Reverse Table In SQL - sql

Question

I have query:
SELECT DISTINCT temp.ID,request.RequestTypeID
FROM #MyTempTable6 as temp
JOIN dbo.FingerMachineUsers as fingeruser
ON temp.UserNo = fingeruser.ID
JOIN dbo.AppUsers as appuser
ON appuser.Id = fingeruser.UserId
LEFT JOIN dbo.Requests as request
ON request.UserId = fingeruser.UserId
And result of it:
How can I create table like this:
ID|RequestTypeID1|RequestTypeID2
1 | 4| 5

Answer 1

If you have only two values, then the simplest method is aggregation:
SELECT t.ID, MIN(r.RequestTypeID), MAX(r.RequestTypeID)
FROM #MyTempTable6 t JOIN
dbo.FingerMachineUsers fu
ON t.UserNo = fu.ID JOIN
dbo.AppUsers au
ON au.Id = fu.UserId LEFT JOIN
dbo.Requests r
ON r.UserId = fu.UserId
GROUP BY t.ID;
If you have have a variable number of values that you want to present, then the query is much more complicated.

Answer 2

PIVOT operator could be your best friend, if there are always only 2 values each...

Answer 3

Try this query...
Disclaimer: This code is purely based on this answer. (https://stackoverflow.com/a/10404455/6327676)
DECLARE #cols AS NVARCHAR(max),
#query AS NVARCHAR(max);
SET #cols = Stuff((SELECT DISTINCT ',' + Quotename(stff.requesttypeid)
FROM TableName stff
FOR xml path(''), type).value('.', 'NVARCHAR(MAX)'), 1, 1, ''
)
SET #query = 'SELECT ID, '+ #cols
+ ' FROM (select ID, RequestTypeId FROM TableName) x pivot (MAX(RequestTypeId) FOR RequestTypeId in ('
+ #cols + ')) p'
EXECUTE(#query)

Answer 4

Try this code it will work according to the result you want.
Firstly you need to dump #MyTempTable6 table into #temptable
then set RequestTypeID columns as comma seperated in #colums varible then set the columnname in #Requestcolumns variable,Then use pivot.
DECLARE #colums AS NVARCHAR(max)
DECLARE #Requestcolumns AS NVARCHAR(max)
DECLARE #query AS NVARCHAR(max);
SELECT DISTINCT temp.ID,request.RequestTypeID
into #temptable
FROM #MyTempTable6 as temp
JOIN dbo.FingerMachineUsers as fingeruser
ON temp.UserNo = fingeruser.ID
JOIN dbo.AppUsers as appuser
ON appuser.Id = fingeruser.UserId
LEFT JOIN dbo.Requests as request
ON request.UserId = fingeruser.UserId
SET #colums = Stuff((SELECT DISTINCT ',' +Quotename(tab.RequestTypeID)
FROM #temptable tab
FOR xml path(''), type).value('.', 'NVARCHAR(MAX)'), 1, 1, ''
)
SET #Requestcolumns = Stuff((SELECT DISTINCT ',' +Quotename(tab.RequestTypeID) +' AS ',+Quotename('RequestTypeID'+CONVERT(varchar(100),tab.RequestTypeID))
FROM #temptable tab
FOR xml path(''), type).value('.', 'NVARCHAR(MAX)'), 1, 1, ''
)
SET #query = 'SELECT ID, '+#Requestcolumns
+ ' FROM (select ID, RequestTypeID FROM #temptable) x pivot (MAX(RequestTypeID) FOR RequestTypeID in ('
+ #colums + ')) p'
EXECUTE(#query)
DROP table #temptable