Anne Courtney

notes.sql

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+
+/* Create database for notes */
+CREATE TABLE author (id INTEGER PRIMARY KEY AUTOINCREMENT, first_name VARCHAR(200) NOT NULL, last_name VARCHAR(255) NOT NULL);
+CREATE TABLE note (id INTEGER PRIMARY KEY AUTOINCREMENT, title VARCHAR(200) NOT NULL, content VARCHAR(255) NOT NULL, author_id INT REFERENCES author(id), created_at datetime default current_timestamp, last_modified datetime default current_timestamp);
+
+
+/* add authors to database */
+INSERT INTO author (first_name, last_name) VALUES ("Anne", "Courtney");
+INSERT INTO author (first_name, last_name) VALUES ("Ryan", "Courtney");
+INSERT INTO author (first_name, last_name) VALUES ("Coraline", "Courtney");
+
+/* Add notes to database */
+INSERT into note (title, content, author_id) values ("Test 1", "testing testing", 1);
+INSERT into note (title, content, author_id) values ("Test 2", "testing again", 1);
+INSERT into note (title, content, author_id) values ("Test 3", "final test i promise", 2);
+INSERT into note (title, content, author_id) values ("Test 3", "final test i promise", 3);
+
+
+/* Select all notes by an author's name */
+SELECT note.title, note.content FROM note, author WHERE note.author_id = author.id AND author.first_name = "Anne";
+SELECT note.title, note.content FROM note, author WHERE note.author_id = author.id AND author.first_name = "Ryan";
+SELECT note.title, note.content FROM note, author WHERE note.author_id = author.id AND author.first_name = "Coraline";
+
+
+/* Select author for a particular note by note ID */
+SELECT author.first_name, author.last_name FROM note, author WHERE note.author_id = author.id AND note.id = 1;
+SELECT author.first_name, author.last_name FROM note, author WHERE note.author_id = author.id AND note.id = 2;
+SELECT author.first_name, author.last_name FROM note, author WHERE note.author_id = author.id AND note.id = 3;
+
+
+/* Select names of all the authors along with the number of notes they have */
+SELECT author.first_name, author.last_name, COUNT(author_id) FROM author, note WHERE note.author_id = author.id GROUP BY author.last_name;
+SELECT author.first_name, author.last_name, COUNT(author_id) FROM author, note WHERE note.author_id = author.id GROUP BY author.first_name;
+
+/* Delete authors from the author table */
+DELETE FROM author WHERE id=3;
+
+/* What happens when you try to delete an author with an existing note? */
+/* Foreign key constraint error - it does not allow you to delete. */
+/* Solution is changing the delete cascade */
+
+/* Step one for me was opening notes.db so that my foreign_key constraints were turned off - .open notes.db */
+begin transaction;
+alter table note rename to _note_old_;
+CREATE TABLE note (id INTEGER PRIMARY KEY AUTOINCREMENT, title VARCHAR(200) NOT NULL, content VARCHAR(255) NOT NULL, author_id INT REFERENCES author(id) ON DELETE CASCADE, created_at datetime default current_timestamp, last_modified datetime default current_timestamp);
+INSERT INTO note SELECT * from _note_old_;
+commit;
+.quit
+
+/* sqlite3 notes.db */
+drop table _note_old_;
+DELETE FROM author where author.id = 4;

track.sql

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+/*specify persistent DB file*/
+-- sqlite3 mydatabase.db
+
+-- PRAGMA foreign_keys = ON
+-- .mode COLUMNS
+-- .header 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, title VARCHAR(128) NOT NULL);
+CREATE TABLE track(id INTEGER PRIMARY KEY AUTOINCREMENT, title VARCHAR(128) NOT NULL, album_id INT REFERENCES album(id));
+CREATE TABLE artist_album(artist_id INT REFERENCES artist(id), album_id INT REFERENCES album(id));
+
+/*Populate tables*/
+.read setup.sql
+
+/* Show all albums */
+SELECT * from album;
+-- id          title                release_year
+-- ----------  -------------------  ------------
+-- 1           Super Awesome Album  1990
+-- 2           Super Funky Album
+-- 3           Super Disco Album    1978
+-- 4           Super Hairband Albu  1984
+-- 5           Super Dubstep Album
+
+/* Showing all albums made between 1975 and 1990 */
+SELECT * from album WHERE release_year < 1990 AND release_year > 1975;
+-- id          title              release_year
+-- ----------  -----------------  ------------
+-- 3           Super Disco Album  1978
+-- 4           Super Hairband Al  1984
+-- 8           Super Disco Album  1978
+-- 9           Super Hairband Al  1984
+
+/* Show all albums whose names start with Super D. */
+SELECT * from album WHERE title LIKE 'Super D%';
+-- id          title              release_year
+-- ----------  -----------------  ------------
+-- 3           Super Disco Album  1978
+-- 5           Super Dubstep Alb
+-- 8           Super Disco Album  1978
+
+/* Show all albums that have no release year */
+SELECT * from album WHERE release_year IS NULL;
+-- id          title              release_year
+-- ----------  -----------------  ------------
+-- 2           Super Funky Album
+-- 5           Super Dubstep Alb
+-- 7           Super Funky Album
+
+/* Show all track titles from Super Funky Album */
+SELECT track.title FROM track, album WHERE track.album_id = album.id AND album.title = 'Super Funky Album';
+            -- title
+            -- -------------------
+            -- Super Funky Track 1
+            -- Super Funky Track 2
+            -- Super Funky Track 3
+
+/* Show all track titles from Super Funky Album and change title to Track_Title in output */
+SELECT track.title AS Track_Title FROM track, album WHERE track.album_id = album.id AND album.title = 'Super Funky Album';
+/*  output:
+            Track_Title
+            -------------------
+            Super Funky Track 1
+            Super Funky Track 2
+            Super Funky Track 3
+
+/* Select all album titles by Han Solo */
+SELECT album.title FROM album, artist, artist_album WHERE artist.id = artist_album.artist_id AND album.id = artist_album.album_id AND artist.name = 'Han Solo';
+/*  output:
+            title
+            -----------------
+            Super Disco Album
+            Super Hairband Al       */
+
+/* Select the average year all albums were released */
+SELECT AVG(release_year) from album;
+/*  output:
+        avg(release_year)
+        -----------------
+        1984.0              */
+
+/* Select average year all albums by Leia and the Ewoks were released */
+SELECT AVG(release_year) FROM album, artist, artist_album WHERE artist.id = artist_album.artist_id AND album.id = artist_album.album_id AND artist.name = 'Leia and the Ewoks';
+/*  output:
+        AVG(release_year)
+        -----------------
+        1990.0              */
+
+/* Select the number of artists */
+SELECT COUNT(id) FROM artist;
+/*  output:
+        count(id)
+        ----------
+        3                   */
+
+/* Select the number of tracks on Super Dubstep Album */
+SELECT COUNT(track.id) FROM track, album WHERE album.id = track.album_id and album.title = 'Super Dubstep Album';
+/*  output:
+        COUNT(track.id)
+        ---------------
+        5               */