As I have noticed this message appears if you try query like 

update table1 set a=table2.a where b=table2.b;

and there are 2 or more strings in table that contain the same "b". 

Aleksey.


Thu, 18 Jun 1998 12:56:13 +0300 (IDT)
Aleksey Dashevsky <postgres@luckynet.co.il>
Non-functional update, only first update is performed