CODEWITHSUNDEEP
sqlsql-servergreatest-n-per-grouptop-n
versionke
versionke

Reputation: 43

MSSQL Get max value from multiple columns by an ID

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.

Upvotes: 4

Views: 242

Answers (3)

Andomar
Andomar

Reputation: 238086

You can use row_number() to assign numbers within each (cid, narid) group. If you assign the row numbers ordered by nadate desc, aedate desc, the rows with row number 1 will be the rows you're looking for:

select  *
from    (
        select  row_number() over (
                    partiton by cid, narid
                    order by nadate desc, aedate desc) as rn
        ,       *
        from    YourTable
        ) as SubQueryAlias
where   rn = 1

Upvotes: 2

Gordon Linoff
Gordon Linoff

Reputation: 1269873

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.

Upvotes: 3

VJ Hil
VJ Hil

Reputation: 904

    WITH TEMP AS
        (    
        SELECT CID,NARID,MAX(NADATE)  AS TEMPDATE
        FROM TABLE
        GROUP BY CID,NARID
        )
    SELECT A.ID,A.CID,A.NARID,A.NATID,A.NADate,A.EID,MAX(A.AEDate)
      FROM TABLE A INNER JOIN TEMP 
    ON A.CID=TEMP.CID AND A.NARID=TEMP.NARID AND A.NADATE=TEMP.TEMPDATE
    GROUP BY A.ID,A.CID,A.NARID,A.NATID,A.NADate,A.EID;

Upvotes: 0

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