16.20 - Example: Decoding IDs Using NULL - Advanced SQL Engine - Teradata Database

The following query

SELECT DECODE(country_id, 1, 'United States', 
                          2, 'England')
    FROM customers; 

returns:

• 'United States' if the country_id is 1
• 'England' if country_id is 2
• NULL if country_id isn't in the range 1 to 2