Snowflake for Beginners – Swap Two Tables

Swap Two Tables

SWAP will swap all contents, metadata, and access permissions between two tables. This can be useful by allowing you to build a new version of the table over time and then when you are ready, swapping out the old verison for the new version.

Create Table Of Superheroes

- Create a table called SUPERHEROES. If it already exists, replace it.
CREATE OR REPLACE TABLE SUPERHEROES (
  - Column called ID allowing up to five characters
  "ID" VARCHAR(5), 
  - Column called NAME allowing up to 100 characters
  "NAME" VARCHAR(100),
  - Column called ALTER_EGO allowing up to 100 characters
  "ALTER_EGO" VARCHAR(100)
);

Insert Rows For Each Superhero

- Insert rows into SUPERHEROES
INSERT INTO SUPERHEROES 
    - With the values
    VALUES
    ('XF6K4', 'Chris Maki', 'The Bomber'),
    ('KD5SK', 'Donny Mav', 'Nuke Miner');

View Table Of Superheroes

- View the SUPERHEROES table
SELECT * FROM SUPERHEROES;
ID NAME ALTER_EGO
XF6K4 Chris Maki The Bomber
KD5SK Donny Mav Nuke Miner

Create Table Of Villans

- Create a table called VILLANS. If it already exists, replace it.
CREATE OR REPLACE TABLE VILLANS (
  - Column called ID allowing up to five characters
  "ID" VARCHAR(5), 
  - Column called NAME allowing up to 100 characters
  "NAME" VARCHAR(100),
  - Column called ALTER_EGO allowing up to 100 characters
  "ALTER_EGO" VARCHAR(100)
);

Insert Rows For Each Villan

- Insert rows into VILLANS
INSERT INTO VILLANS 
    - With the values
    VALUES
    ('KXD33', 'Millie Macoon', 'Slasher'),
    ('LKD92', 'Jason Jones', 'The Blade');

View Table Of Villans

- View the VILLANS table
SELECT * FROM VILLANS;
ID NAME ALTER_EGO
KXD33 Millie Macoon Slasher
LKD92 Jason Jones The Blade

Swap Superhero and Villan Tables

- Swap the SUPERHEROES and VILLANS tables
ALTER TABLE IF EXISTS SUPERHEROES SWAP WITH VILLANS;

View New Table Of Superheroes

- View the SUPERHEROES table
SELECT * FROM SUPERHEROES;
ID NAME ALTER_EGO
KXD33 Millie Macoon Slasher
LKD92 Jason Jones The Blade

View New Table Of Villans

- View the VILLANS table
SELECT * FROM VILLANS;
ID NAME ALTER_EGO
XF6K4 Chris Maki The Bomber
KD5SK Donny Mav Nuke Miner

 

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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