Python for Everybody Database Handout
/lectures3/Pythonlearn-15-Database-Handout.txt
Download and Install: http://sqlitebrowser.org/
Single Table SQL
CREATE TABLE "Users" ("name" TEXT, "email" TEXT)
INSERT INTO Users (name, email) VALUES ('Chuck', 'csev@umich.edu')
INSERT INTO Users (name, email) VALUES ('Colleen', 'cvl@umich.edu')
INSERT INTO Users (name, email) VALUES ('Ted', 'ted@umich.edu')
INSERT INTO Users (name, email) VALUES ('Sally', 'a1@umich.edu')
INSERT INTO Users (name, email) VALUES c('Ted', 'ted@umich.edu')
INSERT INTO Users (name, email) VALUES ('Kristen', 'kf@umich.edu')
DELETE FROM Users WHERE email='ted@umich.edu'
UPDATE Users SET name="Charles" WHERE email='csev@umich.edu'
SELECT * FROM Users
SELECT * FROM Users WHERE email='csev@umich.edu'
SELECT * FROM Users ORDER BY email
SELECT * FROM Users ORDER BY name DESC
Multi-Table SQL:
CREATE TABLE "Artist" (
"id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUE,
"name" TEXT)
CREATE TABLE "Album" (
"id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUE,
artist_id INTEGER,
"title" TEXT)
CREATE TABLE "Genre" (
"id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUE,
"name" TEXT)
CREATE TABLE "Track" (
"id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL UNIQUE,
album_id INTEGER, genre_id INTEGER, len INTEGER, rating INTEGER,
"title" TEXT, "count" INTEGER)
INSERT INTO Artist (name) VALUES ('Led Zepplin')
INSERT INTO Artist (name) VALUES ('AC/DC')
INSERT INTO Genre (name) VALUES ('Rock') ;
INSERT INTO Genre (name) VALUES ('Metal');
INSERT INTO Album (title, artist_id) VALUES ('Who Made Who', 2);
INSERT INTO Album (title, artist_id) VALUES ('IV', 1);
INSERT INTO Track (title, rating, len, count, album_id, genre_id)
VALUES ('Black Dog', 5, 297, 0, 2, 1) ;
INSERT INTO Track (title, rating, len, count, album_id, genre_id)
VALUES ('Stairway', 5, 482, 0, 2, 1) ;
INSERT INTO Track (title, rating, len, count, album_id, genre_id)
VALUES ('About to Rock', 5, 313, 0, 1, 2) ;
INSERT INTO Track (title, rating, len, count, album_id, genre_id)
VALUES ('Who Made Who', 5, 207, 0, 1, 2) ;
SELECT Album.title, Artist.name FROM Album JOIN Artist
ON Album.artist_id = Artist.id
SELECT Album.title, Album.artist_id, Artist.id, Artist.name
FROM Album JOIN Artist ON Album.artist_id = Artist.id
SELECT Track.title, Track.genre_id, Genre.id, Genre.name
FROM Track JOIN Genre
SELECT Track.title, Genre.name FROM Track JOIN Genre
ON Track.genre_id = Genre.id
SELECT Track.title, Artist.name, Album.title, Genre.name
FROM Track JOIN Genre JOIN Album JOIN Artist
ON Track.genre_id = Genre.id AND Track.album_id = Album.id
AND Album.artist_id = Artist.id
Many-Many Relationship
CREATE TABLE User (
id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
name TEXT UNIQUE,
email TEXT
) ;
CREATE TABLE Course (
id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
title TEXT UNIQUE
) ;
CREATE TABLE Member (
user_id INTEGER,
course_id INTEGER,
role INTEGER,
PRIMARY KEY (user_id, course_id)
) ;
INSERT INTO User (name, email) VALUES ('Jane', 'jane@tsugi.org');
INSERT INTO User (name, email) VALUES ('Ed', 'ed@tsugi.org');
INSERT INTO User (name, email) VALUES ('Sue', 'sue@tsugi.org');
INSERT INTO Course (title) VALUES ('Python');
INSERT INTO Course (title) VALUES ('SQL');
INSERT INTO Course (title) VALUES ('PHP');
INSERT INTO Member (user_id, course_id, role) VALUES (1, 1, 1);
INSERT INTO Member (user_id, course_id, role) VALUES (2, 1, 0);
INSERT INTO Member (user_id, course_id, role) VALUES (3, 1, 0);
INSERT INTO Member (user_id, course_id, role) VALUES (1, 2, 0);
INSERT INTO Member (user_id, course_id, role) VALUES (2, 2, 1);
INSERT INTO Member (user_id, course_id, role) VALUES (2, 3, 1);
INSERT INTO Member (user_id, course_id, role) VALUES (3, 3, 0);
SELECT User.name, Member.role, Course.title
FROM User JOIN Member JOIN Course
ON Member.user_id = User.id AND Member.course_id = Course.id
ORDER BY Course.title, Member.role DESC, User.name
"But I have only one disguise in the house--the old one." "How much is it, madame?" "9. Van Hoeyaerden, member of the Town Council. 121 Previous to his forty-ninth year, Plotinus wrote nothing. At that age he began to compose short essays on subjects which suggested themselves in the course of his oral teaching. During the next ten years, he produced twenty-one such278 papers, some of them only a page or two in length. At the end of that period, he made the acquaintance of his future editor and biographer, Porphyry, a young student of Semitic extraction, whose original name was Malchus. The two soon became fast friends; and whatever speculative differences at first divided them were quickly removed by an amicable controversy between Porphyry and another disciple named Amelius, which resulted in the unreserved adhesion of the former to the doctrine of their common master.415 The literary activity of Plotinus seems to have been powerfully stimulated by association with the more methodical mind of Porphyry. During the five years416 of their personal intercourse he produced nineteen essays, amounting altogether to three times the bulk of the former series. Eight shorter pieces followed during the period of failing health which preceded his death, Porphyry being at that time absent in Sicily, whither he had retired when suffering from the fit of depression already mentioned. He did not answer at once, but sat watching the trumpeter come out of the adjutant's office to sound recall. "Yes, she will marry," he agreed; "if no one else marries her, I will. I am as old as her father would have been but it would save telling some fellow about her birth." "You must get Mrs. Landor into the post to-morrow," Cairness said abruptly; "Victorio's band is about." The next day he left for the Circle K Ranch. Lawton did not appear to need help. But he fired a Greaser, nevertheless, and took Cairness on. He seemed to stand in as abject awe of Stone's note as an Arab might have stood of a bit of the black covering of the Kaabah stone. On the 9th of January, a month after their arrival, Lord Derwentwater was impeached of high treason by Mr. Lechmere in a bitter speech in the Commons. Other members, with equal acrimony, followed with impeachments against the Lords Widdrington, Nithsdale, Wintoun, Carnwath, Kenmure, and Nairn. The impeachments were carried up to the House of Lords on the same day, and on the 19th the accused noblemen were brought before the Peers, where they knelt at the bar until they were desired to rise by the Lord Chancellor, when, with the exception of Lord Wintoun, they confessed their guilt, and threw themselves on the mercy of the king. Sentence of death was immediately pronounced on those who had pleaded guilty; and Lord Wintoun was condemned after trial, but several months later he effected his escape from the Tower. Every effort was made to save the prisoners, and they were all reprieved, with the exception of Derwentwater, Kenmure, and Nithsdale. The first two were executed; but the Countess of Nithsdale, being about to take her leave of her husband, contrived, by introducing some friends, to secure his escape in female attire. Q, 200th Ind. Rush. Yours, Jim." "Reckon I can," said Albert good-naturedly, knowing that some day he might want his brother to do the same for him. "Lie there, dog!—there goes one of the accursed council!" and, springing up the step with a giant grasp, he seized the mitred chancellor by the neck, and dragged him forth into the centre of the church. HoME有没有泷泽萝拉的呀
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