sql - 加快 oracle sql 删除查询

Question

<分区>

Answer 1

也许是这个:

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)

问题是你查询的是不存在的东西，因此总是很难 使用索引。