how to rotate a table-valued in SQL Server - sql-server

Question

I have a table above and I want to convert it to a table as shown below
What methods can I use to do this?
I tried using PIVOT but I don't know how to change the Score column
So I hope I can find a solution to the above problem
I have done that
But I want to use a table variable instead of a table. How to do it?
I want to replace Table your_table_name with a variable #table.
But SQL says Must declare the scalar variable "#table" but I have declared it before.

Answer 1

It's hard to tell what you tried with PIVOT and why it didn't work, but:
SELECT Name, aa, bb, cc
FROM dbo.YourTableName
PIVOT
(
MAX(score) FOR subjects IN ([aa],[bb],[cc])
) AS p;
Working example in this fiddle.

Answer 2

based on your comments, you want to use table variables. For this reason, you will need to create a table type
use below example
CREATE TYPE MyTableType AS TABLE
(Name char(1), subjects char(2), score int);
GO
declare #sql as Nvarchar(max);
declare #your_table_name AS MyTableType;
INSERT INTO #your_table_name VALUES
('a', 'aa', 5),
('a', 'bb', 6),
('a', 'cc', 3),
('b', 'bb', 7),
('b', 'cc', 8);
select #sql = N'select [name],' + stuff((
select distinct
',max(case [subjects] when ' + char(39) + [subjects] + char(39)
+
' then [score] end) [' + [subjects] + ']'
from #your_table_name
for xml path('')
), 1, 1, '');
select #sql += N'from #your_table_name group by [name];';
PRINT #SQL
EXEC sp_executesql #SQL,
N'#your_table_name MyTableType READONLY',
#your_table_name=#your_table_name
I found this method here and this answer explains in a better way
https://stackoverflow.com/a/12876775/13800469

Answer 3

You can do this by executing a dynamically creates query.
Query
declare #sql as varchar(max);
select #sql = 'select [name],' + stuff((
select distinct
',max(case [subjects] when ' + char(39) + [subjects] + char(39)
+
' then [score] end) [' + [subjects] + ']'
from your_table_name
for xml path('')
), 1, 1, '');
select #sql += ' from your_table_name group by [name];';
exec(#sql);
Find demo here