-- create a table
CREATE TABLE customer (
  id INTEGER PRIMARY KEY,
  name TEXT NOT NULL,
  country TEXT NOT NULL
);
-- insert some values
INSERT INTO customer VALUES (1, 'Rahul', 'Varanasi');
INSERT INTO customer VALUES (2, 'Justin', 'Germany');
INSERT INTO customer VALUES (3, 'Krish',  'United state of America');
INSERT INTO customer VALUES (4, 'Juli',   'Germany');
INSERT INTO customer VALUES (5,  'Ram', 'Varanasi');
INSERT INTO customer VALUES (6,  'Joe', 'United state of America');
-- fetch some values
SELECT DISTINCT country FROM Customer;