1. Week 3

2. Assignment
• 2 Part Assignment Patchwork and Narrative
• Patchwork:
– Somewhere to put it..
• Blogger / Wordpress / whatever
– Something to put there
• Screenshots, links of things we’ve done in class
• Links to cool things you’ve found
• And what do you honestly think about it?
– Start with your Facebook Gephi diagram?

3. Relational Databases
• Install MySQL
– XAMPP, MAMP, WAMP
• Last week we created databases from the
MySQL command prompt

4. Relational Databases
/Applications/MAMP/Library/bin/mysql --host=localhost -uroot –proot
• As many items as possible:
• Created a database
– create database 'test’;
– Use test;
– Create
– create table test( ID INT(5), TITLE VARCHAR(100) );
INSERT INTO test VALUES (5, “test”);
• I did it in php
• I got Bored
• Video:

5. PHP loop
set_time_limit(0);
error_reporting(E_ALL);
ini_set('display_errors', '1');
$db = new db();
$x = 2;
$number = 1;
$filename="/usr/share/dict/words";
$words=file($filename);
while ($x < 10) {
shuffle($words);
$word=$words[0];
$db->Query("INSERT INTO test (ID, Name) VALUE ($number, '$word')");
$number++;
}

6. 94 000 records in a few minutes

7. indexs
• Default index in mysql is a datastructure called
a b-tree
• When you create a primary key is creates a b-
tree
• Like an index in a book

8. BTREE EXAMPLE
http://www.youtube.com/watch?v=coRJrcIYbF
4
Helps to Speed up joins

9. Joining Tables –Shop Database
Create database shop;
use shop;
CREATE TABLE suppliers (
id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
supplier_name VARCHAR(100),
supplier_address VARCHAR(100)
);
CREATE TABLE products (
id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
prod_name VARCHAR(100),
prod_desc VARCHAR(100),
supplier_id INT
);

10. Shop Database
INSERT INTO suppliers (supplier_name, supplier_address)
VALUES
("Microsoft", "Microsoft Road") , ("Apple", "Apple Lane");
INSERT INTO products (prod_name, prod_desc, supplier_id)
VALUES
("iPhone", "Mobile Phone", "2") , ("Xbox 360", "Games Machine", "1");
select * from suppliers
select * from products
Select supplier_name, prod_name from suppliers, products;
SELECT prod_name, supplier_name, supplier_address FROM products, suppliers
WHERE (products.supplier_id = suppliers.id);
http://www.techotopia.com/index.php/Joining_Tables_in_MySQL

11. Relational Databases
collection of data items organized as a set of formally described tables

12. Relationships!

13. NoSQL databases (Not only SQL
• non-adherence to the widely used relational
database management system mode
– Document Stores
• Data stored in encodings such as XML, JSON etc
– Graph Database
– Key Value Store

14. Rows and Rows