Create a query to produce single output-er model, Database Management System

This assignment concerns the Research database. The database ER model is shown above, where attributes are omitted for clarity. The relational model for the database is:

Department(DeptNum, Descrip, Instname, DeptName, State, Postcode)

Academic(AcNum, DeptNum*, FamName, GiveName, Initials, Title)

Paper(PaNum, Title)

Author(PaNum*, AcNum*)

Field(FieldNum, ID, Title)

Interest(FieldNum*, AcNum*, Descrip)

DeptNum, AcNum, PaNum, and FieldNum are the identifiers of departments, academics, papers, and fields of interest respectively. Each Academic belongs to one Department and is the author of some (or no) Papers. Each Paper has at least one author. The table Fielddescribes areas of research work; each Academic works in some (or no) Fields, and may provide a description Descrip of their work.

The research database is used by the Department of Education, Science and Training of the Australian government on a regular basis to report on academic departments of education institutions. To this end, you are asked to write SQL queries, and present the report based on the output from your queries. Note that data inconsistency has been introduced during the data entry process, which you have to take care of in producing your report. It is known that the same state information may be represented in different ways. For example, Victoria may be kept as VIC, vic, or Vic. It is also known there are missing values for some attributes. For example, not all academic departments have their State information recorded in the database.

1. How many institutions contain the word "Technology" in their name. Your query must produce a single number as its output.

2. Make a list of academics that have more than five interests and have written or co-written less than ten papers. Use one IN construct and one EXISTS construct in your query. Output all details of the academics in the list.

3. Use a Set operator to create a list of academics who have written or co-written more than 5 papers and also have greater then 3 interests. List their academic number in the output.

4. Explain the following SQL query in English;

select givename, famname, instname

from academic natural join department

where acnum in

(select acnum

from author

where acnum not in

(select acnum

from interest

group by acnum))

and deptNum in (select deptNum

from academic

where deptname = 'Computer Science');

5. Find all the academics who have co-written a paper with academic number 151. Use only the Author table in a join query. You can use multiple instances of the table. The output should list the academic number of each co-author just once in the output. The output should not include academic number 151.

6. Write a query to find papers with more than five authors where the authors all come from different departments.

Posted Date: 3/19/2013 5:34:57 AM | Location : United States







Related Discussions:- Create a query to produce single output-er model, Assignment Help, Ask Question on Create a query to produce single output-er model, Get Answer, Expert's Help, Create a query to produce single output-er model Discussions

Write discussion on Create a query to produce single output-er model
Your posts are moderated
Related Questions
Explain the term - Control as Concurrent Tasks As we know, any object can be implemented as a task in programming language or operating system. This is the most general approa

Creating views with check option : This option limits those updates of data values that cause records to go off the view. The following instance tells this in more detail: Examp

Project Description: We have an encrypted HSQL Database which we want to change into csv format. HSQL DB . We have java application (jar file) which reads that database but n

DML Precompiler All the DBMS have two basic sets of Languages - Data Definition Language (DDL) that have the set of commands needed to define the format of the data that is b

Define the terms 1) physical schema 2) logical schema. Physical schema: The physical schema explains the database design at the physical level, which is the lowest level of abs



What is the use of RAID? A variety of disk-organization methods, collectively called redundant arrays of independent disks are used to better the performance and reliability.

The Conceptual Level or Global level The conceptual level presents a logical view of the complete database as a unified whole. It permits the user to bring all the data in th

What is a homogeneous distributed database? In homogeneous distributed databases, all sites have the same database management system software, are aware of one another, and agr