0
a和c都是具有400条记录的同一个表。 b和d与300个记录也是同一张表。然而需要大约4分钟来运行这个。我如何加快速度?SQL运行时间太长
select a.docref
from a
left outer b
on a.cono=b.cono and a.tt=b.tt and a.docref=b.docref
where a.cono='VC'
and b.accn08='9005100'
and a.pstper=11609
and a.cbpref not in (select c.cbpref
from c
left outer join d
on c.cono=d.cono and c.tt=d.tt and c.docref=d.docref
where c.cono='VC'
and d.accn08='9005100'
and c.pstper=11609
and c.tt='RX')