sum() over( partition by order by )

 测试用的数据

  1. sum(LABST) over()

 2. sum(LABST) over(order by MATNR)

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

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

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