SELECT A.barcode FROM shops A WHERE A.shop_id IN (1, 2);

would seem to do what you want, if not please explain more fully


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Nick
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-----Original Message-----
From: firebird-support@yahoogroups.com
[mailto:firebird-support@yahoogroups.com] On Behalf Of Damir Tesanovic
Sent: 05 February 2006 02:55
To: firebird-support@yahoogroups.com
Subject: [firebird-support] Self join


Hi!
I have a one table containing:
shop_id, barcode, amount
1, 12345, 54
1, 12346, 34
1, 34234, 23
2, 12345, 32
2, 10000, 12
3, 43245, 2

I tryed with
SELECT A.barcode, B.barcode FROM shops A LEFT JOIN shops B ON (A.barcode =
B.barcode) WHERE A.shop_id = 1 AND B.shop_id = 2;
command to get all barcodes from shop 1 and those from shop 2 even if there
is not pair but it doesn't work. Am I missing something?

Damir


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