sqlserver 用触发器记录操作

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create trigger tri_code on t_jc_code after insert,delete,update
as
begin
    declare @id nvarchar(50)
    declare @typeid nvarchar(50)
    declare @name nvarchar(50)
    declare @code nvarchar(50)
    if exists(select 1 from inserted) and not exists(select 1 from deleted)
    begin
        select @id=id,@typeid=typeid,@name=name,@code=cod from inserted
        insert into t_tri_code(id,typeid,name,cod,atype) values(@id,@typeid,@name,@code,1)
    end
    if exists(select 1 from inserted) and exists(select 1 from deleted)
    begin
        select @id=id,@typeid=typeid,@name=name,@code=cod from inserted
        insert into t_tri_code(id,typeid,name,cod,atype) values(@id,@typeid,@name,@code,2)
    end
    if not exists(select 1 from inserted) and exists(select 1 from deleted)
    begin
        select @id=id,@typeid=typeid,@name=name,@code=cod from deleted
        insert into t_tri_code(id,typeid,name,cod,atype) values(@id,@typeid,@name,@code,3)
    end
end

使用 select 1 from inserted 和 select 1 from deleted 是否有值来判断是insert,update,delete