compare column a to b and b to a

[ayazgreat]

Yes these are values , real.example like
Col a
814090
814091
814092
818000
818001
818002
818003
910010
987012

Col b
814090
814092
814093
814095
818003
818004
818005
818009
818010
818011
910010
910011
910012
987761

The data of both columns are in 800,000 rows of each

[Rick Rothstein]

Yes these are values , real.example like
Col a
814090
814091
..........

Col b
814090
814092
..........

The data of both columns are in 800,000 rows of each

What is the minimum and maximum possible values in each column?