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You have to update only those records that have matching record. Whenever
we need to do this kind of updates, we duplicate select used in SET
section in where clause section. Try following SQL.
update tstmis/actfile a
set umnum = (select substring(digits(umnum),6,4)
from tstmis/shactfile b where a.umact = b.umact and b.umnum > 0 and
a.umnum = 0 )
where exists
(select 1
from tstmis/shactfile b where a.umact = b.umact and b.umnum > 0 and
a.umnum = 0 )
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