perfomance question

From: sad <sad(at)bankir(dot)ru>
To: pgsql-sql(at)postgresql(dot)org
Subject: perfomance question
Date: 2004-03-18 06:41:45
Message-ID: 200403180941.45591.sad@bankir.ru
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hello.

what are perfomance difference bitween
a) update t1 set f1 = 'x', f2 = 'y';
b) update t1 set f1 = 'x', f2 = f2;
c) update t1 set f1 = 'x';
?

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