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Median Function
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jerry



Joined: 31 Oct 2002
Posts: 3

Post Median Function Reply with quote

Is there a SQL median function like average

Thu Oct 31, 2002 4:12 pm View user's profile Send private message
jerry



Joined: 31 Oct 2002
Posts: 3

Post Re: Median Function Reply with quote

: Which database?

SQL Server

so T-SQL

Thu Oct 31, 2002 4:13 pm View user's profile Send private message
SysOp
Site Admin


Joined: 26 Nov 2006
Posts: 6508

Post Re: Median Function Reply with quote

This is taken from Joe Celko's "SQL FOR SMARTIES" book, second edition:

23.2.8 Celko's Third Median

... lots of stuff explaining things ..

SELECT AVG(DISTINCT weight)
FROM (SELECT P1.weight

FROM Parts AS P1, Parts AS P2

GROUP BY P1.pno, P1.weight

HAVING SUM(CASE WHEN P2.weight = P1.weight

THEN 1 ELSE 0 END)

>= ABS(SUM(CASE WHEN P2.weight P1.weight THEN -1

ELSE 0 END)))

AS Partitions;

If you prefer to use functions instead of a CASE expression, then use
this version of the query:

SELECT AVG(DISTINCT weight)
FROM (SELECT P1.weight

FROM Parts AS P1, Parts AS P2

GROUP BY P1.pno, P1.weight

HAVING SUM(ABS(1 - SIGN(P1.weight - P2.weight))

>= ABS(SUM(SIGN (P1.weight - P2.weight)))

AS Partitions;

Thu Oct 31, 2002 4:39 pm View user's profile Send private message
SysOp
Site Admin


Joined: 26 Nov 2006
Posts: 6508

Post Re: Median Function Reply with quote

No, not in T-SQL. Please see my answer for your previous question.

By the way, this is not a forum to post general SQL questions. Please use this forum for questions related to DB Tools, DB Mail and DB Audit software.

: Is there a SQL median function like average

Thu Oct 31, 2002 4:41 pm View user's profile Send private message
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