Pivoting in sql [duplicate] - sql

Question

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SQL Server: Examples of PIVOTing String data
(7 answers)
Closed 7 years ago.
i have sql table with data as given below
emp id empname dept
------- ---- ------
1 a Hr
2 b Hr
3 c Tech
4 d Hr
5 e Admin
7 f Tech
8 g Admin
Now i want to pivot the above table get the result like this
Hr Tech Admin
----- ----- -----
Empname a c e
Empname b f g
Empname d
I am just wondering is this even possible using pivoting in sql or there is any other mean to achieve this

Answer 1

You can use conditional aggregation with ROW_NUMBER:
SQL Fiddle
WITH Cte AS(
SELECT *,
RN = ROW_NUMBER() OVER(PARTITION BY dept ORDER BY empid)
FROM tbl
)
SELECT
[Hr] = MAX(CASE WHEN dept = 'Hr' THEN empname END),
[Tech] = MAX(CASE WHEN dept = 'Tech' THEN empname END),
[Admin] = MAX(CASE WHEN dept = 'Admin' THEN empname END)
FROM cte
GROUP BY rn
Here is the PIVOT version:
SQL Fiddle
;WITH Cte AS(
SELECT *,
RN = ROW_NUMBER() OVER(PARTITION BY dept ORDER BY empid)
FROM tbl
)
SELECT *
FROM(
SELECT
dept, MAX(empname) AS empname,RN
FROM Cte
GROUP BY dept, RN
)t
PIVOT
(
MAX(empname)
FOR dept in ([Hr], [Tech], [Admin])
)piv

Answer 2

This type of manipulation is often best done in the presentation layer. It appears that you want three different lists in the columns, so the rows are not really related to each other.
That said, you can do this in SQL, but you need to get a "list position" for each column. For that, use row_number():
select h.empname as hr, t.empname as tech, a.empname as admin
from (select empname, row_number() over (order by empname) as seqnum
from table
where dept = 'Hr'
) h full outer join
(select empname, row_number() over (order by empname) as seqnum
from table
where dept = 'Tech'
) t
on t.seqnum = h.seqnum full outer join
(select empname, row_number() over (order by empname) as seqnum
from table
where dept = 'Admin'
) a
on a.seqnum in (h.seqnum, t.seqnum)