Sad,

> 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';
> ?

Not a lot.  Why don't you try it?

-- 
-Josh Berkus
 Aglio Database Solutions
 San Francisco


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