Dynamic Pivot multiple columns in SQL Server

Question

I have a table like this

Id   Name   FromAddress   ToAddress
1    Joey      ABC          JKL
2    Joey      DEF          MNP
3    Joey      GHI          OQR
         


        

Answer 1

ok, I created a temp table to do some testing on. The solution requires an unpivot first. I recommend running with/without the extra test data to get a sense of some other behaviors that surround this solution -- the weirdness that comes with the MAX aggregation and lack of new rows that you might have expected when changing the value in 'name'.

GL. Hope it helps.

-------------------------
-- Some test data here
CREATE table #addresses ( Id int, Name varchar(5), FromAddress varchar(5), ToAddress varchar(5))
insert into #addresses(id, Name, FromAddress, ToAddress) Values
(1,'Joey', 'ABC', 'JKL')
, (2,'Joey', 'DEF', 'MNO')
, (3,'Joey', 'GHI', 'PQR')
, (4,'Spike', 'XXX', 'YYY')
, (1,'Spike', 'QQQ', 'RRR')

-------------------------
--  Solution starts here.  create a temp table and unpivot your data into it.
--  Your initial technique of does not work, PIVOT only supports one aggregation

CREATE table #unpvt(RowColCode varchar(20), vals varchar(20))
Insert into #unpvt
SELECT ColCode + '_' + Cast(ID as varchar(2)) as RowColCode, vals
FROM #addresses a
UNPIVOT
    (vals for ColCode in (Name,FromAddress,ToAddress)) c

-------------------------
--  Read the temp table for a column list

declare @ColList nvarchar(max)
set @ColList = STUFF((
    SELECT distinct ',[' + t.RowColCode + ']'
            FROM #unpvt t
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)'),1,1,'')


-------------------------
-- 're pivot' the data using your new column list

declare @qry varchar(max)
set @qry = '

select *
from
    #unpvt
    PIVOT(
    MAX(vals)
    FOR RowColCode in (' +@ColList +  ') 
    ) rslt
'


execute(@qry)