SQL

NotesB

@@ -0,0 +1,182 @@
+-- Turn on foreign key constraints (SQLite only)
+
+PRAGMA foreign_keys = ON;
+
+-- Creating the tables:
+
+CREATE TABLE album (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    title VARCHAR(128) NOT NULL,
+    release_year INTEGER
+);
+
+CREATE TABLE artist (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name VARCHAR(128) NOT NULL
+);
+
+CREATE TABLE track (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    title VARCHAR(128) NOT NULL,
+    album_id   INTEGER, --foreign key
+    FOREIGN KEY (album_id) REFERENCES album (id));
+
+
+CREATE TABLE artist_album (
+    artist_id INTEGER,
+    album_id INTEGER,
+    FOREIGN KEY(artist_id) REFERENCES artist(id),
+    FOREIGN KEY(album_id) REFERENCES album(id)
+);
+
+-- Populate tables
+
+INSERT INTO album (title, release_year) VALUES ("Super Awesome Album", 1990);
+INSERT INTO album (title) VALUES ("Super Funky Album");
+INSERT INTO album (title, release_year) VALUES ("Super Disco Album", 1978);
+INSERT INTO album (title, release_year) VALUES ("Super Hairband Album", 1984);
+INSERT INTO album (title) VALUES ("Super Dubstep Album");
+
+INSERT INTO artist (name) VALUES ("Luke and the Droidtones");
+INSERT INTO artist (name) VALUES ("Leia and the Ewoks");
+INSERT INTO artist (name) VALUES ("Han Solo");
+
+INSERT INTO artist_album (artist_id, album_id) VALUES (1, 5);
+INSERT INTO artist_album (artist_id, album_id) VALUES (1, 2);
+INSERT INTO artist_album (artist_id, album_id) VALUES (2, 1);
+INSERT INTO artist_album (artist_id, album_id) VALUES (2, 2);
+INSERT INTO artist_album (artist_id, album_id) VALUES (3, 3);
+INSERT INTO artist_album (artist_id, album_id) VALUES (3, 4);
+
+INSERT INTO track (title, album_id) VALUES ("Super Awesome Track 1", 1);
+INSERT INTO track (title, album_id) VALUES ("Super Awesome Track 2", 1);
+INSERT INTO track (title, album_id) VALUES ("Super Awesome Track 3", 1);
+INSERT INTO track (title, album_id) VALUES ("Super Awesome Track 4", 1);
+INSERT INTO track (title, album_id) VALUES ("Super Awesome Track 5", 1);
+
+INSERT INTO track (title, album_id) VALUES ("Super Funky Track 1", 2);
+INSERT INTO track (title, album_id) VALUES ("Super Funky Track 2", 2);
+INSERT INTO track (title, album_id) VALUES ("Super Funky Track 3", 2);
+INSERT INTO track (title, album_id) VALUES ("Super Funky Track 4", 2);
+
+INSERT INTO track (title, album_id) VALUES ("Super Disco Track 1", 3);
+INSERT INTO track (title, album_id) VALUES ("Super Disco Track 2", 3);
+INSERT INTO track (title, album_id) VALUES ("Super Disco Track 3", 3);
+
+INSERT INTO track (title, album_id) VALUES ("Super Hairband Track 1", 4);
+INSERT INTO track (title, album_id) VALUES ("Super Hairband Track 2", 4);
+INSERT INTO track (title, album_id) VALUES ("Super Hairband Track 3", 4);
+INSERT INTO track (title, album_id) VALUES ("Super Hairband Track 4", 4);
+INSERT INTO track (title, album_id) VALUES ("Super Hairband Track 5", 4);
+INSERT INTO track (title, album_id) VALUES ("Super Hairband Track 6", 4);
+INSERT INTO track (title, album_id) VALUES ("Super Hairband Track 7", 4);
+
+INSERT INTO track (title, album_id) VALUES ("Super Dubstep Track 1", 5);
+INSERT INTO track (title, album_id) VALUES ("Super Dubstep Track 2", 5);
+INSERT INTO track (title, album_id) VALUES ("Super Dubstep Track 3", 5);
+INSERT INTO track (title, album_id) VALUES ("Super Dubstep Track 4", 5);
+INSERT INTO track (title, album_id) VALUES ("Super Dubstep Track 5", 5);
+
+
+-- Show all tracks
+
+SELECT * FROM track;
+
+-- All albums between 1975 and 1990
+
+SELECT * FROM album WHERE release_year <= 1990 AND release_year >= 1975;
+SELECT * FROM album WHERE release_year BETWEEN 1975 AND 1990;
+
+-- All the start with "Super D"
+
+SELECT * FROM album WHERE title like 'Super D%';
+
+-- Same, with "any letter" instead of "p" in "Super
+
+SELECT * FROM album WHERE title like 'Su_er D%';
+
+-- Anything that ends with "Album"
+
+SELECT * FROM album WHERE title like '%Album';
+
+-- Anything with a "k" anywhere in the title
+
+SELECT * FROM album WHERE title like '%k%';
+
+-- All albums with no release year (NULL release_year)
+
+SELECT * FROM album WHERE release_year IS NULL;
+
+-- All tracks from Super Funky Album
+
+SELECT track.title
+    FROM track, album
+    WHERE track.album_id = album.id
+    AND album.title = "Super Funky Album";
+
+-- All tracks from all albums
+
+SELECT track.title FROM track, album WHERE track.album_id = album.id;
+
+-- Same, but also show album title
+
+SELECT track.title, album.title FROM track, album WHERE track.album_id = album.id;
+
+-- All album titles from artist Han Solo
+
+SELECT album.title
+    FROM album, artist_album, artist
+    WHERE artist_album.album_id = album.id
+    AND artist_album.artist_id = artist.id
+    AND artist.name = "Han Solo";
+
+-- Same, with subselects
+
+SELECT title FROM album WHERE id IN
+    (SELECT album_id FROM artist_album WHERE artist_id =
+        (SELECT id FROM artist WHERE name = "Han Solo"));
+
+-- Average of albums' release years
+
+SELECT AVG(release_year) FROM album;
+
+-- Same, since AVG ignores NULL rows
+
+SELECT AVG(release_year) FROM album WHERE release_year is not null;
+ase_year)
+
+-- Average release year for albums by Leia and the Ewoks
+
+SELECT AVG(release_year) FROM album, artist_album, artist
+    WHERE artist_album.artist_id = artist.id
+    AND artist_album.album_id = album.id
+    AND artist.name = "Leia and the Ewoks";
+
+-- Count of rows from artist with non-NULL id fields
+SELECT COUNT(id) FROM artist;
+
+-- Count of rows from artist, unconditionally
+SELECT COUNT(*) FROM artist;
+
+-- Count of rows from artist, renamed to "total"
+
+SELECT COUNT(*) AS total FROM artist;
+
+-- Count of tracks on Super Dubstep Album
+
+SELECT COUNT(*) FROM track, album
+	WHERE track.album_id = album.id
+	AND album.title = 'Super Dubstep Album';
+
+-- Count of album release years, not counting NULL entries
+
+SELECT count(release_year) FROM album;
+
+-- Example of NOT a SQL injection attack, when the user enters "beej"
+
+-- SELECT * FROM foo WHERE user = 'beej';
+
+-- Example of a SQL injection attack, when the user enters
+-- "beej'; DROP TABLE foo; --"
+
+-- SELECT * FROM foo WHERE user = 'beej'; DROP TABLE foo; --';

day1.sql

@@ -0,0 +1,97 @@
+-- Formatting
+
+    .mode column
+    .header on
+
+-- Enable Foreign Keys
+
+    PRAGMA foreign_keys = ON;
+
+-- Create Tables
+
+    CREATE TABLE album (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        title VARCHAR(128) NOT NULL,
+        release_year INTEGER
+    );
+
+    CREATE TABLE artist (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        name VARCHAR(128) NOT NULL
+    );
+
+    CREATE TABLE track (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    title VARCHAR(128) NOT NULL,
+    album_id   INTEGER, --foreign key
+    FOREIGN KEY (album_id) REFERENCES album (id)
+    );
+
+    CREATE TABLE artist_album (
+        artist_id INTEGER,
+        album_id INTEGER,
+        FOREIGN KEY(artist_id) REFERENCES artist(id),
+        FOREIGN KEY(album_id) REFERENCES album(id)
+    );
+
+-- Add Data
+
+    .read setup.db
+
+-- All albums
+
+    SELECT * FROM album
+
+-- All albums between 1975 and 1990
+
+    SELECT * FROM album WHERE release_year <= 1990 AND release_year >= 1975;
+    SELECT * FROM album WHERE release_year BETWEEN 1975 AND 1990;
+
+-- All the start with "Super D"
+
+    SELECT * FROM album WHERE title like 'Super D%';
+
+-- All albums with no release date
+
+    SELECT * FROM album WHERE release_year is NULL;
+
+-- All tracks from Super Funky Album
+
+    SELECT track.title
+        FROM track, album
+        WHERE track.album_id = album.id
+        AND album.title = "Super Funky Album";
+
+-- Same query as above, but rename the column from title to Track_Title in the output.
+
+    SELECT track.title AS Track_Title
+        FROM track, album
+        WHERE track.album_id = album.id
+        AND album.title = "Super Funky Album";
+
+-- All album titles from artist Han Solo
+
+    SELECT album.title
+        FROM album, artist_album, artist
+        WHERE artist_album.album_id = album.id
+        AND artist_album.artist_id = artist.id
+        AND artist.name = "Han Solo";
+
+-- Average of albums' release years
+
+    SELECT AVG(release_year) FROM album;
+
+-- Average release year for albums by Leia and the Ewoks
+
+    SELECT AVG(release_year) FROM album, artist_album, artist
+        WHERE artist_album.artist_id = artist.id
+        AND artist_album.album_id = album.id
+        AND artist.name = "Leia and the Ewoks";
+
+-- Count artists
+
+    SELECT COUNT(*) FROM artist;
+
+-- Count of tracks on Super Dubstep Album
+
+    SELECT COUNT(*) FROM track, album WHERE track.album_id = album.id AND album.title = 'Super Dubstep Album';  

day2.sql

@@ -0,0 +1,48 @@
+-- Formatting
+
+    .mode column
+    .header on
+
+-- Enable Foreign Keys
+
+    PRAGMA foreign_keys = ON;
+
+-- Create Tables
+
+    create table author (
+    id integer primary key autoincrement,
+    name varchar(128) not null
+    );
+
+    create table note (
+    id integer primary key autoincrement,
+    title varchar(128) not null,
+    content varchar(1024),
+    created_on datetime not null default(date('now')),
+    author_id integer references author(id)
+    );
+
+-- Insert authors to the author table.
+
+    INSERT INTO author (name) VALUES ("First");
+    INSERT INTO author (name) VALUES ("Second");
+    INSERT INTO author (name) VALUES ("Third");
+    INSERT INTO note (title, content, author_id) values ('One', 'This is a first note', 1);
+    INSERT INTO note (title, content, author_id) values ('Two', 'This is a second note', 2);
+    INSERT INTO note (title, content, author_id) values ('Three', 'This is a third note', 3);
+
+-- Select all notes by an author's name.
+
+    SELECT * FROM note, author WHERE author_id = author.id AND author.id = 1;
+
+-- Select author for a particular note by note ID.
+
+    SELECT name FROM note, author WHERE note.author_id = author.id AND node.id = 1
+
+-- Select the names of all the authors along with the number of notes they each have.
+
+    SELECT name, COUNT(*) as "total" FROM note, author WHERE note.author_id = author.id GROUP BY author_id;
+
+-- Delete authors from the author table.
+
+    DELETE FROM author WHERE name = "Second";