Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 14 Sep 2017 My Price 6.00

Dept relation in SQL

Exercise 3.8 Answer each of the following questions briefly. The questions are based on the following relational schema:

 

Emp(eid: integer, ename: string, age: integer, salary: real) Works(eid: integer, did: integer, pct time: integer)

Dept(did: integer, dname: string, budget: real, managerid: integer)

 

1.    Give an example of a foreign key constraint that involves the Dept relation. What are the options for enforcing this constraint when a user attempts to delete a Dept tuple?

 

2.    Write the SQL statements required to create the above relations, including appro- priate versions of all primary and foreign key integrity constraints.

3.    Define the Dept relation in SQL so that every department is guaranteed to have a manager.

4.    Write an SQL statement to add ‘John Doe’ as an employee with eid = 101,

age = 32 and salary = 15, 000.

5.    Write an SQL statement to give every employee a 10% raise.

6.    Write an SQL statement to delete the ‘Toy’ department. Given the referential integrity constraints you chose for this schema, explain what happens when this statement is executed.

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Maurice Tutor
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Status NEW Posted 14 Sep 2017 11:09 AM My Price 6.00

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