Make 1 row out of many rows from another table - sql

Question

I have a MSSQL database which in one table holds bio info about a person:
ID: Name : Age : Sex
In another table it holds their answers to a number of questions like this:
PersonID : QuestionID : Answer
Is it possible to display all of them via MSSQLMSE into one record like this:
ID : Name : Age : Sex : Question1Answer : Question2Answer : Question3Answer : And so on?

Answer 1

Try this:
SELECT ID, name, age, sex, Question1answer, Question2answer
FROM
(
SELECT
p.Id,
p.Name,
p.Age,
p.sex,
questionanswer = 'Question' + CAST(q.questionid AS VARCHAR(10)) + 'answer',
q.Answer
FROM Persons p
INNER JOIN Questions q ON p.Id = q.UserID
) t
PIVOT
(
MAX(Answer)
FOR questionanswer IN([Question1answer], [Question2answer])
) p;
SQL Fiddle Demo
This will give you:
| ID | NAME | AGE | SEX | QUESTION1ANSWER | QUESTION2ANSWER |
-----------------------------------------------------------------
| 1 | Ahmed | 25 | M | Yes | No |
| 2 | Mohammed | 30 | M | No | Never |
| 3 | Sara | 25 | F | No | Never |
However: If you want to do this dynamically for any number of questions per user, you can do this:
DECLARE #cols AS NVARCHAR(MAX);
DECLARE #query AS NVARCHAR(MAX);
select #cols = STUFF((SELECT distinct
',' +
QUOTENAME('Question' +
CAST(questionid AS VARCHAR(10)) +
'answer')
FROM questions
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'');
SET #query = 'SELECT ID, name, age, sex, ' + #cols +
' FROM
(
SELECT
p.Id,
p.Name,
p.Age,
p.sex,
questionanswer = ''Question'' +
CAST(q.questionid AS VARCHAR(10)) +
''answer'',
q.Answer
FROM Persons p
INNER JOIN Questions q ON p.Id = q.UserID
) t
PIVOT
(
MAX(Answer)
FOR questionanswer IN( ' + #cols + ') ) p ';
SQL Fiddle Dynamic Demo

Answer 2

select ID,Name,Age,Sex,
(select top 1 Answer from Questions
where PersonId=prerson.id AND QuestionID=1) as Question1Answer,
(select top 1 Answer from Questions
where PersonId=prerson.id AND QuestionID=2) as Question2Answer,
(select top 1 Answer from Questions
where PersonId=prerson.id AND QuestionID=3) as Question3Answer
from prerson

Answer 3

The PIVOT command in sql server would be appropriate to transpose table results, see http://msdn.microsoft.com/en-us/library/ms177410(v=sql.100).aspx
The script below works with a predefined set of questions. For a variable amount of columns this link would help http://blog-mstechnology.blogspot.com/2010/06/t-sql-pivot-operator-with-dynamic.html.
DECLARE #Person TABLE(
ID INT,
Name VARCHAR(50),
Age INT,
Sex CHAR(1)
)
DECLARE #Questions TABLE(
ID INT,
QuestionID INT,
Question VARCHAR(200),
Answer VARCHAR(200)
)
INSERT INTO #Person VALUES
(1,'Andrew',56,'M'),
(2,'Marge',65,'F')
INSERT INTO #Questions VALUES
(1,1,'Question1','Andrews Answer 1'),
(1,2,'Question2','Andrews Answer 2'),
(2,1,'Question1','Marge Answer 1'),
(2,3,'Question3','Marge Answer 3')
SELECT ID,Age,Name,Sex,
[1] AS 'Question1Answer',
[2] AS 'Question2Answer',
[3] AS 'Question3Answer'
FROM(
SELECT P.ID,P.Age,P.Name,P.Sex,Q.QuestionID,Q.Answer
FROM #Person P
INNER JOIN #Questions Q ON Q.ID = P.ID
) Source
PIVOT
(
MAX(Answer)
FOR QuestionID IN ([1],[2],[3])
)AS PT

Answer 4

Try this:
SELECT
ID,
Name,
Age,
Sex,
[1] AS Question1Answer,
[2] AS Question1Answer,
[3] AS Question1Answer
FROM
(SELECT
i.ID,
i.Name,
i.Age,
i.Sex,
q.QuestionId,
q.Answer
FROM
dbo.Info AS i
INNER JOIN dbo.Questions AS q on q.ID = i.ID) AS m
PIVOT
(
MAX(Answer) FOR QuestionId in ([1],[2],[3])
) as PivotTable

Answer 5

I think this (SQL Fiddle here) is what you are looking for. For a given person id;
Note: p = Person Table, a = Answer Table and qId = QuestionId
DECLARE #S VARCHAR(Max)
DECLARE #PersonId INT = 1
SELECT #S=ISNULL(#S+' : ','') + convert(varchar(10), id) +' : '+ name
+' : '+ convert(varchar(10), age)+' : '+sex
FROM p
WHERE p.Id = #PersonId
SELECT #S=ISNULL(#S+' : ','') +
'Question' + convert(varchar(10), qid) +'Answer : '+ answer
FROM a
WHERE pId = #PersonId
SELECT #S
--Following results is in one line
--1 : X : 25 : M : Question11Answer : Here is my answer for 11 :
--Question12Answer : Here is my answer for 12 :
--Question101Answer : Here is my answer for 101

Answer 6

Try this method: (Set compatability level of database to 90 or higher)
begin
Declare #MainSQL nVarchar(Max)
Declare #Param nVarchar(Max)
Declare #QId int
set #Param = ''
Declare curParam Cursor For select Distinct QuestionID from Questions
open curParam
Fetch next from curParam into #QId
While ##Fetch_Status = 0
Begin
set #Param = #Param +'[' +convert(nVarchar,#QId ) + '],'
Fetch next from curParam into #QId
End
close curParam;
Deallocate curParam;
set #Param = left(#Param,len(#Param)-1)
Set #MainSQL = 'Select ID,Name,Age,***
From
(select P.ID,Name,Age,
Q.QuestionID, Q.Answer From Person P Left outer join
Questions Q
ON P.ID = Q.PersonID) S
Pivot
(Max(Answer)
For QuestionID in(***)
) as Pvt'
Set #MainSQL =replace(#MainSQL,'***',#Param);
--print #MainSQL
execute sp_executesql #MainSQL
End