Re: SQL Join - all rows from any table for employee

If I'm understanding correctly, a LEFT JOIN should work in conjunction with
a GROUP BY and HAVING clause.

SELECT a.emp_id
FROM prmast AS a
LEFT JOIN dedbal AS b ON a.emp_id = b.emp_id
LEFT JOIN incbal AS c ON a.emp_id = c.emp_id
GROUP BY a.emp_id
HAVING (COUNT(a.emp_id) > 1)

That should work, but it is untested.

--
James R. Perkins


On Thu, Jun 10, 2010 at 12:38, Dennis Lovelady <iseries@xxxxxxxxxxxx> wrote:

We have three tables: DEDBAL, INCBAL, and PRMAST.



Each of these contains an employee number (DEDEMP, INCEMP, PREMP). We want
to produce output where an employee is represented in either DEDBAL and
INCBAL or both. (For the sake of argument, we can assume that PRMAST is
present for each employee).



I've tried various types of joins (LEFT OUTER, FULL, et cetera) and have
pored through the archives and GOOGLE and come up empty on a means of doing
this exactly right. (I'm convinced this is a common issue; so my issue is
probably my choice of search words - usually resulting in too many hits).
Would some kind soul mind directing me to guidelines on how to write the
JOIN for this challenge?



Thanks!



Dennis E. Lovelady
AIM/Skype: delovelady MSN: fastcounter@xxxxxxxxxxxx
<http://www.linkedin.com/in/dennislovelady>
www.linkedin.com/in/dennislovelady --
I am at one with my duality.



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