Appending non-duplicate (single column ID) rows to a main table without creating a new table?

[#1]

Scenario: need to append daily survey data files (that include all previous days) to a main table with only non-duplicative respondent ID records and without creating a new table (because I do not want to lose selected rows in the main table that are hidden or exluded

Two attempts:

Concatenate mainains the main table but brings over all records

Join brings only the new records but creates a new table so row characteristics (hide, exlcude) are lost

[#2]

Excellent!!!

What got me confused was this line:

     Parse( "Col Min( Row(), :Name(\!"" || Concat Items( dt << get column names( string ), "\!"), :Name(\!"" ) || "\!"))" );

I couldn't figure out what the "Row()" in the first argument did.

Thank you very much.