Rich Hickey (of [Clojure][1] fame) has released a cloud-based database called [Datomic][2] that has some interesting properties.
Datomic is an log of assertions and retractions of "facts", much as a DVCS like [Git][3] is a log of code diffs. The state of the database at any one time is the sum of all the assertions and retractions up to that date.
| /** | |
| * USB HID Keyboard scan codes as per USB spec 1.11 | |
| * plus some additional codes | |
| * | |
| * Created by MightyPork, 2016 | |
| * Public domain | |
| * | |
| * Adapted from: | |
| * https://source.android.com/devices/input/keyboard-devices.html | |
| */ |
| -- Sierpinski's Triangle. | |
| WITH points AS ( | |
| SELECT ROW, col FROM generate_series(0, 63) a(ROW) | |
| CROSS JOIN generate_series(0, 63) b(col) | |
| ORDER BY ROW DESC, col ASC | |
| ), marked_points AS ( | |
| SELECT ROW, col, (CASE WHEN ROW & col != 0 | |
| THEN ' ' | |
| ELSE '*' | |
| END) AS marker |