PostgreSQL Example – How to Create Stack Tables

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Stack Tables

Create Table Of Elves

- Create table called elves
CREATE TABLE elves (
    - string variable
    name varchar(255),
    - integer variable
    age int,
    - string variable
    race varchar(255),
    - string variable
    weapon varchar(255)
)

Create Table Of Dwarves


- Create table called dwarves
CREATE TABLE dwarves (
    - string variable
    name varchar(255),
    - integer variable
    age int,
    - string variable
    race varchar(255),
    - string variable
    weapon varchar(255)
)

Insert Rows Into Elf Table


INSERT INTO elves (name, age, race, weapon)
VALUES ('Dallar Woodfoot', 25, 'Elf', 'Bow'),
       ('Cordin Garner', 29, 'Elf', 'Bow'),
       ('Keat Knigh', 24, 'Elf', 'Sword'),
       ('Colbat Nalor', 124, 'Elf', 'Magic')

Insert Rows Into Dwarf Table


INSERT INTO dwarves (name, age, race, weapon)
VALUES ('Kalog', 23, 'Dwarf', 'Axe'),
       ('Dranar', 145, 'Dwarf', 'Bow'),
       ('Bratar', 12, 'Dwarf', 'Axe'),
       ('Dragga', 23, 'Dwarf', 'Axe')

Stack Tables On Top Of Eachother


- All rows from elf table
SELECT * FROM elves
- Stack on top of...
UNION ALL
- All rows from dwarf table
SELECT * FROM dwarves
name age race weapon
Dallar Woodfoot 25 Elf Bow
Cordin Garner 29 Elf Bow
Keat Knigh 24 Elf Sword
Colbat Nalor 124 Elf Magic
Kalog 23 Dwarf Axe
Dranar 145 Dwarf Bow
Bratar 12 Dwarf Axe
Dragga 23 Dwarf Axe

Python Example for Beginners

Two Machine Learning Fields

There are two sides to machine learning:

  • Practical Machine Learning:This is about querying databases, cleaning data, writing scripts to transform data and gluing algorithm and libraries together and writing custom code to squeeze reliable answers from data to satisfy difficult and ill defined questions. It’s the mess of reality.
  • Theoretical Machine Learning: This is about math and abstraction and idealized scenarios and limits and beauty and informing what is possible. It is a whole lot neater and cleaner and removed from the mess of reality.

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