Groups > comp.databases.ms-sqlserver > #334

Re: Query for record that is effective as of a certain date

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From	Erland Sommarskog <esquel@sommarskog.se>
Newsgroups	comp.databases.ms-sqlserver
Subject	Re: Query for record that is effective as of a certain date
Date	Mon, 16 May 2011 22:29:35 +0200
Organization	Erland Sommarskog
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BobRoyAce (broy@omegasoftwareinc.com) writes:
> How could I construct such a query? Is this something I could do with
> Select...Over...Partition By? I am not very familiar with that
> construct, but it seems that it might be relevant.
 
row_number is indeed your guy.

WITH numbered AS (
   SELECT fkLoanId, fkLoanStatusID, EffectiveDate,
          rowno = row_number() OVER (PARTITION BY fkLoanId
                                     ORDER BY EffectiveDate DESC)
   FROM   LoanStatusChanges
   WHERE  EffectiveDate <= @perdate
)
SELECT L.LoanNum, LS.LoanStatusDesc, n.EffectiveDate
FROM   numbered n
JOIN   Loans L ON n.LoanID = L.LoanID
JOIN   LoanStatuses LS ON n.LoanStatusID = LS.LoanStatusID
WHERE  rowno = 1



-- 
Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se

Links for SQL Server Books Online:
SQL 2008: http://msdn.microsoft.com/en-us/sqlserver/cc514207.aspx
SQL 2005: http://msdn.microsoft.com/en-us/sqlserver/bb895970.aspx

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Query for record that is effective as of a certain date BobRoyAce <broy@omegasoftwareinc.com> - 2011-05-16 09:49 -0700
  Re: Query for record that is effective as of a certain date Erland Sommarskog <esquel@sommarskog.se> - 2011-05-16 22:29 +0200
    Re: Query for record that is effective as of a certain date BobRoyAce <broy@omegasoftwareinc.com> - 2011-05-17 07:34 -0700

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