Incorrect syntax near the keyword 'rowcount' - sql

Question

I have this code:
merge dbo.tblProblems as target
using (
select max(problemID), StationName, problemCode, max(ProblemCreateDate), count(*)
from dbo.tblProblems
group by StationName, problemCode
) as source(id, StationName, problemCode, maxdate, rowcount)
on (
target.problemID = source.problemID
and target.StationName = target.StationName
and target.problemCode = target.problemCode
)
when matched then
update set ProblemCreateDate = maxdate, probCount = rowcount
when not matched then delete ;
But it yields this error:
Msg 156, Level 15, State 1, Line 6Incorrect syntax near the keyword 'rowcount'.
And this version of the query:
;WITH n AS
(
SELECT problemID, StationName, problemCode, ProblemCreateDate, probCount
c = COUNT(*) OVER (PARTITION BY StationName, problemCode),
rn = ROW_NUMBER() OVER
(
PARTITION BY StationName, problemCode ORDER BY ProblemCreateDate DESC, problemID DESC
)
FROM dbo.tblProblems
)
--SELECT problemID, StationName, problemCode, ProblemCreateDate, c
-- FROM n WHERE rn = 1;
UPDATE n SET probCount = c
WHERE rn = 1;
Yields this error:
Msg 102, Level 15, State 1, Line 4
Incorrect syntax near '='.

Answer 1

For the first query, rowcount is a reserved keyword. Use a different word (e.g. row_count) or surround it in square brackets:
[rowcount]
For the second query, you need a comma after probCount:
SELECT problemID, StationName, problemCode, ProblemCreateDate, probCount,
------------------------------------------------------------------------^
c = COUNT(*) OVER (PARTITION BY StationName, problemCode),
You didn't quite adapt my code sample correctly (the trailing comma is there).