Bee Choeung

Day1_Answers.md

@@ -0,0 +1,56 @@
+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 NOT NULL,
+    FOREIGN KEY(album_id) REFERENCES album(id)
+);
+
+CREATE TABLE artist_albums (
+    artist_id INTEGER,
+    album_id INTEGER,
+    FOREIGN KEY(artist_id) REFERENCES artist(id),
+    FOREIGN KEY(album_id) REFERENCES album(id)
+);
+
+SELECT * FROM album;
+
+SELECT * FROM album WHERE release_year >= 1975 AND release_year < 1990;
+
+SELECT * FROM album WHERE title LIKE "Super D%";
+
+SELECT * FROM album WHERE release_year IS NULL;
+
+SELECT track.title FROM track, album
+    WHERE track.album_id = album.id AND album.title = "Super Funky Album";
+
+SELECT track.title AS "Track Title" FROM track, album
+    WHERE track.album_id = album.id AND album.title = "Super Funky Album";
+
+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";
+
+SELECT AVG(release_year) FROM album;
+
+SELECT AVG(release_year) FROM album, artist_album, artist
+    WHERE artist_album.album_id = album.id AND
+    artist_album.artist_id = artist.id AND
+    artist.name = "Leia and the Ewoks";
+
+SELECT COUNT(*) FROM artist;
+
+SELECT COUNT(*) FROM track, album
+    WHERE track.album_id = album.id AND
+    album.title = "Super Dubstep Album";

README.md

@@ -1,12 +1,13 @@
 # SQL
 
+
 See [the Lambda page on Relational
 Databases](https://github.com/LambdaSchool/Relational-Databases) for more
 information. (Note that page is for PostgreSQL, but the SQL information is valid
 here.)
 
 ## SQLite
-
+sql
 SQLite is a popular, simple SQL database.
 
 You can launch into a memory-only DB by running:

notes.sql

@@ -0,0 +1,46 @@
+PRAGMA foreign_keys = ON;
+
+DROP TABLE IF EXISTS note;
+DROP TABLE IF EXISTS author;
+
+CREATE TABLE note (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    author_id INTEGER,
+    title VARCHAR(128),
+    content TEXT,
+    created_on DATETIME,
+    FOREIGN KEY(author_id) REFERENCES author(id) ON DELETE CASCADE
+); 
+
+CREATE TABLE author (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name VARCHAR(128)
+);
+
+INSERT INTO author (name) VALUES ("Author Name 1");
+INSERT INTO author (name) VALUES ("Author Name 2");
+INSERT INTO author (name) VALUES ("Author Name 3");
+INSERT INTO author (name) VALUES ("Author Name 4");
+INSERT INTO author (name) VALUES ("Author Name 5");
+
+INSERT INTO note (author_id, title, content, created_on) VALUES (1, "Author 1 Note 1", "A1N1 Content", CURRENT_TIMESTAMP);
+INSERT INTO note (author_id, title, content, created_on) VALUES (1, "Author 1 Note 2", "A1N2 Content", CURRENT_TIMESTAMP);
+INSERT INTO note (author_id, title, content, created_on) VALUES (3, "Author 3 Note 1", "A3N1 Content", CURRENT_TIMESTAMP);
+INSERT INTO note (author_id, title, content, created_on) VALUES (4, "Author 4 Note 1", "A4N1 Content", CURRENT_TIMESTAMP);
+INSERT INTO note (author_id, title, content, created_on) VALUES (5, "Author 5 Note 1", "A5N1 Content", CURRENT_TIMESTAMP);
+INSERT INTO note (author_id, title, content, created_on) VALUES (5, "Author 5 Note 2", "A5N2 Content", CURRENT_TIMESTAMP);
+INSERT INTO note (author_id, title, content, created_on) VALUES (5, "Author 5 Note 3", "A5N3 Content", CURRENT_TIMESTAMP);
+
+SELECT title, content FROM note, author
+    WHERE note.author_id = author.id AND
+    author.name = "Author Name 5";
+
+SELECT name FROM note, author
+    WHERE note.author_id = author.id AND
+    note.id = 6;
+
+SELECT name, COUNT(*) FROM note, author
+    WHERE note.author_id = author.id
+    GROUP BY author_id;
+
+DELETE FROM author WHERE id = 3;

setup.sql

@@ -1,3 +1,28 @@
+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 NOT NULL,
+    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)
+);
+
 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);