Explain that ethnicity and ethnic diversity have an impact on political behavior and goods distribution. Specifically, we have seen that ethnicity influences the way people vote, the strategies of political parties (and party formation), and the way public goods like roads and schools are dispersed in society. Overall, to what extent can … Read more
(More aggregation with grouping) Based on the conference database on the website, and using WHERE to express joins between tables, write SQL queries for the following tasks: A For each room in which any session is being held, show the room ID and the number of sessions being held there (with the column heading NumSessions). … Read more
(More aggregation with grouping) Download, save, and open the database bookstore‐2000.mdb from the website. This database is a somewhat more complicated retail database than our plumbing database. The price actually charged the customer is the cost_of_ each attribute in the ORDERLINES table, and can be lower than the retail_price attribute in the BOOKS table, reflecting … Read more
(Criteria after aggregation) Based on the conference database on the website, write SQL queries to for the following tasks: A Show the first and last name of all speakers who are appearing in least three sessions. Also show the number of sessions each such speaker is appearing in, labeled NumSessions. B Show the first and … Read more
(Simple sorting) Based on the plumbing supply store database from Chapter 7, write SQL queries to perform the following tasks: A Show the name, unit price, units in stock, and units on order for each product, sorted alphabetically by product name. B Show the same information as in part (a), but sorted from the largest number … Read more
(Sorting information extracted from multiple tables) Based on the plumbing supply store database from Chapter 7, write SQL queries to perform the following tasks: A Show the name of each product and the total amount of revenue it has generated (labeled Revenue). The output should be sorted by revenue, with the highest‐revenue products first; products that … Read more
(Mixed queries on the conference database) From the textbook website, download the conference database. Write SQL queries for the following: A Show a “master schedule” for the conference. For each presentation at the conference, this query should list the date, session start time, session title, room, speaker first name, and speaker last name. It should … Read more
(Bookstore) Download the sample database bookstore‐2000.mdb from the book website. Write SQL to perform the following queries: A Consider all pairs of books with the following properties: they have the same author name, the second book’s publication year is later than the first book’s, and the second book’s retail price is at least $5 more … Read more
(Conference database): From the textbook website, download the file conference.mdb, which describes the sessions and speakers at a conference. Write SQL queries for the following: A Show the first name, last name, e‐mail address, and area of expertise for every speaker, along with the number of sessions they are speaking in, labeled NumSessions. If a … Read more
(Sports league): Download the sports league database on the book website, and write SQL queries for the following: A Show the first names, last names, and phone numbers of all players with skill level “A,” followed by their team nicknames. Sort the results alphabetically first by team nickname and then by player last name. B … Read more