Prova detta:
SELECT l.idfeedback_store, IF(@last=(@last:=idfeedback_store), @curRow := @curRow + 1, @curRow:=1) AS row_number
FROM feedback_store l, (SELECT @curRow := 0, @last:=0) r;
Prova detta:
SELECT l.idfeedback_store, IF(@last=(@last:=idfeedback_store), @curRow := @curRow + 1, @curRow:=1) AS row_number
FROM feedback_store l, (SELECT @curRow := 0, @last:=0) r;