How to select row with max value when duplicate rows exist in SQL Server

Question

I have table like this

DocumentID        | MasterStepID | StepNumber | RoleID | UserID     | Status
JIEP/TT/07/000174 | Approval1    |          1 |   NULL |         


        

Answer 1

You're basically just missing a status comparison since you want one row per status;

SELECT *
FROM WF_Approval sr1
WHERE NOT EXISTS (
    SELECT *
    FROM  WF_Approval sr2 
    WHERE sr1.DocumentID = sr2.DocumentID AND 
          sr1.Status = sr2.Status AND                  # <-- new line
          sr1.StepNumber < sr2.StepNumber
) AND MasterStepID = 'Approval1'

or rewritten as a JOIN;

SELECT *
FROM WF_Approval sr1
LEFT JOIN WF_Approval sr2
  ON sr1.DocumentID = sr2.DocumentID 
 AND sr1.Status = sr2.Status
 AND sr1.StepNumber < sr2.StepNumber
WHERE sr2.DocumentID IS NULL
  AND sr1.MasterStepID = 'Approval1';

SQLfiddle with both versions of the query here.