创建一触发器Student,当向表中插入或者删除记录时，修改表Class中相应的人数
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create trigger trigger_insert on student
for insert
as
update class
set 人数=人数+1
where unitid=(select unitid from inserted)
create trigger trigger_insert on student
for delete
as
update class
set 人数=人数-1
where unitid=(select unitid from deleted)
for insert
as
update class
set 人数=人数+1
where unitid=(select unitid from inserted)
create trigger trigger_insert on student
for delete
as
update class
set 人数=人数-1
where unitid=(select unitid from deleted)
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