MSSQL Get max value from multiple columns by an ID

Question

I've come across many similar posts on this but none I've found got this specific.

Here's my sample data:

ID      CID     NARID   NATID       NADate      EID     AEDate
1       1655    1       4           12/1/12     202     6/4/14 11:37:01
2       1655    1       7           12/1/12     202     6/4/14 11:37:12
5       1655    2       65          1/13/14     587     6/4/14 11:37:00
29      3165    1       6           4/15/14     7       6/4/14 11:37:00
300     3165    1       6           6/30/14     7       6/4/14 11:33:50
295     3165    2       64          6/11/14     7       6/4/14 11:37:00
302     3165    2       63          7/24/14     7       6/4/14 11:41:24
303     3165    2       67          7/24/14     7       6/4/14 15:59:06

I first am looking to get the max NADate for each CID & NARID:

ID      CID     NARID   NATID       NADate      EID     AEDate
1       1655    1       4           12/1/12     202     6/4/14 11:37:01
2       1655    1       7           12/1/12     202     6/4/14 11:37:12
5       1655    2       65          1/13/14     587     6/4/14 11:37:00
300     3165    1       6           6/30/14     7       6/4/14 11:33:50
302     3165    2       63          7/24/14     7       6/4/14 11:41:24
303     3165    2       67          7/24/14     7       6/4/14 15:59:06

Then from these results, get the record with the max AEDate (along with all other corresponding fields):

ID      CID     NARID   NATID       NADate      EID     AEDate
2       1655    1       7           12/1/12     202     6/4/14 11:37:12
5       1655    2       65          1/13/14     587     6/4/14 11:37:00
300     3165    1       6           6/30/14     7       6/4/14 11:33:50
303     3165    2       67          7/24/14     7       6/4/14 15:59:06

The database type is MSSQL 2005.

Answer 1

I think the easiest way is to use dense_rank():

select t.*
from (select t.*,
             dense_rank() over (partition by cid
                                order by nadate desc, cast(edate as date) desc
                               ) as seqnum
      from table t
     ) t
where seqnum = 1;

You need the cast(edate to date) so the query will be considering only the date portion of edate. You need the dense_rank() so the will return all rows on the most recent date.