SQL Server- PIVOT table. transform row into columns - sql

Question

I am trying to convert rows into columns. here is my query
SELECT M.urn,
M.eventdate,
M.eventlocation,
M.eventroom,
M.eventbed,
N.time
FROM admpatevents M
INNER JOIN admpattransferindex N
ON M.urn = N.urn
AND M.eventseqno = N.eventseqno
AND M.eventdate = N.eventdate
WHERE M.urn = 'F1002754364'
AND M.eventcode = 'TFRADMIN'
Current result
URN Date Location Room Bed Time
F1002754364 20121101 EDEXPRESS 4-152 02 0724
F1002754364 20121101 CARDSURG 3-110 02 1455
F1002754364 20121102 CHEST UNIT 6-129-GL04 1757
required result
F1002754364 20121101 EDEXPRESS 4-152 02 0724 20121101 CARDSURG 3-110 02 1455 20121102 CHEST UNIT 6-129-GL 04 1757
Thanks for your help.

Answer 1

Since you are using SQL Server you can use both the UNPIVOT and PIVOT functions to transform this data. If you know how many values to you will have then you can hard-code the values similar to this:
select *
from
(
select urn,
value,
col +'_'+ CAST(rn as varchar(10)) as col
from
(
SELECT M.urn,
cast(M.eventdate as varchar(50)) eventdate,
M.eventlocation,
M.eventroom,
M.eventbed,
cast(N.time as varchar(50)) time,
ROW_NUMBER() over(PARTITION by m.urn order by m.eventdate) rn
FROM admpatevents M
INNER JOIN admpattransferindex N
ON M.urn = N.urn
AND M.eventseqno = N.eventseqno
AND M.eventdate = N.eventdate
WHERE M.urn = 'F1002754364'
AND M.eventcode = 'TFRADMIN'
) src1
unpivot
(
value
for col in (eventdate, eventlocation, eventroom, eventbed, time)
) unpiv
) src2
pivot
(
max(value)
for col in ([eventdate_1], [eventlocation_1], [eventroom_1], [eventbed_1], [time_1],
[eventdate_2], [eventlocation_2], [eventroom_2], [eventbed_2], [time_2],
[eventdate_3], [eventlocation_3], [eventroom_3], [eventbed_3], [time_3])
) piv
Note- not tested
If you have an unknown number of columns, then you can use dynamic sql similar to this:
DECLARE #query AS NVARCHAR(MAX),
#colsPivot as NVARCHAR(MAX)
select #colsPivot = STUFF((SELECT ','
+ quotename(c.name +'_'+ cast(t.rn as varchar(10)))
from
(
select ROW_NUMBER() over(PARTITION by m.urn order by m.eventdate) rn
FROM admpatevents M
INNER JOIN admpattransferindex N
ON M.urn = N.urn
AND M.eventseqno = N.eventseqno
AND M.eventdate = N.eventdate
WHERE M.urn = 'F1002754364'
) t
cross apply sys.columns as C
where C.object_id IN (object_id('admpatevents'), object_id('admpattransferindex')) and
C.name not in ('urn') -- add any other columns your want to exclude
group by c.name, t.rn
order by t.rn
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query
= 'select *
from
(
select urn, value, col +''_''+ CAST(rn as varchar(10)) as col
from
(
SELECT M.urn,
cast(M.eventdate as varchar(20)) eventdate,
M.eventlocation,
M.eventroom,
M.eventbed,
cast(N.time as varchar(20)) time,
ROW_NUMBER() over(PARTITION by m.urn order by m.eventdate) rn
FROM admpatevents M
INNER JOIN admpattransferindex N
ON M.urn = N.urn
AND M.eventseqno = N.EVENTseqno
AND M.eventdate = N.eventdate
WHERE M.urn = ''F1002754364''
) x
unpivot
(
value
for col in (eventdate, eventlocation, eventroom, eventbed, time)
) u
) x1
pivot
(
max(value)
for col in ('+ #colspivot +')
) p'
exec(#query)
See SQL Fiddle with Demo