Remove Comma from Case Statement - sql-server

Question

I realise this is a common question, but I'm wanting to avoid having to repeat the CASE statements multiple times.
Can anyone see a way of how the "," can be excluded from the string if only a few Cases are true(1)?
SELECT CONCAT
(
CASE WHEN Home = 1 THEN 'Own Home, ' END,
CASE WHEN Car = 1 THEN 'Car, ' END,
CASE WHEN Friend = 1 THEN 'Someone else''s home, ' END,
CASE WHEN Toilet = 1 THEN 'Toilet, ' END,
CASE WHEN Street = 1 THEN 'Street, park or beach, ' END,
CASE WHEN Squat = 1 THEN 'Squat, ' END,
CASE WHEN Other = 1 THEN 'Other' END
)
as 'Question 6',
from table

Answer 1

Try this
SELECT REVERSE(stuff(reverse(CONCAT
(
CASE WHEN Home = 1 THEN 'Own Home, ' END,
CASE WHEN Car = 1 THEN 'Car, ' END,
CASE WHEN Friend = 1 THEN 'Someone else''s home, ' END,
CASE WHEN Toilet = 1 THEN 'Toilet, ' END,
CASE WHEN Street = 1 THEN 'Street, park or beach, ' END,
CASE WHEN Squat = 1 THEN 'Squat, ' END,
CASE WHEN Other = 1 THEN 'Other' END
)),1 ,1,''))
as 'Question 6',
from TABLE
OR this
SELECT STUFF(CONCAT
(
CASE WHEN Home = 1 THEN ', Own Home' END,
CASE WHEN Car = 1 THEN ', Car' END,
CASE WHEN Friend = 1 THEN ', Someone else''s home' END,
CASE WHEN Toilet = 1 THEN ', Toilet' END,
CASE WHEN Street = 1 THEN ', Street, park or beach' END,
CASE WHEN Squat = 1 THEN ', Squat' END,
CASE WHEN Other = 1 THEN ', Other' END
),1,2,'')
as 'Question 6',
from table

Answer 2

It may not be the fastest, but just for fun.
WITH T3 AS
(
SELECT T1.PK, COALESCE(T2.Description, unpvt.Place) AS Description
FROM table AS T1
UNPIVOT
(Flag FOR Place IN (Home, Car, Friend, Toilet, Street, Squat, Other)
) AS unpvt
LEFT OUTER JOIN
(
SELECT *
FROM (VALUES('Home', 'Own Home'), ('Friend', 'Someone else''s home'), ('Street', 'Street, park or beach')) AS T(Place, Description)
) AS T2 ON unpvt.Place = T2.Place
WHERE Flag = 1
)
SELECT PK, (STUFF((
SELECT ', ' + Description
FROM T3 AS T4
WHERE T4.PK = T3.PK
FOR XML PATH('')), 1, 2, '')) AS Question6
FROM T3
GROUP BY PK
To preserve order in question, just add an order column to T2 above.
With SQL Server 2017, it's simpler.
SELECT T1.PK, STRING_AGG(COALESCE(T2.Description, unpvt.Place), ', ') AS Description
FROM table AS T1
UNPIVOT
(Flag FOR Place IN (Home, Car, Friend, Toilet, Street, Squat, Other)
) AS unpvt
LEFT OUTER JOIN
(
SELECT *
FROM (VALUES('Home', 'Own Home'), ('Friend', 'Someone else''s home'), ('Street', 'Street, park or beach')) AS T(Place, Description)
) AS T2 ON unpvt.Place = T2.Place
WHERE Flag = 1
GROUP BY PK