sqlzoo習題答案--More JOIN operations

This tutorial introduces the notion of a join. The databaseconsists of three tables movie , actor and casting .

movie

id

title

yr

director

budget

gross

actor

id

name

casting

movieid

actorid

ord

3.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

6.Obtain the cast list for 'Casablanca'.

what is a cast list?

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 actor join casting
on actor.id=casting.actorid
where movieid='11768'

7.Obtain the cast list for the film 'Alien'

select name from actor
join casting
on casting.actorid=actor.id
join movie
on movie.id=casting.movieid
where title='Alien'

8.List the films in which 'Harrison Ford' has appeared.

select title from movie
join casting
on casting.movieid=movie.id
join actor
on actor.id=casting.actorid
where name='Harrison Ford'

9.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
join casting
on casting.movieid=movie.id
join actor
on actor.id=casting.actorid
where name='Harrison Ford'and ord!=1

10.List the films together with the leading star for all 1962 films.

select title,name 
from movie join casting
on movie.id=casting.movieid
join actor
on casting.actorid=actor.id
where yr='1962'and ord=1

11.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)>2

12.List the film title and the leading actor for all of the films 'Julie Andrews' played in.

*****方法一*****

select title,name 
from movie join casting on movie.id=casting.movieid and ord=1
           join actor on actor.id=casting.actorid
where movie.id in
 (SELECT movieid FROM casting
    WHERE actorid IN (
       SELECT id FROM actor
       WHERE name='Julie Andrews'))

*****方法二*****

    SELECT DISTINCT(title),name FROM movie inner join casting on movie.id=movieid  
    inner join actor on actorid=actor.id and ord=1  
    WHERE movieid IN (  
      SELECT t2.movieid FROM actor t1 inner join casting t2 on t2.actorid=t1.id and name='Julie Andrews')  

13.Obtain a list, in alphabetical order, of actors who've had at least 30 starring roles.

select name from actor
join casting on casting.actorid=actor.id
join movie on movie.id=casting.movieid and ord=1
group by name
having count(title)>=30
order by name

14.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 movie join casting 
on casting.movieid=movie.id and yr='1978'
group by title
order by count(actorid)desc,title

15.List all the people who have worked with 'Art Garfunkel'.

*****方法一*****

select name from actor
join casting on actor.id=casting.actorid
where movieid in
(select movieid from casting where actorid in(select id from actor
where name='Art Garfunkel'))and name!='Art Garfunkel'

*****方法二*****

select name from actor
join casting on actor.id=casting.actorid
where movieid in
(select movieid from casting join actor 
 on casting.actorid=actor.id
where name='Art Garfunkel')and name!='Art Garfunkel'