16.20 - Example: Decoding IDs When ID is Not Equal to 1, 2 or NULL - Advanced SQL Engine - Teradata Database

The following query:

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

returns:

• 'United States' if the country_id is 1
• 'England' if the country_id is 2
• NULL if the country_id is NULL
• NULL if the country_id is not equal to 1, 2, or NULL