SQL 计算累计和 sum() over( partition by order by )

1).数据

 2). sum(LABST) over()

 3). sum(LABST) over(order by MATNR)

4).sum(LABST) over(order by MATNR,ZWEEK)

 5).sum(LABST) over(partition by MATNR order by MATNR)

 6).sum(LABST) over(partition by MATNR order by MATNR,ZWEEK)