While meandering around the web for sql exercises and tutorials I came across www.sqlzoo.net.
It is the perfect place to get hands on knowledge for SQL, especially JOINS!
Below are solutions to all the questions on the More JOIN Operations tutorial. Questions 1-6 are plain straightforward. Questions 7-11 are basic join questions and 12-16 and pretty hard. I ended up spending quite some time trying to solve the last bunch.
Here are all the solutions in case you got stumped. (I just included all questions for completeness)
Problem 1 : List the films where the yr is 1962 [Show id, title]
This one is pretty straightforward.
Problem 2 : Give year of ‘Citizen Kane’.
This one too :
Problem 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.)
Problem 4 : What are the titles of the films with id 11768, 11955, 21191
Problem 5 : What id number does the actor ‘Glenn Close’ have?
Problem 6 : What is the id of the film ‘Casablanca’
## Real join questions begin :
Problem 7 : Obtain the cast list for ‘Casablanca’. Use the id value that you obtained in the previous question.
Problem 8 : Obtain the cast list for the film ‘Alien’
Problem 9 : List the films in which ‘Harrison Ford’ has appeared
Problem 10 : List the films where ‘Harrison Ford’ has appeared - but not in the star role. [Note: the ord field of casting gives the position of the actor. If ord=1 then this actor is in the starring role]
Problem 11: List the films together with the leading star for all 1962 films.
### These questions are a little bit hard. Give some time to crack them before looking at the solutions.
Problem 12 : Which were the busiest years for ‘John Travolta’. Show the number of movies he made for each year.
Problem 13 : List the film title and the leading actor for all of ‘Julie Andrews’ films.
Problem 14 : Obtain a list of actors in who have had at least 30 starring roles. (Yep, the result set this generates is a empty set)
Problem 15 : List the 1978 films by order of cast list size.
Problem 16 : List all the people who have worked with ‘Art Garfunkel’.
And there you have it! Hope it was helpful.