CASE Statement with a JOIN and GROUP BY - sql-server

Question

I'm trying to select the winners of a race from an event by the specific competition they entered, for example.
The competition table
competition_ID, eventss_ID, competitor_ID, stageName, roundNo, startTime, finisheTime, judges_ID
The eventss table
eventss_ID, eventsName, noOfStages, eventsDate, entryFee, venue_ID, judges_ID
The results I want are;
Event RoundNo competitior_ID Competiton Winner
swimming 1 COM101 1st Place
swimming 1 COM213 2nd Place
swimming 2 COM101 1st Place
swimming 2 COM234 2nd Place
golf 1 COM654 1st Place
golf 1 COM874 2nd Place
Query I tried:
SELECT *
,CASE
WHEN finshTime = (SELECT MIN(finshTime) FROM competition) THEN '1st Place'
WHEN finshTime = (SELECT MAX(finshTime) FROM competition) THEN '2nd Place'
ELSE 'Draw'
END [Competition Winner]
FROM competition
JOIN eventss on eventss.eventss_ID = competition.eventss_ID
GROUP BY competition.roundNo

Answer 1

This would probably work to produce the desired output but it's hard to tell without proper sample data.
; WITH CTE AS (
SELECT *
, ROW_NUMBER() OVER (PARTITION BY eventss_ID, roundNo ORDER BY finishTime) RN
FROM competition)
, CTE2 AS (
SELECT *
, CASE (SELECT finishTime FROM CTE WHERE RN = 1 AND eventss_ID = c.eventss_ID AND roundNo = c.roundNO) - (SELECT finishTime FROM CTE WHERE RN = 2 AND eventss_ID = c.eventss_ID AND roundNo = c.roundNO)
WHEN 0 THEN 'Draw'
ELSE CASE RN
WHEN 1 THEN '1st Place'
ELSE '2nd Place' END END Drawn
FROM CTE c
WHERE RN IN (1, 2))
SELECT e.eventsName [Event], CTE2.RoundNo, CTE2.competitor_ID, CTE2.Drawn [Competition Winner]
FROM eventss e
JOIN CTE2 ON CTE2.eventss_ID = e.eventss_ID
ORDER BY e.eventsName, CTE2.roundNo, CTE2.Drawn
Note: I'm making the assumption that "finishtime" is stored as TIME or DATETIME. If it's stored as something else, this won't work.
EDIT: In the case of more than two people tied for first place, or in the case of a tie for second place, this query should work...
; WITH CTE AS (
SELECT *
, ROW_NUMBER() OVER (PARTITION BY eventss_ID, roundNo ORDER BY finishTime) RN
FROM competition)
, tiesforfirst AS (
SELECT *
, '1st Place' Drawn
FROM CTE T
WHERE finishTime = (SELECT finishTime FROM CTE WHERE RN = 1 AND eventss_ID = T.eventss_ID AND roundNo = T.roundNo))
, tiesforsecond AS (
SELECT *
, '2nd Place' Drawn
FROM CTE T
WHERE finishTime = (SELECT finishTime FROM CTE WHERE RN = 2 AND eventss_ID = T.eventss_ID AND roundNo = T.roundNo)
AND (SELECT COUNT(*) FROM tiesforfirst WHERE eventss_ID = T.eventss_ID AND roundNo = T.roundNo) = 1)
SELECT e.eventsName [Event], tf.RoundNo, tf.competitor_ID
, CASE (SELECT COUNT(*) FROM tiesforfirst WHERE eventss_ID = tf.eventss_ID AND roundNo = tf.roundNo) WHEN 1 THEN tf.Drawn ELSE 'Drawn 1st' END [Competition Winner]
FROM eventss e
JOIN tiesforfirst tf ON tf.eventss_ID = e.eventss_ID
UNION
SELECT e.eventsName [Event], tf.RoundNo, tf.competitor_ID
, CASE (SELECT COUNT(*) FROM tiesforsecond WHERE eventss_ID = tf.eventss_ID AND roundNo = tf.roundNo) WHEN 1 THEN tf.Drawn ELSE 'Drawn 2nd' END [Competition Winner]
FROM eventss e
JOIN tiesforsecond tf ON tf.eventss_ID = e.eventss_ID
ORDER BY e.eventsName, roundNo