You can also use associative array to compare the results IF you don't have decimals in your Column 1 and Column 2
Names Default To Here(1);
dt = New Table("Untitled",
Add Rows(3),
Compress File When Saved(1),
New Column("Column 1", Character, "Nominal", Set Values({"A", "B", "C"})),
New Column("Column 2", Character, "Nominal", Set Values({"AA", "B", "C"}))
);
dt << New Column("Diff", Numeric, Nominal, Formula(
As Constant(
aa1 = Associative Array(:Column 1);
aa2 = Associative Array(:Column 2);
aa1 << Remove(aa2);
N Items(aa1) > 0;
);
));
-Jarmo