Sql query for Transpose of a dynamic Table - sql

Question

The sql table is as follows,
Name Salary NoticePeriod CTC
Jack 1520 15 123
Bruce 1423 35 165
and it contains about 1000 rows.
I need to do a transpose of this table ,such that the expected output is
Fields Jack Bruce Mike ..... Sam
Salary 1520 1423 235 .. 561
NoticePeriod 15 35 23 253
CTC 123 165 45 ... 125
I tried using Pivot and Unpivot function in Sql Server 2008 . But Since the Name record is large , Pivot query doesnt helps.
My sql attempt is follows,
SELECT *
FROM (
SELECT NAME,
Salary,
NoticePeriod,
CTC
FROM CTCTABLE WITH (NOLOCK)
) AS queryTable
UNPIVOT(Value FOR NAME IN (NAME, Salary, NoticePeriod, CTC)) AS unpv
PIvot(max(Value) FOR NAME IN (Salary, NoticePeriod, CTC)) pv

Answer 1

In your case, you should unpivot the columns Salary, NoticePeriod, CTC into rows, then PIVOT:
WITH Unpivoted
AS
(
SELECT Name, Fields, SalaryValue
FROM salaries AS s
UNPIVOT
(
SalaryValue
FOR Fields IN(Salary, NoticePeriod, CTC)
) AS u
)
SELECT Fields, jack,bruce
FROM Unpivoted AS u
PIVOT
(
MAX(SalaryValue)
FOR Name IN(Jack, Bruce)
) AS p;
The UNPIVOT will transform the columns Salary, NoticePeriod, CTC into values:
Then the pivot will pivot the salary values for each field value and transform the names into columns.
And of course you have to do it dynamically instead of writing list of names like this:
DECLARE #cols AS NVARCHAR(MAX);
DECLARE #colnames AS NVARCHAR(MAX);
DECLARE #query AS NVARCHAR(MAX);
SELECT #cols = STUFF((SELECT distinct ',' +
QUOTENAME(name)
FROM salaries
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
, 1, 1, '');
SELECT #query = 'WITH Unpivoted
AS
(
SELECT Name, Fields, SalaryValue
FROM salaries AS s
UNPIVOT
(
SalaryValue
FOR Fields IN(Salary, NoticePeriod, CTC)
) AS u
)
SELECT Fields, ' + #cols + '
FROM Unpivoted AS u
PIVOT
(
MAX(SalaryValue)
FOR Name IN(' + #cols + ')' +
') p';
execute(#query);
This will give you:
Live Demo (Thanks to #lad2025 for it)