##Introduction and Relational Databases
DBMS database managament systems
efficient - 1000s of queries/updates per second.
reliable - 99.9999%
convenient - physical data independence, abstraction from the details of how the data
/* | |
Arduino Yún Bridge example | |
This example for the Arduino Yún shows how to use the | |
Bridge library to access the digital and analog pins | |
on the board through REST calls. It demonstrates how | |
you can create your own API when using REST style | |
calls through the browser. | |
Possible commands created in this shetch: |
/* | |
Yún HTTP Client | |
This example for the Arduino Yún shows how create a basic | |
HTTP client that connects to the internet and downloads | |
content. In this case, you'll connect to the Arduino | |
website and download a version of the logo as ASCII text. | |
created by Tom igoe | |
May 2013 |
#include <Adafruit_GFX.h> | |
#include <Adafruit_NeoMatrix.h> | |
#include <Adafruit_NeoPixel.h> | |
#include <Bridge.h> | |
#include <HttpClient.h> | |
#define PIN 6 | |
Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(8, 8, 3, 1, PIN, | |
NEO_TILE_TOP + NEO_TILE_LEFT + NEO_TILE_ROWS + NEO_TILE_PROGRESSIVE + |
##Introduction and Relational Databases
DBMS database managament systems
efficient - 1000s of queries/updates per second.
reliable - 99.9999%
convenient - physical data independence, abstraction from the details of how the data
##Relational Algebra
formal language underpinning of SQL
operators select, project, join
queries (experessions) operate on relations and return relations
http://blog.trello.com/refining-the-way-we-structure-our-css-at-trello
use less
"I don’t know what I would do with loops and guards and math in CSS but I doubt it would be good."
mostly user: imports, data-uri, vars, shallow nesting, and mixins for vender-preftix