help!help!trigger中的問題

Question

select @inserdtcount =count(*)  from inserted
select @inserdtcount =count(*)  from deleted

Answer 1

select @inserdtcount =count(*)  from inserted
select @deletedcount =count(*)  from deleted

Answer 2

declare
  @inserdtcount int,
  @deletedcount int;
select @inserdtcount =count(*)  from inserted
select @deletedcount =count(*)  from deleted

Answer 3

declare
  @inserdtcount int,
  @deletedcount int
select @inserdtcount =count(*)  from inserted
select @deletedcount =count(*)  from deleted

Answer 4

什么条件下触发？declare
  @inserdtcount int,
  @deletedcount int
select @inserdtcount =count(*)  from inserted
select @deletedcount =count(*)  from deleted