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SQL Syntax mulitple count columns

Posted on 2012-03-13
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Last Modified: 2012-03-13
I am trying to create a query that will list each item and then the number of times this item was sold with two yearly count columns. The first column needs to be the year 2011 and the second column needs to be 2012. How do I restructure this query to give the correct yearly totals. This script is close but for each line it repeats the same data 3 times.


select y1.itemnmbr,y1.ITEMDESC,y1.NumberPerYear as '2011',y2.NumberPerYear as '2012'
from SOP30300 sl
inner join SOP30200 sh on sl.SOPNUMBE=sh.SOPNUMBE and sl.SOPTYPE=sh.SOPTYPE
inner join
(
      select itemnmbr,itemdesc,COUNT(itemnmbr) as NumberPerYear
      from SOP30300 sl
      inner join SOP30200 sh on sl.SOPNUMBE=sh.SOPNUMBE and sl.SOPTYPE=sh.SOPTYPE
      where custnmbr='195' and sh.SOPTYPE=3 and YEAR(sh.docdate)=2011
      group by ITEMNMBR,ITEMDESC
) y1 on sl.itemnmbr= y1.itemnmbr
inner join
(
      select itemnmbr,COUNT(itemnmbr) as NumberPerYear
      from SOP30300 sl
      inner join SOP30200 sh on sl.SOPNUMBE=sh.SOPNUMBE and sl.SOPTYPE=sh.SOPTYPE
      where custnmbr='195' and sh.SOPTYPE=3 and YEAR(sh.docdate)=2012
      group by ITEMNMBR,ITEMDESC
) y2 on sl.itemnmbr= y2.itemnmbr
where custnmbr='195' and sh.SOPTYPE=3
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Question by:rwheeler23
2 Comments
 
LVL 25

Accepted Solution

by:
jogos earned 2000 total points
ID: 37717611
You can do that with only joining the table once

      select itemnmbr,itemdesc
      , sum(case when YEAR(sh.docdate)=2011 then 1 else 0 end ) as NumberPerYear2011
      , sum(case when YEAR(sh.docdate)=2012 then 1 else 0 end ) as NumberPerYear2012
      from SOP30300 sl 
      inner join SOP30200 sh on sl.SOPNUMBE=sh.SOPNUMBE and sl.SOPTYPE=sh.SOPTYPE
      where custnmbr='195' and sh.SOPTYPE=3 and YEAR(sh.docdate) in (2011,2012)
      group by ITEMNMBR,ITEMDESC

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Good reflex to doubt a sollution that has a repeating pattern.
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Author Closing Comment

by:rwheeler23
ID: 37717851
Excellent solution and advice. Thank you.
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