Pilih Baris Pertama Setiap Grup di sql

Anda dapat menggunakan ROW_NUMBER() fungsinya seperti ini:

SELECT *
  FROM(SELECT workflowid, salesRepId, quantityAssigned,
              quantityLeft, month, year
              , ROW_NUMBER()
                OVER (PARTITION BY salesRepId
                          ORDER BY workflowid) AS rownumber
         FROM sm_salesRepWorkflow)
 WHERE rownumber = 1;

Demo Biola