Sql 更新同一表中记录的总和（将多条记录减少为一条）

我们有多个具有相同键（项）的记录，我们希望使用更新将这些记录的总和减少为一个记录。目标记录就是这些记录之一。我们也希望在多个项目上这样做。 示例（）：

我已经试过了：

update Itemstock 
    Set queuequantity       = (Select Sum(IS_2.queuequantity)       from itemstock IS_2 where (IS_2.item=item) and IS_2.bookyear=2017),
        reservationquantity = (Select Sum(IS_2.reservationquantity) from itemstock IS_2 where (IS_2.item=item) and IS_2.bookyear=2017),
        warehousequantity   = (Select Sum(IS_2.warehousequantity)   from itemstock IS_2 where (IS_2.item=item) and IS_2.bookyear=2017),
        averageout          = (Select Sum(IS_2.averageout)          from itemstock IS_2 where (IS_2.item=item) and bookyear=2017),
        purchasequantity    = (Select Sum(IS_2.purchasequantity)    from itemstock IS_2 where (IS_2.item=item) and IS_2.bookyear=2017),
        financialamount     = (Select Sum(IS_2.financialamount)     from itemstock IS_2 where (IS_2.item=item) and IS_2.bookyear=2017),
        financialresult     = (Select Sum(IS_2.financialresult)     from itemstock IS_2 where (IS_2.item=item) and IS_2.bookyear=2017),
        technicalquantity   = (Select Sum(IS_2.technicalquantity)   from itemstock IS_2 where (IS_2.item=item) and IS_2.bookyear=2017),
        technicalamount     = (Select Sum(IS_2.technicalamount)     from itemstock IS_2 where (IS_2.item=item) and IS_2.bookyear=2017),
        technicalresult     = (Select Sum(IS_2.technicalresult)     from itemstock IS_2 where (IS_2.item=item) and IS_2.bookyear=2017)
    where item=(select objectid from item where Itemgroup=15900239)
        and Stockno=0
        and bookyear=2017`

但是，这会产生以下错误：

单件选择中的多行

---

我明白原因，但无法找到解决方案。我不是SQL专家

不要使用所有相关的子查询，尝试使用聚合一次，并在连接时进行更新。此外，在where子句中使用

，因为子查询可能返回多行：

update a
set a.queuequantity = b.queuequantity,
    a.reservationquantity = b.reservationquantity,
    ...
from itemstock a
join (
    select item,
        Sum(queuequantity) as queuequantity,
        Sum(reservationquantity) as reservationquantity,
        ...
    from itemstock
    where bookyear = 2017
    group by item
    ) b on a.item = b.item
where a.item in (
        select objectid
        from item
        where Itemgroup = 15900239
        )
    and a.Stockno = 0
    and a.bookyear = 2017

不要使用所有相关的子查询，尝试使用聚合一次，并在连接时进行更新。此外，在where子句中使用
，因为子查询可能返回多行：

update a
set a.queuequantity = b.queuequantity,
    a.reservationquantity = b.reservationquantity,
    ...
from itemstock a
join (
    select item,
        Sum(queuequantity) as queuequantity,
        Sum(reservationquantity) as reservationquantity,
        ...
    from itemstock
    where bookyear = 2017
    group by item
    ) b on a.item = b.item
where a.item in (
        select objectid
        from item
        where Itemgroup = 15900239
        )
    and a.Stockno = 0
    and a.bookyear = 2017

您可以连接到项表而不是使用where语句。您可以连接到项表而不是使用where语句。