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query syntax

Posted on 2015-02-23
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Last Modified: 2015-03-04
So now a follow up to a previous question!

I have the following query which i have grouped the measurements in to years and ranges.

PersonId is the identity of the patient.  Undersokningsdatum is a date, and U1MaximalIRAPDiameter is a measurement.

 What i really need now is to make sure i get all the empty rows.  That is for all the years i am interested in and for all the ranges.  How can i do that?

 with cte as(
 select
       PersonId , Undersokningsdatum , U1MaximalIRAPDiameter
 from (
       select
             PersonId , Undersokningsdatum , U1MaximalIRAPDiameter
           , ROW_NUMBER() OVER (PARTITION BY PersonId ORDER BY Undersokningsdatum DESC) AS RN
       from (
             select PersonId , Undersokningsdatum , U1MaximalIRAPDiameter
             from SweAAABas where Approved = 1 and U1Data = 1 and U1MaximalIRAPDiameter is not null
             union ALL
             select PersonId , Undersokningsdatum , U1MaximalIRAPDiameter
             from SweAAAFollowUp where Approved = 1 and U1Data = 1 and U1MaximalIRAPDiameter is not null
             ) AS SQA
       ) AS SQB
 where rn = 1
 )


 select 
   Year(t.Undersokningsdatum) as År,
   t.Aneurys as [Aneurys],
   count(t.Aneurys) as [Antal]
 from 
 (
   select Undersokningsdatum,
     case 
     when U1MaximalIRAPDiameter < 25 then '<25'
     when U1MaximalIRAPDiameter < 30 then '<30' 
     when U1MaximalIRAPDiameter < 35 then '<35' 
     when U1MaximalIRAPDiameter < 40 then '<40' 
     when U1MaximalIRAPDiameter < 45 then '<45' 
     when U1MaximalIRAPDiameter < 50 then '<50' 
     when U1MaximalIRAPDiameter < 55 then '<55' 
       else '>=55' end as Aneurys 
   from cte) t 
   
 group by  t.Aneurys, Year(Undersokningsdatum)
 order by  Year(Undersokningsdatum), t.Aneurys

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Question by:soozh
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Expert Comment

by:PortletPaul
ID: 40626934
Is there a table with ALL [PersonId] values, but only one row for each?
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Accepted Solution

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PortletPaul earned 500 total points
ID: 40627227
To produce a result that has every year for every person requires a cross join (Cartesian product).

let's assume
1. the range of years is 2013, 2014, 2015
2. the table [Persons] exists with a single row per person

then the overall query would look like this:

SELECT ... (list the columns)
FROM [Persons] AS P
CROSS JOIN  ( select 2013 as yr union all select 2014 union all select 2015 ) AS YRS
LEFT JOIN (
                      the query in the question here
                )  AS Q1
                   ON P.ID = Q1.personid AND yrs.yr = Q1.År

----------
If you do not have the equivalent of the assumed [Persons] table you could use a CTE of derived table instead e.g.

select distinct personid from [some-table-or-cte-here]

-----
If the range of years needed isn't known in advance that could also be made more flexible (e.g. by a recursive CTE).
If flexibility is not required just using constants and union all is fine.
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LVL 47

Expert Comment

by:Vitor Montalvão
ID: 40639273
soozh, you still have the issue or it's already solved?
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