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 6
Incorrect 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).