Difference between revisions of "More JOIN operations"
m (Changed question 12 text to "Which were the busiest years for 'John Travolta', show the year and the number of movies he made each year for any year in which he made at least 2 movies.") |
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− | + | <p>This tutorial introduces the notion of a join. The database | |
− | + | consists of three tables | |
− | |||
<code>movie</code> | <code>movie</code> | ||
, | , | ||
Line 9: | Line 8: | ||
. | . | ||
</p> | </p> | ||
− | + | ||
− | + | <table style='display:inline-block;margin:2ex;'><caption>movie</caption> | |
− | <table | + | <tr> |
− | + | <td><b>id</b></td> | |
− | + | <td>title</td> | |
− | + | <td>yr</td> | |
− | < | + | <td><i>director</i></td> |
− | + | <td>budget</td> | |
− | <tr><td> | + | <td>gross</td> |
− | + | </tr> | |
− | < | + | </table> |
+ | |||
+ | <table style='display:inline-block;margin:2ex;'><caption>actor</caption> | ||
+ | <tr> | ||
+ | <td><b>id</b></td> | ||
+ | <td>name</td> | ||
+ | </tr> | ||
+ | </table> | ||
+ | |||
+ | <table style='display:inline-block;margin:2ex;'><caption>casting</caption> | ||
+ | <tr> | ||
+ | <td><b><i>movieid</i></b></td> | ||
+ | <td><b><i>actorid</i></b></td> | ||
+ | <td><b>ord</b></td> | ||
+ | </tr> | ||
</table> | </table> | ||
+ | |||
+ | [[File:movie-er.png]] | ||
</div> | </div> | ||
<p> | <p> | ||
Line 34: | Line 49: | ||
</div></div> | </div></div> | ||
− | + | ==1962 movies== | |
− | |||
<div class='qu'> | <div class='qu'> | ||
List the films where the '''yr''' is 1962 [Show '''id''', '''title'''] | List the films where the '''yr''' is 1962 [Show '''id''', '''title'''] | ||
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</div> | </div> | ||
+ | ==When was Citizen Kane released?== | ||
<div class='qu'> | <div class='qu'> | ||
Give year of 'Citizen Kane'. | Give year of 'Citizen Kane'. | ||
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</div> | </div> | ||
+ | ==Star Trek movies== | ||
<div class='qu'> | <div class='qu'> | ||
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. | 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. | ||
Line 75: | Line 91: | ||
</div> | </div> | ||
− | + | ==id for actor Glenn Close== | |
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
<div class='qu'> | <div class='qu'> | ||
What '''id''' number does the actor 'Glenn Close' have? | What '''id''' number does the actor 'Glenn Close' have? | ||
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+ | ==id for Casablanca== | ||
<div class='qu'> | <div class='qu'> | ||
What is the '''id''' of the film 'Casablanca' | What is the '''id''' of the film 'Casablanca' | ||
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</div> | </div> | ||
− | + | [[Get to the point]] | |
+ | ==Cast list for Casablanca== | ||
<div class='qu'> | <div class='qu'> | ||
− | Obtain the cast list for 'Casablanca'. | + | Obtain the cast list for 'Casablanca'. |
− | Use | + | <div title='what is a cast list?' class=hint> |
+ | The cast list is the names of the actors who were in the movie. | ||
+ | </div> | ||
+ | Use '''movieid=11768''', (or whatever value you got from the previous question) | ||
<source lang='sql' class='def'> | <source lang='sql' class='def'> | ||
</source> | </source> | ||
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</div> | </div> | ||
+ | ==Alien cast list== | ||
<div class='qu'> | <div class='qu'> | ||
Obtain the cast list for the film 'Alien' | Obtain the cast list for the film 'Alien' | ||
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</div> | </div> | ||
+ | ==Harrison Ford movies== | ||
<div class='qu'> | <div class='qu'> | ||
List the films in which 'Harrison Ford' has appeared | List the films in which 'Harrison Ford' has appeared | ||
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</div> | </div> | ||
+ | ==Harrison Ford as a supporting actor== | ||
<div class='qu'> | <div class='qu'> | ||
− | List the films where 'Harrison Ford' has appeared - but not in the | + | 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. | [Note: the '''ord''' field of casting gives the position of the actor. | ||
If ord=1 then this actor is in the starring role] | If ord=1 then this actor is in the starring role] | ||
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</div> | </div> | ||
+ | ==Lead actors in 1962 movies== | ||
<div class='qu'> | <div class='qu'> | ||
List the films together with the leading star for all 1962 films. | List the films together with the leading star for all 1962 films. | ||
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</source> | </source> | ||
</div> | </div> | ||
+ | <hr> | ||
+ | Harder Questions | ||
+ | <hr> | ||
− | + | ==Busy years for John Travolta== | |
<div class='qu'> | <div class='qu'> | ||
− | Which were the busiest years for 'John Travolta', show the year and the number of movies he made each year for any year in which he made | + | Which were the busiest years for 'John Travolta', show the year and the number of movies he made each year for any year in which he made more than 2 movies. |
<source lang='sql' class='def'> | <source lang='sql' class='def'> | ||
SELECT yr,COUNT(title) FROM | SELECT yr,COUNT(title) FROM | ||
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</source> | </source> | ||
</div> | </div> | ||
+ | ==Lead actor in Julie Andrews movies== | ||
+ | <div class='qu'> | ||
+ | List the film title and the leading actor for all of the films 'Julie Andrews' played in. | ||
+ | <div class='hint' title='Did you get "Little Miss Marker twice"?'> | ||
+ | Julie Andrews starred in the 1980 remake of Little Miss Marker and not the original(1934). | ||
− | <div | + | Title is not a unique field, create a table of IDs in your subquery |
− | + | </div> | |
<source lang='sql' class='def'> | <source lang='sql' class='def'> | ||
+ | SELECT movieid FROM casting | ||
+ | WHERE actorid IN ( | ||
+ | SELECT id FROM actor | ||
+ | WHERE name='Julie Andrews') | ||
</source> | </source> | ||
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AND name='Julie Andrews') | AND name='Julie Andrews') | ||
</source> | </source> | ||
+ | {{#ev:youtube|BcNIDK5qYx8|854x480}} | ||
</div> | </div> | ||
+ | ==Actors with 30 leading roles== | ||
<div class='qu'> | <div class='qu'> | ||
− | Obtain a list of actors | + | Obtain a list, in alphabetical order, of actors who've had at least 30 starring roles. |
<source lang='sql' class='def'> | <source lang='sql' class='def'> | ||
</source> | </source> | ||
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<div class='qu'> | <div class='qu'> | ||
− | List the 1978 | + | <span class='param respectorder'></span> |
+ | List the films released in the year 1978 ordered by the number of actors in the cast, then by title. | ||
<source lang='sql' class='def'> | <source lang='sql' class='def'> | ||
</source> | </source> | ||
<source lang='sql' class='ans'> | <source lang='sql' class='ans'> | ||
− | SELECT title, COUNT(actorid) | + | SELECT title, COUNT(actorid) |
− | FROM casting, movie | + | FROM casting,movie |
WHERE yr=1978 | WHERE yr=1978 | ||
− | + | AND movieid=movie.id | |
GROUP BY title | GROUP BY title | ||
− | ORDER BY 2 DESC | + | ORDER BY 2 DESC,1 ASC |
</source> | </source> | ||
</div> | </div> |
Latest revision as of 20:50, 26 November 2017
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.
Contents
- 1 1962 movies
- 2 When was Citizen Kane released?
- 3 Star Trek movies
- 4 id for actor Glenn Close
- 5 id for Casablanca
- 6 Cast list for Casablanca
- 7 Alien cast list
- 8 Harrison Ford movies
- 9 Harrison Ford as a supporting actor
- 10 Lead actors in 1962 movies
- 11 Busy years for John Travolta
- 12 Lead actor in Julie Andrews movies
- 13 Actors with 30 leading roles
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'.
The cast list is the names of the actors who were in the movie.
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 John Travolta
Which were the busiest years for 'John Travolta', 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='John Travolta'
GROUP BY yr
HAVING COUNT(title)=(SELECT MAX(c) FROM
(SELECT yr,COUNT(title) AS c FROM
movie JOIN casting ON movie.id=movieid
JOIN actor ON actorid=actor.id
where name='John Travolta'
GROUP BY yr) AS t
)
SELECT yr,COUNT(title) FROM
movie JOIN casting ON movie.id=movieid
JOIN actor ON actorid=actor.id
where name='John Travolta'
GROUP BY yr
HAVING COUNT(title)=(SELECT MAX(c) FROM
(SELECT yr,COUNT(title) AS c FROM
movie JOIN casting ON movie.id=movieid
JOIN actor ON actorid=actor.id
where name='John Travolta'
GROUP BY yr) AS t
)
Lead actor in Julie Andrews movies
List the film title and the leading actor for all of the films 'Julie Andrews' played in.
Julie Andrews starred in the 1980 remake of Little Miss Marker and not the original(1934).
Title is not a unique field, create a table of IDs in your subquery
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 30 leading roles
Obtain a list, in alphabetical order, of actors who've had at least 30 starring roles.
SELECT name
FROM casting JOIN actor
ON actorid = actor.id
WHERE ord=1
GROUP BY name
HAVING COUNT(movieid)>=30
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
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