Divide N rows to N columns - sql

Question

I have a result set which provide me 2 columns named Sequence and CorrectAns and it contains N rows(100 rows right now to be specific).
Now what I want is to divide these 100 rows to N columns(right now into 4 columns).
So, how to do that? Any help would be appreciated.
This is the result that i am getting. Now what I want is something like this:
Seq ColA Seq ColB Seq ColC Seq ColD
1 C 4 A 7 C 10 D
2 A 5 C 8 A 11 C
3 A 6 A 9 C 12 A
and so on.
Hope this helps

Answer 1

What you want is to pivot your data. Aside from the PIVOT command, one way to do that is to use conditional aggregation:
SQL Fiddle
;WITH Cte AS(
SELECT *,
grp = (ROW_NUMBER() OVER(ORDER BY Seq) -1) %
(SELECT CEILING(COUNT(*) / (4 * 1.0)) FROM tbl)
FROM tbl
),
CteFinal AS(
SELECT *,
rn = ROW_NUMBER() OVER(PARTITION BY grp ORDER BY Seq)
FROM Cte
)
SELECT
SeqA = MAX(CASE WHEN rn = 1 THEN Seq END),
ColA = MAX(CASE WHEN rn = 1 THEN CorrectAns END),
SeqB = MAX(CASE WHEN rn = 2 THEN Seq END),
ColB = MAX(CASE WHEN rn = 2 THEN CorrectAns END),
SeqC = MAX(CASE WHEN rn = 3 THEN Seq END),
ColC = MAX(CASE WHEN rn = 3 THEN CorrectAns END),
SeqD = MAX(CASE WHEN rn = 4 THEN Seq END),
ColD = MAX(CASE WHEN rn = 4 THEN CorrectAns END)
FROM CteFinal
GROUP BY grp

Answer 2

use the following query,
SELECT *
FROM (
SELECT
Seq, CorrectAns,
gro
FROM your_table
) as t
PIVOT
(
SUM(gro)
FOR CorrectAns IN (A,B,C,D....)
)AS pvt

Answer 3

If i understood what you said clearly, you can put your result set in an Array.
and then use this SQL QUERY
ALTER TABLE table_name
ADD column_name datatype
Example :
ALTER TABLE customer ADD name VARCHAR(Max);
You can specified a loop from the 0 to size of the Array and put that query inside the loop.
Edit :
Ok, I think it should be something like this;
DECLARE #cnt INT = 0;
DECLARE #str = "";
WHILE #cnt < 100000
BEGIN
SET #cnt = #cnt + 1;
SET #str='yourRowName';
ALTER TABLE yourTableName
ADD str datatype
END;
Take a look at this.
http://www.techonthenet.com/sql_server/loops/for_loop.php