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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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
