SQL aggregate values and add new columns - sql

Question

I am having some trouble to aggregate data on row-inputs. I have two columns originally, but i want to split the data based on PortID and add five columns which now lie in the AssetClass column as row values.
The first table is how the data is structured now, the second is what i want it to look like.
Anyone have any tips how to do this? Thanks in advance.

Answer 1

You basically need to pivot your data set. Below query will pivot you data set purely using UNION and GROUP BY Clause which will be supported by any database system. You can add your pivot asset class S,U,P inside set_union block as done for C,F
Alternatively, you can simply use PIVOT operator.
CREATE TABLE sample
(
id int,
port_id nvarchar(10),
percent_weight int,
asset_class nvarchar(1)
);
INSERT INTO sample values
('1','SOL','15','C'),
('2','EID','20','C'),
('3','PAR','25','C'),
('45','SOL','30','F'),
('46','EID','40','F'),
('47','PAR','45','F')
;
SELECT
port_id,
MAX(C) AS C,
MAX(F) AS F
FROM
(
SELECT
id,
port_id,
percent_weight AS C,
NULL AS F
FROM
sample
WHERE
asset_class='C'
UNION
SELECT
id,
port_id,
NULL AS C,
percent_weight AS F
FROM
sample
WHERE
asset_class='F'
)set_union
GROUP BY
port_id
ORDER BY
id ASC;
Output: