假设你数据库有个A表:
ID NAME
1 aaa
2 bbb
3 ccc
4 ddd
需求：给你几个ID，返回A表中不存在的ID? 例如提交1,2,8,9 返回8,9
select B.id
from (select 1 as id from dual
union
select 2 as id from dual
union
select 8 as id from dual
union
select 9 as id from dual
) B
left join A
on A.id = B.id
where A.id is null;