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------------------
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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on a.SNumber=b.SNumber
set a.P1=b.GIndex
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