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CREATE TABLE temp (`beverage` VARCHAR(5), `country` VARCHAR(2), `units_a_sold` INTEGER, `units_b_sold` INTEGER); INSERT INTO temp (`beverage`, `country`, `units_a_sold`, `units_b_sold`) VALUES ('fanta', 'US', '184', '209'), ('fanta', 'DE', '0', '400'), ('fanta', 'UK', '309', '107'), ('pepsi', 'US', '0', '890'), ('pepsi', 'DE', '0', '345'), ('pepsi', 'UK', '0', '193');
Records: 6 Duplicates: 0 Warnings: 0
SELECT DISTINCT beverage, CASE WHEN MAX(units_a_sold) OVER (PARTITION BY beverage) > 0 THEN FIRST_VALUE(country) OVER (PARTITION BY beverage ORDER BY units_a_sold DESC) ELSE FIRST_VALUE(country) OVER (PARTITION BY beverage ORDER BY units_b_sold DESC) END country FROM temp;
beverage
country
fanta
UK
pepsi
US