How To Select specific column As Row? - sql-server

Question

I have 2 tables Phone_record and customer
In my phone records tables I have two columns company_name and ModelNo
Now I want to show Company_name as my main column name
And in this column I want to show models of that company like this
Company 1 company2.....
Model1 model1
Model2 model2
How to write this query?

Answer 1

Here is a fully functional example of how you might do this.
if OBJECT_ID('tempdb..#Something') is not null
drop table #Something
create table #Something
(
ID int,
Subject1 varchar(50)
)
insert #Something
select 10868952, 'Some Subject' union all
select 10868952, 'Another one' union all
select 10868952, 'This Subject' union all
select 10868952, 'Science' union all
select 12345, 'My Subject'
declare #MaxCols int
declare #StaticPortion nvarchar(2000) =
'with OrderedResults as
(
select *, ROW_NUMBER() over(partition by ID order by Subject1) as RowNum
from #Something
)
select ID';
declare #DynamicPortion nvarchar(max) = '';
declare #FinalStaticPortion nvarchar(2000) = ' from OrderedResults Group by ID order by ID';
with E1(N) AS (select 1 from (values (1),(1),(1),(1),(1),(1),(1),(1),(1),(1))dt(n)),
E2(N) AS (SELECT 1 FROM E1 a, E1 b), --100 rows
cteTally(N) AS
(
SELECT ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E2
)
select #DynamicPortion = #DynamicPortion +
', MAX(Case when RowNum = ' + CAST(N as varchar(6)) + ' then Subject1 end) as Subject' + CAST(N as varchar(6)) + CHAR(10)
from cteTally t
where t.N <=
(
select top 1 Count(*)
from #Something
group by ID
order by COUNT(*) desc
)
--select #StaticPortion + #DynamicPortion + #FinalStaticPortion
declare #SqlToExecute nvarchar(max) = #StaticPortion + #DynamicPortion + #FinalStaticPortion;
exec sp_executesql #SqlToExecute