DataWars: More JOIN operations
This tutorial introduces the notion of a join. The database
consists of three tables
movie
,
actor
and
casting
.
| id | title | yr | director | budget | gross |
| id | name |
| movieid | actorid | ord |
More details about the database.
1962 movies
List the films where the yr is 1962 [Show id, title]
SELECT id, title
FROM movie
WHERE yr=1962
SELECT id, title
FROM movie
WHERE yr=1962
When was Citizen Kane released?
Give year of 'Citizen Kane'.
SELECT yr
FROM movie
WHERE title='Citizen Kane'
Star Trek movies
List all of the Star Trek movies, include the id, title and yr (all of these movies include the words Star Trek in the title). Order results by year.
SELECT id,title, yr FROM movie
WHERE title LIKE 'Star Trek%'
ORDER BY yr
id for actor Glenn Close
What id number does the actor 'Glenn Close' have?
SELECT id FROM actor
WHERE name= 'Glenn Close'
id for Casablanca
What is the id of the film 'Casablanca'
SELECT id
FROM movie
WHERE title='Casablanca'
Cast list for Casablanca
Obtain the cast list for 'Casablanca'.
Use movieid=11768, (or whatever value you got from the previous question)
SELECT name
FROM casting, actor
WHERE movieid=(SELECT id
FROM movie
WHERE title='Casablanca')
AND actorid=actor.id
Alien cast list
Obtain the cast list for the film 'Alien'
SELECT name
FROM movie, casting, actor
WHERE title='Alien'
AND movieid=movie.id
AND actorid=actor.id
Harrison Ford movies
List the films in which 'Harrison Ford' has appeared
SELECT title
FROM movie, casting, actor
WHERE name='Harrison Ford'
AND movieid=movie.id
AND actorid=actor.id
Harrison Ford as a supporting actor
List the films where 'Harrison Ford' has appeared - but not in the starring role. [Note: the ord field of casting gives the position of the actor. If ord=1 then this actor is in the starring role]
SELECT title
FROM movie, casting, actor
WHERE name='Harrison Ford'
AND movieid=movie.id
AND actorid=actor.id
AND ord<>1
Lead actors in 1962 movies
List the films together with the leading star for all 1962 films.
SELECT title, name
FROM movie, casting, actor
WHERE yr=1962
AND movieid=movie.id
AND actorid=actor.id
AND ord=1
Harder Questions
Busy years for Rock Hudson
Which were the busiest years for 'Rock Hudson', show the year and the number of movies he made each year for any year in which he made more than 2 movies.
SELECT yr,COUNT(title) FROM
movie JOIN casting ON movie.id=movieid
JOIN actor ON actorid=actor.id
WHERE name='Doris Day'
GROUP BY yr
HAVING COUNT(title) > 1
SELECT yr,COUNT(title) FROM
movie JOIN casting ON movie.id=movieid
JOIN actor ON actorid=actor.id
where name='Rock Hudson'
GROUP BY yr
HAVING COUNT(title) > 2
Lead actor in Julie Andrews movies
List the film title and the leading actor for all of the films 'Julie Andrews' played in.
SELECT movieid FROM casting
WHERE actorid IN (
SELECT id FROM actor
WHERE name='Julie Andrews')
SELECT title, name
FROM movie, casting, actor
WHERE movieid=movie.id
AND actorid=actor.id
AND ord=1
AND movieid IN
(SELECT movieid FROM casting, actor
WHERE actorid=actor.id
AND name='Julie Andrews')
Actors with 15 leading roles
Obtain a list, in alphabetical order, of actors who've had at least 15 starring roles.
SELECT name
FROM casting JOIN actor
ON actorid = actor.id
WHERE ord=1
GROUP BY name
HAVING COUNT(movieid)>=15
released in the year 1978
List the films released in the year 1978 ordered by the number of actors in the cast, then by title.
SELECT title, COUNT(actorid)
FROM casting,movie
WHERE yr=1978
AND movieid=movie.id
GROUP BY title
ORDER BY 2 DESC,1 ASC
with 'Art Garfunkel'
List all the people who have worked with 'Art Garfunkel'.
SELECT DISTINCT d.name
FROM actor d JOIN casting a ON (a.actorid=d.id)
JOIN casting b on (a.movieid=b.movieid)
JOIN actor c on (b.actorid=c.id
and c.name='Art Garfunkel')
WHERE d.id!=c.id
