Reigning weightlifting champions
A reigning champion is a champion who's won both the previous and current years' competitions. To determine if a champion is reigning, the previous and current years' results need to be in the same row, in two different columns.
This exercise is part of the course
PostgreSQL Summary Stats and Window Functions
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
SELECT
-- Return each year's champions' countries
___,
___ AS champion
FROM Summer_Medals
WHERE
Discipline = 'Weightlifting' AND
Event = '69KG' AND
Gender = 'Men' AND
Medal = ___;