STUFF in SQL Server with 2 tables on primary ID - sql-server

Question

I have 2 tables Contracts and Locations.
Contracts columns: CTX_ID, Parent_CTX_ID, Company_name
Locations columns: CTX_ID, State
I'm trying to create an out put that concatenates the STATE in one column for each Parent_CTX_ID.
Contracts table:
CTX_ID | Parent_CTX_ID | Company_Name
-------+---------------+-------------
1 | 100 | ABC
2 | 100 | ABC
3 | 100 | ABC
4 | 200 | DEF
5 | 200 | DEF
6 | 200 | DEF
Locations table:
CTX_ID | State
-------+------
1 | NJ
2 | PA
3 | DE
4 | NJ
5 | TX
6 | CA
Output I'm trying to get:
CTX_ID | Parent_CTX_ID | Company_Name | State | States
-------+---------------+--------------+-------+-----------
1 | 100 | ABC | NJ | NJ,PA,DE
2 | 100 | ABC | PA | NJ,PA,DE
3 | 100 | ABC | DE | NJ,PA,DE
4 | 200 | DEF | NJ | NJ,TX,CA
5 | 200 | DEF | TX | NJ,TX,CA
6 | 200 | DEF | CA | NJ,TX,CA
Current code:
(SELECT DISTINCT
c.parent_ctx_id,
STUFF((SELECT DISTINCT ',' + s.state
FROM Locations s
FOR XML PATH('')), 1, 1, '') as STATES
FROM
Contracts AS c
INNER JOIN
Locations AS s ON s.ctx_id = c.ctx_id)
Current output:
Parent_CTX_ID | States
--------------+---------------
100 | CA,DE,NJ,PA,TX
200 | CA,DE,NJ,PA,TX

Answer 1

SELECT
P.CTX_ID,
P.Parent_CTX_ID,
P.Company_Name,
L.State,
(
STUFF((SELECT
',' + s.state as [text()]
FROM
Contracts AS c
JOIN Locations AS s ON
s.ctx_id = c.ctx_id
WHERE
C.Parent_CTX_ID = P.Parent_CTX_ID
FOR XML PATH('')), 1, 1, '')
) States
FROM
Contracts P
LEFT JOIN Locations L ON
L.CTX_ID = P.CTX_ID
SQL Fiddle

Answer 2

You can create a CTE for the new locations (with parent_ctx_id) and use that in your query like below:
;WITH NEW_LOCATIONS AS
(
SELECT l.CTX_ID, l.[State], c.Parent_CTX_ID
FROM #locations l
JOIN #contracts c ON c.CTX_ID = l.CTX_ID
)
--SELECT * FROM new_locations
,cte AS
(
SELECT DISTINCT c.parent_ctx_id,
STUFF((SELECT DISTINCT ',' + s.state
FROM NEW_LOCATIONS s
WHERE s.Parent_CTX_ID = c.Parent_CTX_ID
FOR XML PATH('')), 1, 1, '') as STATES
FROM #contracts AS c
GROUP BY c.Parent_CTX_ID
)
--SELECT * FROM cte
SELECT c2.CTX_ID , c.Parent_CTX_ID , Company_Name , l.[State] , States
FROM cte c
JOIN #contracts c2 ON c.parent_ctx_id = c2.Parent_CTX_ID
JOIN #locations l ON l.CTX_ID = c2.CTX_ID
Please find the db<>fiddle here.