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Do you need to qualify each table TA, TB, TC and use TA.mykey?

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles Wilt
Sent: Thursday, October 16, 2014 2:18 PM
To: Midrange Systems Technical Discussion
Subject: SQL0203 - Name xxxx is ambiguous, when using JOIN USING

I'm getting SQL0203 - Name MYKEY is ambiguous with the following:

select mykey, flda, fldb, fldc
from tbla
join tblb using (mykey)
join tblc using (mykey)
^---cursor positioned here...

I've tried adding parens (in various places), but get the same error.

CREATE TABLE QTEMP/TBLA (MYKEY CHAR (10 ) NOT NULL WITH DEFAULT, FLDA CHAR (10 ) NOT NULL WITH DEFAULT)

CREATE TABLE QTEMP/TBLB (MYKEY CHAR (10 ) NOT NULL WITH DEFAULT, FLDB CHAR (10 ) NOT NULL WITH DEFAULT)

CREATE TABLE QTEMP/TBLC (MYKEY CHAR (10 ) NOT NULL WITH DEFAULT, FLDC CHAR (10 ) NOT NULL WITH DEFAULT)

Running 7.1 TR6
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