sql - Date & Time in seperate columns, time in second format, how to get 'max datetime'? -

i faced getting latest (newest) record part, , way using "max date" approach.

here basic schema (and sample data):

lddate                  ldtime  ldpart          id 2010-10-26 00:00:00.000 52867   90-r6600-4100   186 2010-11-01 00:00:00.000 24634   90-r6600-4100   187 2010-11-24 00:00:00.000 58785   90-r6600-4100   194 2010-11-24 00:00:00.000 58771   90-r6600-4100   195 2010-11-17 00:00:00.000 29588   90-r6600-4100   201 2010-11-08 00:00:00.000 29196   90-r6600-4100   282 2010-11-08 00:00:00.000 29640   90-r6600-4100   290 2010-10-19 00:00:00.000 58695   90-r6600-4100   350 2010-09-22 00:00:00.000 32742   bh4354-f0       338 2010-09-22 00:00:00.000 32504   bh4354-f0       340 2010-11-17 00:00:00.000 31157   bh4354-f0       206 2010-11-08 00:00:00.000 27601   bh4354-f0       218 2010-11-08 00:00:00.000 27865   bh4354-f0       21 2010-09-22 00:00:00.000 23264   br6950-f0       70 2010-09-22 00:00:00.000 23270   br6950-f0       77 2010-09-24 00:00:00.000 27781   br6950-f0       97 2010-11-24 00:00:00.000 57735   br6950-f0       196 

what have above lddate no time, , ldtime not proper hh:mm:ss representation, seconds since midnight, first line be:

2010-10-26 00:00:00.000 52867 or if convert time:

52 867 seconds = 14.6852778 hours ~2010-10-26 14:68:52

is there clean way can combine both columns in sql query? want simple max(ldcombineddate) , group ldpart (part number).

the id, useless, ignore it, there right order record inserted, nothing else, used nested query maybe? note: order of entry not mean latest date...

thanks...

the expression

dateadd(second, ldtime, lddate) 

will return combined date. so, guess want this:

select ldpart, max(dateadd(second, ldtime, lddate)) maxcombineddate   yourtable  group ldpart