Re: SQL: Join file 1 and 2, but only if not in 3

In the example from Rob you should change EXISTS by IN:
SELECT
T02.ITNBR, T02.STID, T02.ITRV, T02.ITDSC,
T02.UNMSR, T02.QCTYP, T02.QCDAY, T02.INTYP, T02.BLCF, T02.ALLOC
FROM WHDTA/SHRITMS T01,
JOIN AMFLIB1/ITMRVA T02 ON T01.ITNBR = T02.ITNBR
WHERE STID = 'H1P' and t02.itnbr not IN
(select itnbr from itemhist)
ORDER BY T02.ITNBR ASC, T02.ITRV ASC

Or maybe:
SELECT
T02.ITNBR, T02.STID, T02.ITRV, T02.ITDSC,
T02.UNMSR, T02.QCTYP, T02.QCDAY, T02.INTYP, T02.BLCF, T02.ALLOC
FROM WHDTA/SHRITMS T01,
JOIN AMFLIB1/ITMRVA T02 ON T01.ITNBR = T02.ITNBR
WHERE STID = 'H1P' and t02.itnbr not exists
(select * from itemhist T03 WHERE TO3.itnbr = TO1.itnbr)
ORDER BY T02.ITNBR ASC, T02.ITRV ASC

Instead, you will reach better performance with:
SELECT
T02.ITNBR, T02.STID, T02.ITRV, T02.ITDSC,
T02.UNMSR, T02.QCTYP, T02.QCDAY, T02.INTYP, T02.BLCF, T02.ALLOC
FROM WHDTA/SHRITMS T01,
JOIN AMFLIB1/ITMRVA T02 ON T01.ITNBR = T02.ITNBR
LEFT EXCEPTION JOIN ITEMHIST TO3 ON TO3.ITNBR = TO1.ITNBR
WHERE STID = 'H1P'
ORDER BY T02.ITNBR ASC, T02.ITRV ASC


Saludos,
---------------------------
Santiago Martí
Dusen, S.A.
---------------------------




Thanks Rob for the tip and the help on the code.

I am trying it but my SQL Interactive Session does not like the keyword
EXISTS ...

PETER VIDAL
MAPICS IT TECHNICAL SUPPORT TEAM / SR SYSTEM ANALYST
10540 Ridge Rd., Suite 203, New Port Richey, FL 34654-5111
Tel:727-849-9999, x2414 /// Fax:727-815-3120
WWW.PALL.COM

"Do not turn back when you are just at the goal."
Publilius Syrus (~100 BC), Maxims

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