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nested/sub query in sql

Posted on 2013-11-07
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Last Modified: 2013-11-07
Hi I have two tables, one called vwApplicationCurrent and one called vwApplicationCategoryCurrent.  The tables are a one-many relationship based on Ref no.  There can be many Categories assigned to one Application.

I am trying to find the most recent Application Category (would be the row with the max CatAllocationDate) and return the Category Code along with other fields as shown below.

I am a newbie to SQL and am thinking this should be simple but just can't get it.   Here is the sample bit of data

TABLENAME vwApplicationCurrent            
RefNo      ApplicationDate      CurrentApplication
2063      31/10/2013      Yes
            
            
TABLENAME vwApplicationCategoryCurrent            
RefNo      CatCode      CatAllocationDate
2063      BN      25/08/2013
2063      NO      26/08/2013
2063      ME      27/08/2013


I am therefore looking to return the following from my view/sql statement:
RefNo       ApplicationDate    CatCode    CatAllocationDate    CurentApplication
2063         31/10/2013           ME               27/08/2013               Yes

Many thanks in advance.
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Question by:deborahhowson00
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Louis01 earned 2000 total points
ID: 39629650
select ac.RefNo, ac.ApplicationDate, acc1.CatCode, acc1.CatAllocationDate, ac.CurrentApplication
  from vwApplicationCurrent ac
        left outer join vwApplicationCategoryCurrent acc1
    on ac.RefNo = acc1.RefNo
   and acc1.CatAllocationDate = (select MAX(acc2.CatAllocationDate) 
                                  from vwApplicationCategoryCurrent acc2
                                 where acc1.RefNo = acc2.RefNo)

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Author Closing Comment

by:deborahhowson00
ID: 39629741
Super thank you very much! :)
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