Transact-SQL Select Query Giving duplicate values - sql

Question

first off, thank you for taking the time to look at this.
I am trying to collect data from 3 tables and make a reference chart that allows the end user to see the stored data.
Basically I have 3 tables for this example:
USERS:
USER_PK USER_ID USER_NAME
1 10000 Bob
2 10001 Sally
3 10003 Joe
4 10004 Susan
SKILL_TYPE:
SKILL_PK SKILL_NAME
11 Point of Sale
22 Digital Sales
33 Customer Service
44 Specialist Support
SKILL_ASSOCIATION:
SKILL_ASSOC_PK SKILL_PK USER_PK START_DATE STOP_DATE Priority
99 11 1 36526 500000 2
88 11 2 36527 500000 3
77 22 1 36526 500000 3
66 33 3 36528 500000 1
55 44 4 36525 500000 1
444 33 4 36525 500000 4
(I know I've probably broken some rules with cataloging this data I did it in SQL Express, however it is only an example and not representative of the real data I am using)
My Select Query Returns an unwanted result with multiple lines for each USER:
Statement:
SELECT USERS.[USER_NAME], USERS.[USER_ID],
(CASE WHEN ST.SKILL_NAME ='Point of Sale' Then SA.[PRIORITY] END) AS 'POS',
(CASE WHEN ST.SKILL_NAME ='Digital Sales' Then SA.[PRIORITY] END) AS 'DS',
(CASE WHEN ST.SKILL_NAME ='Customer Service' Then SA.[PRIORITY] END) AS 'CS',
(CASE WHEN ST.SKILL_NAME ='Specialist Support' Then SA.[PRIORITY] END) AS 'Spec'
FROM USERS
INNER JOIN [dbo].[SKILL_ASSOCIATION] AS SA ON SA.USER_PK = USERS.USER_PK
INNER JOIN SKILL_TYPE AS ST ON ST.SKILL_PK = SA.SKILL_PK
Result:
USER_NAME USER_ID POS DS CS Spec
Bob 10000 2 NULL NULL NULL
Sally 10001 3 NULL NULL NULL
Bob 10000 NULL 3 NULL NULL
Joe 10003 NULL NULL 1 NULL
Susan 10004 NULL NULL NULL 1
Susan 10004 NULL NULL 4 NULL
I've tried using distinct as well with similar results.
Desired Results:
NAME ID POS DS CS Spec
Bob 1 2 3
Sally 2 3
Joe 1
Susan 4 1
I have very limited Query access with this SQL Server and cannot create/modify or delete from it to accomplish my objective.
Any guidance would be much appreciated!
Thanks,
Steven

Answer 1

Your expected output implies that an aggregation by user along with taking the MAX of each of the CASE expressions should work:
SELECT
u.[USER_NAME],
u.[USER_ID],
MAX(CASE WHEN ST.SKILL_NAME = 'Point of Sale' THEN SA.[PRIORITY] END) AS POS,
MAX(CASE WHEN ST.SKILL_NAME = 'Digital Sales' THEN SA.[PRIORITY] END) AS DS,
MAX(CASE WHEN ST.SKILL_NAME = 'Customer Service' THEN SA.[PRIORITY] END) AS CS,
MAX(CASE WHEN ST.SKILL_NAME = 'Specialist Support' THEN SA.[PRIORITY] END) AS Spec
FROM USERS u
INNER JOIN [dbo].[SKILL_ASSOCIATION] AS SA
ON SA.USER_PK = u.USER_PK
INNER JOIN SKILL_TYPE AS ST
ON ST.SKILL_PK = SA.SKILL_PK
GROUP BY
u.[USER_NAME],
u.[USER_ID];