How can I sort Excel with 170,000 rows so duplicates are all together or the non-duplicates are hidden?

garbo74412017-01-25T13:53:09Z

Is all of your data in a single column, or do the duplicates occur in multiple columns across the rows? Do you actually wish to sort the data after hiding non duplicates?

Greywolf2017-01-25T12:18:58Z

Work out which columns contain dupiicates, then sort on those columns