oracle问题 急救呀

[yanxia611]

现在做一个查询报表，3个表之间的关联，数据有点多，我写的sql：
select distinct
c.afa051 || ' ' || c.afa052 afa052,
b.afa031 || ' ' || b.afa032 afa032,
from fa26 a, fa13 b, fa25 c
where 1 = 1
and ('000000' is null or c.aaa010 = '000000')
and ('' is null or c.afa054 = '')
and a.afa054 = c.afa054
and ('' is null or b.afa030 = '')
and a.afa034 = b.afa034
一直出现扩展temp段，我又增加了表空间，但还是不行，最后测试把distinct去掉，关联可以了，但是加上后面的where条件又 不可以啦，谁出现过类似的情况，给指教指教呀，还有distinct会降低查询速度吗，从我这里看是的，谢谢了

[小灰狼W]

where 1 = 1
and ('000000' is null or c.aaa010 = '000000')
and ('' is null or c.afa054 = '')
and a.afa054 = c.afa054
and ('' is null or b.afa030 = '')
and a.afa034 = b.afa034

'000000' is null 这个条件恒不成立
('' is null or c.afa054 = '') 这里包括一个恒成立和一个恒不成立的条件，加个or恒成立
下一个也一样
不可以是说速度慢，还是查不出结果，还是出错？

[蜜_Lumia]

跟踪

[clarkchiang]

你where后面的字段是否都加索引了，如果没加加一下，试试

[ojuju10]

--真抠门，才3分，友情顶下
select distinct
c.afa051 || ' ' || c.afa052 afa052,
b.afa031 || ' ' || b.afa032 afa032,
from fa26 a, fa13 b, fa25 c
where 1 = 1
and c.aaa010 =nvl('000000',c.aaa010)
and c.afa054 =nvl('',c.afa054)
and a.afa054 = c.afa054
and b.afa030 =nvl('',b.afa030)
and a.afa034 = b.afa034