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SELECT TOP 1

AVG(main.age) AS _Average,min(main.age) AS _Min,

CASE WHEN %vid = count(main.age)/2 THEN main.age else 0 END+MAX(CASE WHEN %vid = count(main.age)/2 THEN main.age else 0 END) AS _Median,

max(main.age) AS _Max

FROM ( SELECT TOP all a.Age FROM Sample.Person a ORDER BY a.Age ) main

I happened to need Median recently and came up with this solution.

SELECT TOP 1
    AVG(main.age) AS _Average,min(main.age) AS _Min,
    CASE WHEN %vid = count(main.age)/2 THEN main.age else 0 END+MAX(CASE WHEN %vid = count(main.age)/2 THEN main.age else 0 END) AS  _Median,
    max(main.age) AS _Max
FROM
(
SELECT TOP all a.Age FROM Sample.Person a
ORDER BY a.Age
) main

And my 2 cents ..........

 

WHERE 
datediff(year,
todate(to_char(dgi.Birthdate,'YYYY')||':1','YYYY:MM'),
todate(to_char(current_date,'YYYY')||':1','YYYY:MM')
) >= 13

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