Makes sense! So, if I get you right, you've got something like this ...
Tbl2 Field1 Field2
==== ====== ======
"John Doe" "123-456-7890"
"John Doe" "123-456-7890"
"Jane Doe" "123-456-7890"
you want to insert into Tbl1 the following ...
Tbl1 Field1 Field2
==== ====== ======
"John Doe" "123-456-7890"
"Jane Doe" "123-456-7890"
If so, using distinct, group by, or Max/Min will not work as you would first think.
You'd be better off using some join coupled with exists, not in, or other exclusitory logic.