How to select row with max value when duplicate rows exist in SQL Server
sql, sql-server
Solution
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.
Problem
I have table like this ``` DocumentID | MasterStepID | StepNumber | RoleID | UserID | Status JIEP/TT/07/000174 | Approval1 | 1 | NULL | 0006100022 | 1 JIEP/TT/07/000174 | Approval1 | 2 | 12 | 0006199013 | 3 JIEP/TT/07/000174 | Approval1 | 3 | 13 | 0006106426 | 3 JIEP/TT/07/000174 | Approval1 | 5 | 18 | 0006100022 | 3 JIEP/TT/07/000174 | Approval1 | 6 | 16 | 0006104115 | 6 ``` I expect result like this ``` JIEP/TT/07/000174 | Approval1 | 1 | NULL | 0006100022 | 1 JIEP/TT/07/000174 | Approval1 | 5 | 18 | 0006100022 | 3 JIEP/TT/07/000174 | Approval1 | 6 | 16 | 0006104115 | 6 ``` I try this query but it's return not like what I expect ``` select * from WF_Approval sr1 where not exists ( select * from WF_Approval sr2 where sr1.DocumentID = sr2.DocumentID and ( sr1.StepNumber < sr2.StepNumber ) )and MasterStepID = 'Approval1' ```