June 7 2016 pulladded all db assignments

Assignments/Assignment_16_1

@@ -0,0 +1,20 @@
+Instructions
+If you don't already have it, install the SQLite Browser from http://sqlitebrowser.org/.
+
+Then, create a SQLITE database or use an existing database and create a table in the database called "Ages":
+
+CREATE TABLE Ages ( 
+  name VARCHAR(128), 
+  age INTEGER
+)
+Then make sure the table is empty by deleting any rows that you previously inserted, and insert these rows and only these rows with the following commands:
+
+DELETE FROM Ages;
+INSERT INTO Ages (name, age) VALUES ('Malakhy', 37);
+INSERT INTO Ages (name, age) VALUES ('Marlee', 23);
+INSERT INTO Ages (name, age) VALUES ('Timucin', 18);
+INSERT INTO Ages (name, age) VALUES ('Anneroy', 17);
+Once the inserts are done, run the following SQL command:
+SELECT hex(name || age) AS X FROM Ages ORDER BY X
+Find the first row in the resulting record set and enter the long string that looks like 53656C696E613333.
+Note: This assignment must be done using SQLite - in particular, the SELECT query above will not work in any other database. So you cannot use MySQL or Oracle for this assignment.

Assignments/Assignment_16_2

@@ -0,0 +1,14 @@
+Counting Organizations
+This application will read the mailbox data (mbox.txt) count up the number email messages per organization (i.e. domain name of the email address) using a database with the following schema to maintain the counts.
+
+CREATE TABLE Counts (org TEXT, count INTEGER)
+When you have run the program on mbox.txt upload the resulting database file above for grading.
+If you run the program multiple times in testing or with dfferent files, make sure to empty out the data before each run.
+
+You can use this code as a starting point for your application: http://www.pythonlearn.com/code/emaildb.py.
+
+The data file for this application is the same as in previous assignments: http://www.pythonlearn.com/code/mbox.txt.
+
+Because the sample code is using an UPDATE statement and committing the results to the database as each record is read in the loop, it might take as long as a few minutes to process all the data. The commit insists on completely writing all the data to disk every time it is called.
+
+The program can be speeded up greatly by moving the commit operation outside of the loop. In any database program, there is a balance between the number of operations you execute between commits and the importance of not losing the results of operations that have not yet been committed.

Assignments/Assignment_17

@@ -0,0 +1,43 @@
+Musical Track Database
+This application will read an iTunes export file in XML and produce a properly normalized database with this structure:
+
+CREATE TABLE Artist (
+    id  INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
+    name    TEXT UNIQUE
+);
+
+CREATE TABLE Genre (
+    id  INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
+    name    TEXT UNIQUE
+);
+
+CREATE TABLE Album (
+    id  INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
+    artist_id  INTEGER,
+    title   TEXT UNIQUE
+);
+
+CREATE TABLE Track (
+    id  INTEGER NOT NULL PRIMARY KEY 
+        AUTOINCREMENT UNIQUE,
+    title TEXT  UNIQUE,
+    album_id  INTEGER,
+    genre_id  INTEGER,
+    len INTEGER, rating INTEGER, count INTEGER
+);
+If you run the program multiple times in testing or with different files, make sure to empty out the data before each run.
+
+You can use this code as a starting point for your application: http://www.pythonlearn.com/code/tracks.zip. The ZIP file contains the Library.xml file to be used for this assignment. You can export your own tracks from iTunes and create a database, but for the database that you turn in for this assignment, only use the Library.xml data that is provided.
+
+To grade this assignment, the program will run a query like this on your uploaded database and look for the data it expects to see:
+
+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
+    ORDER BY Artist.name LIMIT 3
+The expected result of this query on your database is:
+Track	Artist	Album	Genre
+Chase the Ace	AC/DC	Who Made Who	Rock
+D.T.	AC/DC	Who Made Who	Rock
+For Those About To Rock (We Salute You)	AC/DC	Who Made Who	Rock

Assignments/Assignment_18

@@ -0,0 +1,16 @@
+This application will read roster data in JSON format, parse the file, and then produce an SQLite database that contains a User, Course, and Member table and populate the tables from the data file.
+
+You can base your solution on this code: http://www.pythonlearn.com/code/roster.py - this code is incomplete as you need to modify the program to store the role column in the Member table to complete the assignment.
+
+Each student gets their own file for the assignment. Download this file (https://pr4e.dr-chuck.com/tsugi/mod/sql-intro/roster_data.php?PHPSESSID=3d72f3abd510051b658e7c284146cfb5) and save it as roster_data.json. Move the downloaded file into the same folder as your roster.py program.
+
+Once you have made the necessary changes to the program and it has been run successfully reading the above JSON data, run the following SQL command:
+
+
+SELECT hex(User.name || Course.title || Member.role ) AS X FROM 
+    User JOIN Member JOIN Course 
+    ON User.id = Member.user_id AND Member.course_id = Course.id
+    ORDER BY X
+
+
+Find the first row in the resulting record set and enter the long string that looks like 53656C696E613333.