Sql Server Pivot with multiple columns from a record

Question

I am using Sql Server 2014. I currently have a table which looks something like this:

labNumber   parameter   result  date
18897       Nitrate     <0      1/         


        

Answer 1

Considering you have just record per parameter, Here is one way using conditional aggregate

SELECT labNumber,
       Max(CASE WHEN parameter = 'Nitrate' THEN result END) AS nitate,
       Max(CASE WHEN parameter = 'Nitrate' THEN date END) nitateDate,
       Max(CASE WHEN parameter = 'Coliform' THEN result END) Coliform,
       Max(CASE WHEN parameter = 'Coliform' THEN date END) ColiformDate,
       Max(CASE WHEN parameter = 'Arsenic' THEN result END) Arsenic,
       Max(CASE WHEN parameter = 'Arsenic' THEN date END) ArsenicDate
FROM   yourtable
GROUP  BY labNumber 

Another approach by unpivoting and pivoting the data

SELECT labNumber,
       Nitrate,
       NitrateDate,
       Coliform,
       ColiformDate,
       Arsenic,
       ArsenicDate
FROM  (SELECT labNumber,
              intr,
              col
       FROM   Yourtable
              CROSS apply (VALUES (result,parameter),
                                  (convert(varchar(20),[date],120),parameter + 'Date')) cs(intr, col))a
      PIVOT (Max(intr)
            FOR col IN (Nitrate,
                        NitrateDate,
                        Coliform,
                        ColiformDate,
                        Arsenic,
                        ArsenicDate))pv