Add Column

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

Add A Column

-- Alter the SUPERHEROES table by...
ALTER TABLE IF EXISTS SUPERHEROES 
-- Adding a column called WEAPON that allows for 100 characters with the default value of "Fists"
ADD COLUMN WEAPON VARCHAR(100) DEFAULT 'Fists'
;

View Table Of Superheroes

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