table constraint on Dept that will ensure that all managers have age > 30.
3. Define an assertion on Dept that will ensure that all managers have age > 30. Compare this assertion with the equivalent table constraint. Explain which is better.
4. Write SQL statements to delete all information about employees whose salaries exceed that of the manager of one or more departments that they work in. Be sure to ensure that all the relevant integrity constraints are satisfied after your updates.
Create Queries and explain the purpose of each query in detail.
Design and develop a database using professional principles and standards. Provide a logical and physical design of the database.
Consider system which produces budget reports for department at university. For whichever system you select, answer the following design questions. Who will use output?
Discuss the advantages of a database management approach to the file processing approach? Give examples to illustrate your answer.Outline the benefits and limitations of the relational database model for business applications today?
In the prior phase, you started work on some of the application's graphical user interface (GUI). In this assignment, you will add a data entry form to the GUI and create a local database that will synchronize data to the isolated storage containe..
How would your answers to the two questions change, if at all, if your system did not support indexes with multiple-attribute search keys?
What are the advantages and disadvantages of front-end and back-end validation and in which specific situations would one technique of validation be preferred over the other?
Suppose a sequential file contains 50,000 records, and 5 milliseconds are required to interrogate an entry. How long should we expect to wait when retrieving a record from the middle of the file?
You will write a report describing the database design development life cycle and describe in details the steps needed to properly create the database you have selected for your Key Assignment
How is the object approach different from the data and process approaches to systems development? And how can the object approach improve the systems development process
Importing and Analyzing Sales Data- Security Enablers is a national company that provides security systems for small businesses. They have asked you to use the company template and import sales for the last five years
Suppose we are to design a registrar's database to store information about students, courses, the courses students have taken. Convert the E/R diagram into a relational schema.
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