การแก้ปัญหา CASE statements

-- Query from last exercise shown below.  Comment it out.
SELECT 
	sport,
    CASE WHEN weight/height^2*100 <.25 THEN '<.25'
    WHEN weight/height^2*100 <=.30 THEN '.25-.30'
    WHEN weight/height^2*100 >.30 THEN '>.30' END AS bmi_bucket,
    COUNT(DISTINCT athlete_id) AS athletes
FROM summer_games AS s
JOIN athletes AS a
ON s.athlete_id = a.id
GROUP BY sport, bmi_bucket
ORDER BY sport, athletes DESC;

-- Show height, weight, and bmi for all athletes
SELECT 
	____,
    ____,
    ____ AS bmi
FROM ____
-- Filter for NULL bmi values
WHERE ____;