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table1
------------------
SNumber p1


===================

table2
-------------------
SNumber GIndex

=================
update table1 set table1.P1=(select GIndex from table2 where table2.SNumber = table1.SNumber)  where  exists  (select  1  from  table2    where  table2.SNumber=table1.SNumber)

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update table1 a,table2 b
on a.SNumber=b.SNumber
set a.P1=b.GIndex 

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