Purchase Solution

A detailed example of a SQL select statement using GROUP BY

Not what you're looking for?

Ask Custom Question

The schema of the DB is as follows:

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)

Question 6:
Which fields have interests shared by academics from the same department? Output the field number, field ID and title, and the total number of academics who have interests.

I'm struggling with the conditions in the first part of the question.

Thanks Mick

Attachments
Purchase this Solution
Solution Summary

This solution provides a detailed example of how to use the GROUP BY clause with a SQL SELECT statement.

Solution Preview

This key to this query is the GROUP BY clause that can be used with a SELECT statement. The GROUP BY clause instructs the DBMS to combine rows of data based on the columns that are specified in the GROUP BY clause.

Consider the query:

<pre>
SELECT * FROM interest
</pre>

This query will return all of the rows from the interest table. There are lots of rows with the same FieldNum value. If the GROUP BY clause is added then we only get one row per unique FieldNum.

<pre>
SELECT * FROM interest GROUP BY FieldNum
</pre>

The power of GROUP BY is in the fact that you can aggregate the combined rows. The SELECT can show the number of rows that have the same FieldNum:

<pre>
SELECT *, count(FieldNum) FROM ...

Purchase this Solution
Free BrainMass Quizzes
Basic Computer Terms

We use many basic terms like bit, pixel in our usual conversations about computers. Are we aware of what these mean? This little quiz is an attempt towards discovering that.

Basic Networking Questions

This quiz consists of some basic networking questions.

Inserting and deleting in a linked list

This quiz tests your understanding of how to insert and delete elements in a linked list. Understanding of the use of linked lists, and the related performance aspects, is an important fundamental skill of computer science data structures.

Word 2010: Table of Contents

Ever wondered where a Table of Contents in a Word document comes from? Maybe you need a refresher on the topic? This quiz will remind you of the keywords and options used when working with a T.O.C. in Word 2010.

Javscript Basics

Quiz on basics of javascript programming language.

View More Free Quizzes
Related BrainMass Solutions

  • Kudler Fine Foods- Complete Database SQL Queries

    Question 6: Using the updated database, write the following queries using the SQL GROUP statement: a) Group employees by job classification: Select the employees' last names and group them by EEO-1 Classification.

  • SQL Statements To Run In SQl Server

    Finally, submit the SQL statements and the results - paste them into Word Document write queries using the SQL SELECT statement. **** Select all of the data from both tables before performing the following. ?

  • Writing SQL Queries Using a Database and Tables

    Using the updated database that includes employees from administrative offices and the Delmar location, write the following queries using the SQL GROUP BY statement: - Group employees by job classification: Select the employees' last names and group

  • A Detailed Explanation of SQL SELECT and GROUP BY Keywords

    In this solution I provide a detailed explanation of the SQL SELECT statement and the GROUP BY statement. Several examples are provided.

  • SQL Database

    Use the updated database to write the following queries, using the SQL GROUP statement: MAKE SURE TO USE THE GROUP METHOD - Select employees' last names and group them by EEO-1 classification.

  • Write SQL queries using BETWEEN, LIKE and UNION

    Using the updated database, write the following queries using the SQL GROUP BY statement and appropriate aggregate statements (when needed): Write a SQL query that displays the average salary / hourly wage grouped by job_title.

  • SQL Server Database for Kudler Fine Foods/Service

    Using the updated database, write the following queries using the SQL GROUP statement: · Group employees by job classification: Select the employees' last names and group them by EEO-1 Classification.

  • SQL Keyword SELECT

    Explain the use of the GROUP BY keyword. Include an example based on the CUSTOMER table from the General Sales database. The SELECT statement is used to pick data from a table and the result is stored in a result table.

  • Write SQL queries using Between, Like and Union.

    Solution: select * from example.employee where last_name like '[P-Z]%' Write the following queries using the SQL GROUP statement: • Group employees by job classification: Select the employees' last names and group them by EEO-1 Classification.

  • Microsoft SQL Server 2000 Problem

    Using the updated database, write the following queries using the SQL GROUP statement: A. Group employees by job code: Select the employee's last name and group them by job_title_code. B.

View More Related Solutions