Insert into Table1 (<column list>)
Select <columns> from Table2
WHERE <primary key column> NOT IN (select <primary key column> FROM Table1)
or
Insert into Table1 (<column list>)
Select <columns> from Table2
EXCEPT
Select <columns> from Table1
Roughly.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability