Re: Joining to the same file twice

["Michael Naughton" <mnaughton@xxxxxxxxxxxx>]

Reeve, I think this will work:

select account, name, M1.sales, M2.service
from orders inner join master M1 on empno=M1.sales#
innner join master M2 on empno=M2.service#

(I think the M1 and M2 are called file "aliases", but I'm not sure.)

Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx> writes:
>I'm trying to join to a master file two times in the same record (once
>for 
>the sale rep's name; one for the tech's name).  The application will be 
>embedded SQL in an ILE RPG program.
>
>I can solve the problem by creating a logical with renamed fields :( but
>I'm 
>sure I've seen a way that doesn't require a external solution.
>
>This way (below) works but SQL tells me my subquery has an unqualified 
>correlation.  I don't know if that means the Programming Police will be 
>after me or if it's an indication of a potential performance problem.  I 
>could write a stored procedure but I think that's overkill.
>
>select account,name,
>(select sales    from master where empno=sales#),
>(select service from master where empno=service#) from orders
>
>thanks---


Mike Naughton
Senior Programmer/Analyst
Judd Wire, Inc.
124 Turnpike Road
Turners Falls, MA  01376
413-863-4357 x444
mnaughton@xxxxxxxxxxxx