分组统计 over(partition by

sum( CASE WHEN ISNULL(b.zl, 0) = 0 THEN C.LLZL ELSE b.zl END * c.pccd * b.sl) over(partition by b.djno,b.djlb,b.itemno,b.sku_sj) baseUnitQty,
sum(b.sl) over(partition by b.djno,b.djlb,b.itemno,b.sku_sj) auxiliaryUnitQty,

来源：https://www.cnblogs.com/gzhbk/p/11676731.html