List Unique Customer Countries - Easy SQL Distinct Interview Problem

Problem

Your growth team wants to know every country where the business has customers. Using the customers table, return each distinct country in alphabetical order.

Schema

customers

column	type
id	INTEGER
name	TEXT
email	TEXT
country	TEXT

Sample Data

id	name	email	country
1	Alice	alice@example.com	USA
2	Bob	bob@example.com	Canada
3	Carol	carol@example.com	USA
4	Dave	dave@example.com	Germany

Expected Output

country
Canada
Germany
USA

Explanation

USA appears twice but is listed only once. The three distinct countries are sorted alphabetically.

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