Each Column in Separate Row - sql

Question

How can I display each column in separate row and at the end add additional field.
For example I have this result:
ID ArticleName Brend1 Brend2 Brend3
== =========== ======== ======== ========
1 TestArticle 10001 20002 30003
I want to achieve this:
ID ArticleName BrandNo BrandName
== =========== ======= =========
1 TestArticle 10001 if column name = Brand1 Then Nike
1 TestArticle 20002 if column name = Brand2 Then Adidas
1 TestArticle 30003 if column name = Brand3 Then Mercedes
I can show each column in separate row, but how can I add additional column to the end of the result BrandName
Here is what I've done:
DECLARE #temTable TABLE
(
Id INT,
ArticleName VARCHAR(20),
Brand1 VARCHAR(20),
Brand2 VARCHAR(20),
Brand3 VARCHAR(20)
);
INSERT INTO #temTable
(
Id,
ArticleName,
Brand1,
Brand2,
Brand3
)
VALUES
(1, 'TestArticle', '10001', '20002', '30003');
SELECT Id,
ArticleName,
b.*
FROM #temTable a
CROSS APPLY
(
VALUES
(Brand1),
(Brand2),
(Brand3)
) b (Brand)
WHERE b.Brand IS NOT NULL;

Answer 1

You could use CROSS APPLY as
SELECT Id, ArticleName, Br BrandNo, Val BrandName
FROM #TemTable TT
CROSS APPLY(
VALUES
(Brand1, 'Nike'),
(Brand2, 'Adidas'),
(Brand3, 'Mercedes')
) T(Br, Val)
db-fiddle

Answer 2

I assume the brand is stored in another table, so you just need to add another column in your VALUES operator, and then join to the Brand Table:
SELECT Id,
ArticleName,
V.Brand
FROM #temTable a
CROSS APPLY (VALUES (1,Brand1),
(2,Brand2),
(3,Brand3)) V (BrandID,Brand)
JOIN dbo.Brand B ON V.BrandID = B.BrandID
WHERE V.Brand IS NOT NULL;

Answer 3

You can use UNPIVOT to achieve this. You can use either a case statement or another table variable to switch column names with brand names, I would prefer a table variable with a join it would make adding new column a bit easier.
DECLARE #d TABLE (ColNames VARCHAR(128) , BrandName VARCHAR(100))
INSERT INTO #d VALUES ('Brand1', 'Nike'),('Brand2', 'Adidas'),('Brand3', 'Mercedes')
SELECT up.Id
, up.ArticleName
, up.BrandNo
, d.BrandName
FROM #temTable
UNPIVOT (BrandNo FOR ColNames IN (Brand1,Brand2,Brand3)) up
INNER JOIN #d d ON d.ColNames = up.ColNames