Comments on: Anti-Search patterns – SQL to look for what is NOT there – Part One

By: Lucas Jellema

Lucas Jellema — Wed, 22 Dec 2010 06:42:32 +0000

Hi Laurent,

Dirty trick or not - I like it!

thanks for the contribution to the collection.

Lucas

By: Laurent Schneider

Laurent Schneider — Mon, 20 Dec 2010 19:09:42 +0000

@Anton: did you try your query )
@lucas : without subquery, without join, with some dirty trick

create or replace type tn as table of number(4)
/

SELECT DISTINCT
CASE
WHEN empno NOT MEMBER OF
CAST (
COLLECT (DISTINCT mgr) OVER () AS tn
)
THEN ename
END ename
FROM emp
ORDER BY 1;

ENAME
———-
ADAMS
ALLEN
JAMES
MARTIN
MILLER
SMITH
TURNER
WARD

By: Timo Raitalaakso

Timo Raitalaakso — Mon, 20 Dec 2010 13:24:16 +0000

Do you actually get desired results with not in? s.mgr may be null.

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By: Anton Scheffer

Anton Scheffer — Mon, 20 Dec 2010 09:19:09 +0000

You missed, at least, one more way to find the managers without subordinates:
select enameÂ
fromÂ Â emp eÂ
whereÂ e.empno not in ( select s.mgr
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â fromÂ Â emp s
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â )