SQL Select COLUMNS in a single row with inner join - sql

Question

Hi I am having problem with selecting my desired output in my program.
Here's the scenario:
I have 2 tables
_Users
_Mobiles
Lets say I have these fields and data in each tables:
_Users
**UserID** **Name**
1 John
2 Mark
_Mobiles
**UserID** **Mobile**
1 44897065
1 44897066
1 44897067
2 45789071
What I know is that I can use
Select a.UserID, b.Mobile
from _Users a INNER JOIN
_Mobiles b ON a.UserID = b.UserID
where UserID = 1
which will retrieve data in this format:
UserID Mobile
1 44897065
1 44897066
1 44897067
but what I want is to arrange the data into:
UserID Mobile1 Mobile2 Mobile3
1 44897066 44897065 44897065
and if another mobile for the same user is encoded, it will output as Mobile4 and so on..
I know this is strange but I want to do it for some reason :D
Is this possible and can anybody help me how to do it. Thank you so much everyone.

Answer 1

try this Sql query..
DECLARE #cols AS NVARCHAR(MAX),#query AS NVARCHAR(MAX);
SET #cols = STUFF((SELECT distinct ',' + QUOTENAME(a.MobileCategory)
from
(
Select a.UserID as UserID, b.Mobile as Mobile,'Mobile'+ CAST(ROW_NUMBER() OVER( ORDER BY b.Mobile) AS VARCHAR) AS MobileCategory
FROM _Users a INNER JOIN
_Mobiles b ON a.UserID = b.UserID
WHERE a.UserID = 1
) a
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = 'SELECT UserID,' + #cols + ' from
(
Select a.UserID as UserID,b.Mobile as Mobile,''Mobile''+ CAST(ROW_NUMBER() OVER( ORDER BY b.Mobile) AS VARCHAR) AS MobileCategory
FROM _Users a INNER JOIN
_Mobiles b ON a.UserID = b.UserID
WHERE a.UserID = 1
) x
pivot
(
sum(Mobile)
for MobileCategory in (' + #cols + ')
) p '
execute(#query)

Answer 2

This could use help, but something like this
with (
select u.userid, m1.mobid, m2.mobid, .. mN.mobid
from users u
left join mobiles m1
on u.userid=m1.userid
left join mobiles m2
on u.userid=m2.userid
...
left join mobiles mN
on u.userid=mN.userid
) as mobuser
select * from mobuser
where ( m2.mobid>m1.mobid or m2.mobid is null)
and ( m3.mobid>m2.mobid or m3.mobid is null)
...
and (mN.mobid>mNMinus1.mobid or mN.mobid is null)