perfomance question - Mailing list pgsql-sql

From sad
Subject perfomance question
Date
Msg-id 200403180941.45591.sad@bankir.ru
Whole thread Raw
Responses Re: perfomance question  (Josh Berkus <josh@agliodbs.com>)
List pgsql-sql
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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