subject
Computers and Technology, 29.01.2021 16:40 leo4687

Create 7 tables for the following parameters: A. users: userid (int, primary key), name (text)
B. movies: movieid (integer, primary key), title (text)
C. taginfo: tagid (int, primary key), content (text)
D. genres: genreid (integer, primary key), name (text)
E. ratings: userid (int, foreign key), movieid (int, foreign key), rating (numeric), timestamp (bigint, seconds since midnight Coordinated Universal Time (UTC) of January 1, 1970)
F. tags: userid (int, foreign key), movieid (int, foreign key), tagid (int, foreign key), timestamp (bigint, seconds since midnight Coordinated Universal Time (UTC) of January 1, 1970).
G. hasagenre: movieid (int, foreign key), genreid (int, foreign key)
Now write queries for the following
Note: Do not put "create/select/drop database", or "set system settings or encoding"
1. Write a SQL query to return the total number of movies for each genre. Your query result should be saved in a table called "query1" which has two attributes: "name" attribute is a list of genres, and "moviecount" list of movie counts for each genre.
2. Write a SQL query to return the average rating per genre. Your query result should be saved in a table called "query2" which has two attributes: "name" attribute is a list of all genres, and "rating" attribute is a list of average rating per genre.
3. Write a SQL query to return the movies which have at least 10 ratings. Your query result should be saved in a table called "query3" which has two attributes: "title" is a list of movie titles, and "CountOfRatings" is a list of ratings.
4. Write a SQL query to return all "Comedy" movies, including movieid and title. Your query result should be saved in a table called "query4" which has two attributes: "movieid" is a list of movie ids, and "title" is a list of movie titles.
5. Write a SQL query to return the average rating per movie. Your query result should be saved in a table called "query5" which has two attributes: "title" is a list of movie titles, and "average" is a list of the average rating per movie.

ansver
Answers: 3

Another question on Computers and Technology

question
Computers and Technology, 22.06.2019 15:10
Consider a direct-mapped cache with 216 words in main memory. the cache has 16 blocks of 8 words each. it is a word-addressable computer (rather than a byte-addressable computer which we normally discuss). (a) how many blocks of main memory are there? (b) what is the format of a memory address as seen by the cache, that is, what are the sizes of the tag, cache block, and block offset fields (if they apply)? (c) to which cache block will the memory reference db6316 map?
Answers: 1
question
Computers and Technology, 22.06.2019 16:10
When copying and pasting text, the first step is move your cursor type the text select the copy command select the paste command
Answers: 2
question
Computers and Technology, 22.06.2019 16:20
Octothorpe is another name for what common computer keyboard symbol?
Answers: 1
question
Computers and Technology, 23.06.2019 03:50
Iam a bacterium. i cause stomach cramps and diarrhea. i am caused by eating rotten foodssuch as chicken, fish, or eggs. sometimes turtles carry my bacteria.what am i?
Answers: 2
You know the right answer?
Create 7 tables for the following parameters: A. users: userid (int, primary key), name (text)
Questions
question
Mathematics, 06.01.2021 21:20
question
English, 06.01.2021 21:20
question
Mathematics, 06.01.2021 21:20
question
Mathematics, 06.01.2021 21:20