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insert into des_table 
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select * from database2.dbo.table2 b where not exsits (select 1 from database1.dbo.table1 where col1= b.col1 and col2=b.col2 and...)

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insert into des_table
select * from database1.dbo.table1 a where not exsits (select 1 from database2.dbo.table2 where col1= a.col1 and col2=a.col2 and...)
union all
select * from database2.dbo.table2 b where not exsits (select 1 from database1.dbo.table1 where col1= b.col1 and col2=b.col2 and...)

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