sql:=fmt.Sprintf("SELECT time, uid,sum(fee) AS amount FROM bills WHERE time >= '%s' and time <= '%s' SAMPLE BY 1d ALIGN TO CALENDAR GROUP BY uid,time;",start,end)
sql:=fmt.Sprintf("SELECT time, uid,sum(fee) AS amount FROM bills WHERE time >= '%s' and time <= '%s' SAMPLE BY 1d ALIGN TO CALENDAR GROUP BY uid,time;",start,end)