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SQL Max Record

Posted on 2014-03-18
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Last Modified: 2014-03-18
I have this query:
SELECT        pr.PartNum, pr.RevisionNum, pr.EffectiveDate, pr.PartNum + '*' + pr.RevisionNum AS PartNumRevisionNum
FROM            dbo.PartRev AS pr INNER JOIN
                             (SELECT        PartNum, MAX(EffectiveDate) AS maxeffdate
                               FROM            dbo.PartRev AS b
                               WHERE        (Approved = 1) AND (EffectiveDate <= GETDATE())
                               GROUP BY PartNum) AS b_1 ON b_1.PartNum = pr.PartNum AND b_1.maxeffdate = pr.EffectiveDate
WHERE        (pr.Approved = 1)

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It is returning:
1234 A 07-27-14
3456 B 08-12-14
4567 B 09-01-14
4567 C 09-01-14

I want it to return:
1234 A 07-27-14
3456 B 08-12-14
4567 C 09-01-14

How would I revise this to get this result.
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Question by:maverick0728
3 Comments
 
LVL 143

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by:Guy Hengel [angelIII / a3]
ID: 39937187
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sdstuber earned 2000 total points
ID: 39937189
SELECT partnum,
       revisionnum,
       effectivedate,
       partnum + '*' + pr.revisionnum AS partnumrevisionnum
  FROM (SELECT partnum,
               revisionnum,
               effectivedate,
               ROW_NUMBER() OVER(PARTITION BY partnum ORDER BY effectivedate) AS rn
          FROM dbo.partrev
         WHERE approved = 1 AND effectivedate <= getdate()) as x
 WHERE rn = 1
0
 
LVL 70

Expert Comment

by:Scott Pletcher
ID: 39937262
SELECT        pr.PartNum, pr.RevisionNum, pr.EffectiveDate, pr.PartNum + '*' + pr.RevisionNum AS PartNumRevisionNum
FROM            dbo.PartRev AS pr INNER JOIN
                             (SELECT        PartNum, MIN(EffectiveDate) AS maxeffdate
                               FROM            dbo.PartRev AS b
                               WHERE        (Approved = 1) AND (EffectiveDate <= GETDATE())
                               GROUP BY PartNum) AS b_1 ON b_1.PartNum = pr.PartNum AND b_1.maxeffdate = pr.EffectiveDate
WHERE        (pr.Approved = 1)
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