Question

背景：我在MS SQL数据库中有一个表，其中列出了公司和相关供应商及其有效的起始日期和日期。每个公司一次只能有一个供应商。

表结构如下;

_sRID    DataAreaID      Supplier     ApplicableFrom     ApplicableTo
1        Comp1           Supplier1    2018-06-01         (NULL)
2        Comp2           Supplier2    2018-06-01         (NULL)
3        Comp3           Supplier3    2018-06-01         (NULL)

_sRID是身份。

我的触发器就是这个;

   ALTER TRIGGER [trans].[ICOSupplierIDs_AutoEnd]
   ON  [trans].[ICOSupplierIDs]
   AFTER INSERT,UPDATE
AS 
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    update base
    set    base.ApplicableTo = Getdate()
    from   trans.ICOSupplierIDs as base
    join   inserted as ins on ins.DataAreaID = base.DataAreaID
    where  base.ApplicableTo is null
    and    base._sRID != (select max(_sRID) from trans.ICOSupplierIDs where DataAreaID = ins.DataAreaID);

END

因此，在插入＆＃34; comp1＆＃34;表后，该表如下所示;

_sRID    DataAreaID      Supplier     ApplicableFrom     ApplicableTo
1        Comp1           Supplier1    2018-06-01         2018-06-07
2        Comp2           Supplier2    2018-06-01         (NULL)
3        Comp3           Supplier3    2018-06-01         (NULL)
4        Comp1           Supplierx    2018-06-07         (NULL)

有没有一种更简洁的方法来执行此操作而不是最大身份的结束查询并再次点击表格？

TIA

INSERT / UPDATE触发后影响插入的行

0 个答案: