SQL sever 中如何按顺序汇总各个月的值

如图，4-9月份的工时汇总和出勤汇总都是一样的数据，怎么写才能按月份顺序汇总，比如先汇总四月份的然后再汇总5月份的

SELECT a.fileld0005 AS '整机编码',b.fileid0011 AS '年月',sum(a.fileid006) AS '公式汇总',sum(a.fileid0007) AS '出勤汇总'
FROM formmain_18463 AS a LEFT JOIN formson_18473 AS b ON b.formmain_id=a.id
GROUP BY a.fileld0005 ,b.fileid0011