Description

Submit all queries in a file called lastnameFirstnameL3.sql (e.g. chaturvediRituL3.sql)
Step 1. Connect to linux.socs.uoguelph.ca and Postgres (see tutorial1 for details).
Step 2. Download the following 2 scripts from Moodle and run them on
Postgres:
(1) movies_schema.sql to create and populate the movie database
(2) movies_schema_alter.sql to add primary and foreign keys to the created tables.
Remember, to run the scripts on Postgres, use i (e.g. i movies_schema.sql). >select * from movie;
mid | title | year | director —–+————————-+——+——————
101 | Gone with the Wind | 1939 | Victor Fleming
102 | Star Wars | 1977 | George Lucas
103 | The Sound of Music | 1965 | Robert Wise
104 | E.T. | 1982 | Steven Spielberg
105 | Titanic | 1997 | James Cameron
106 | Snow White | 1937 |
107 | Avatar | 2009 | James Cameron
108 | Raiders of the Lost Ark | 1981 | Steven Spielberg
(8 rows)
>select * from reviewer;
rid | name —–+——————
201 | Sarah Martinez
202 | Daniel Lewis
203 | Michael Walsh
204 | Mike Anderson
205 | Chris Jackson
206 | Elizabeth Thomas
207 | John Moore
208 | Ashley White
(8 rows)
>select * from rating;
rid | mid | stars | ratingdate —–+—–+——-+————
201 | 101 | 2 | 2011-01-22
201 | 101 | 4 | 2011-01-27
202 | 106 | 4 |
202 | 107 | 3 | 2011-10-02
203 | 103 | 2 | 2011-01-20
203 | 108 | 4 | 2011-01-12
203 | 108 | 2 | 2011-01-30
204 | 101 | 3 | 2011-01-09
205 | 101 | 3 | 2011-01-27
205 | 102 | 2 | 2011-01-27
205 | 105 | 4 | 2011-01-27
205 | 106 | 2 | 2011-01-27
205 | 107 | 3 | 2011-01-27
205 | 103 | 3 | 2011-01-27
205 | 104 | 2 | 2011-01-22
205 | 108 | 4 |
206 | 107 | 3 | 2011-01-15
206 | 106 | 5 | 2011-01-19
207 | 107 | 5 | 2011-01-20
208 | 104 | 3 | 2011-01-02
(20 rows)
rating(rid) is a foreign key that references table reviewer rating(mid) is a foreign key that references table movie
Step 3: Write SQL queries to do the following:
1. List names of reviewers who reviewed all movies reviewed by ‘Elizabeth Thomas’. Expected Result:
name ——————
Daniel Lewis
Chris Jackson
Elizabeth Thomas
(3 rows)
2. List all reviewers and the total number of movies reviewed by them
SELECT count (*) AS total FROM Movie;
Expected Result:
name | total ——————+—— Chris Jackson | 8
Michael Walsh | 3
Daniel Lewis | 2
Elizabeth Thomas | 2
Sarah Martinez | 2
Ashley White | 1
Mike Anderson | 1
John Moore | 1
(8 rows)
3. List all movies that have been reviewed by 2 or more reviewers.
Expected Result:
title | Reviewed by ————————-+————-
Gone with the Wind | 4
Avatar | 4
Raiders of the Lost Ark | 3
Snow White | 3
E.T. | 2 The Sound of Music | 2
(6 rows)
4. Which movies have the highest rating?
Expected Result: title ————
Snow White
Avatar
(2 rows)
5. List the oldest movie (in this database) that has been reviewed.
Expected Result: title ————
Snow White
(1 row)