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update table1 T1
set T1.f = (select T2.f
from table2 T2
where T2.a= T1.a)
WHERE T1.a in (select T2.a from table T2)
set T1.f = (select T2.f
from table2 T2
where T2.a= T1.a)
WHERE T1.a in (select T2.a from table T2)
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