加快oracle sql删除查询

Question

我想知道这个查询的最佳替代查询是什么。 （从表现方面）

delete from CDR where anum not in (select msisdn from subs) 
                   or bnum not in (select msisdn from subs)

如果您可以引入可以以相同方式工作的多个查询，那将是很好的。请考虑anum和bnum不能为空。

Answer 1

也许这一个：

delete from 
(select cdr.*
from cdr 
   left outer join subs a on a.msisdn = cdr.anum
   left outer join subs b on b.msisdn = cdr.bnum
where a.msisdn is null or b.msisdn is null);

或

delete from cdr
where rowid <>all
(select cdr.rowid
from cdr
   join subs a on a.msisdn = cdr.anum
   join subs b on b.msisdn = cdr.bnum)

或

delete from cdr
where not exists 
(select 'x'
from cdr
   join subs a on a.msisdn = cdr.anum
   join subs b on b.msisdn = cdr.bnum)

问题是你查询不存在的东西，因此总是很难 使用索引。