Question

有人可以解释为什么会这样 -

CREATE TRIGGER [dbo].[T_tskmst_D]
   ON  [dbo].[tskmst]
   FOR DELETE
AS 
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for trigger here
        insert into [database].[dbo].[tskmst] (
            tskmst_revtm, tskmst_revtype, tskmst_id, tskmst_name, tskmst_desc,
            tskmst_type, owner_id, tskmst_public, tskmst_lstchgtm,
            nodmst_id, servicemst_id)
        select GETDATE(), 'D', d.tskmst_id, d.tskmst_name, d.tskmst_desc,
            d.tskmst_type, d.owner_id, d.tskmst_public, d.tskmst_lstchgtm,
            d.nodmst_id, d.servicemst_id
        from deleted d
END

但这不是 -

CREATE TRIGGER [dbo].[T_tskmst_D]
   ON  [dbo].[tskmst]
   FOR DELETE
AS 
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for trigger here
        insert into [database].[dbo].[tskmst] (
            tskmst_revtm, tskmst_revtype, tskmst_id, tskmst_name, tskmst_desc,
            tskmst_type, owner_id, tskmst_public, tskmst_lstchgtm,
            nodmst_id, servicemst_id)
        select GETDATE(), 'D', d.tskmst_id, d.tskmst_name, d.tskmst_desc,
            d.tskmst_type, d.owner_id, d.tskmst_public, d.tskmst_lstchgtm,
            d.nodmst_id, d.servicemst_id
        from deleted d
                inner join tskmst tm on tm.tskmst_id = d.tskmst_id
END

我很困惑为什么删除内部联接会阻止查询能够复制信息？是因为在内部联接发生之前删除了数据吗？是否可以在删除之前复制数据？

我可以从删除但是问题是某些表包含文本列（不要问）所以我无法从删除的其他地方插入我缺少某些列。

Answer 1

它不起作用，因为它是FOR删除触发器。这意味着表中不存在已删除的行。

当你加入任何东西时，你什么也得不到。

MSSQL - FOR DELETE触发器不使用内连接

1 个答案: