Selecting most recent data within several lines of data

[wilson@irco]

I have multiple lines of data (in date order sequence, date has its own
column) that relate to multiple part number., i.e.,

part no a - data line 1
part no a - data line 2
part no a - data line 3
part no b - data line 1
part no b - data line 2 etc, etc...

I would like to know the easiest way to select the most recent line of data
for each unique part no. Thanks.