SQL Conditional Case - sql

Question

I have a table that lists items and a status about these items. The problem is that some items have multiple different status entries. For example.
HOST Status
1.1.1.1 PASS
1.1.1.1 FAIL
1.2.2.2 FAIL
1.2.3.3 PASS
1.4.2.1 FAIL
1.4.2.1 FAIL
1.1.4.4 NULL
I need to return one status per asset.
HOST Status
1.1.1.1 PASS
1.2.2.2 FAIL
1.2.3.3 PASS
1.4.2.1 FAIL
1.1.4.4 No Results
I have been trying to do this with T-SQL Case statements but can't quite get it right.
The conditions are any Pass + anything is a Pass, Fail+ No Results is a fail and Null is No Results.

Answer 1

Try using a case statement to convert to ordered results and group on that, finally, you'll need to convert back to the nice, human-readable answer:
with cte1 as (
SELECT HOST,
[statNum] = case
when Status like 'PASS' then 2
when Status like 'FAIL' then 1
else 0
end
FROM table
)
SELECT HOST, case max(statNum) when 2 then 'PASS' when 1 then 'FAIL' else 'No Results' end
FROM cte1
GROUP BY HOST
NOTE: I used a CTE statement to hopefully make things a little clearer, but everything could be done in a single SELECT, like so:
SELECT HOST,
[Status] = case max(case when Status like 'PASS' then 2 when Status like 'FAIL' then 1 else 0 end)
when 2 then 'PASS'
when 1 then 'FAIL'
else 'No Result'
end
FROM table

Answer 2

You can use Max(Status) with Group by Host to get Distinct values:
Select host, coalesce(Max(status),'No results') status
From Table1
Group by host
Order by host
Fiddle Demo Results:
| HOST | STATUS |
|---------|------------|
| 1.1.1.1 | PASS |
| 1.1.4.4 | No results |
| 1.2.2.2 | FAIL |
| 1.2.3.3 | PASS |
| 1.4.2.1 | FAIL |
By default SQL Server is case insensitive, If case sensitivity is a concern for your server, then use the lower() function as below:
Select host, coalesce(Max(Lower(status)),'No results') status
From Table1
Group by host
Order by host
Fiddle demo

Answer 3

WITH CTE( HOST, STATUSValue)
AS(
SELECT HOST,
CASE STATUS WHEN 'PASS' 1 ELSE 0 END AS StatusValue
FROM Data
)
SELECT DISTINCT HOST,
CASE ISNULL(GOOD.STATUSVALUE,-1) WHEN 1 THEN 'Pass'
ELSE CASE ISNULL( BAD.STATUSVALUE,-1) WHEN 0 Then 'Fail' Else 'No Results' END
END AS Results
FROM DATA AS D
LEFT JOIN CTE AS GOOD
ON GOOD.HOST = D.HOST
AND GOOD.STATUSVALUE = 1
LEFT JOIN CTE AS BAD
ON BAD.HOST = BAD.HOST
AND BAD.STATUSVALUE = 0