如何改善postgresql查询?
问题描述:
有人可以告诉我如何改进下面的查询,并使其成为一个陈述而不是两个陈述?由于如何改善postgresql查询?
CREATE LOCAL TEMP TABLE tmpdetail2
WITH (OIDS)
ON COMMIT DROP as
select d2.detailid, d2.objid, d2.p
from _detail d2
where d2.detailid in (19, 106);
select distinct d.detailid, d.p, d.pval, d.objid
from _detail d
left join tmpdetail2 d2
on d.objid = d2.objid
where d2.objid is null
and d.p not in(select p from tmpdetail2)
order by p asc, d.detailid asc;
答
with tmpdetail2 as (
select d2.detailid, d2.objid, d2.p
from _detail d2
where d2.detailid in (19, 106)
)
select distinct d.detailid, d.p, d.pval, d.objid
from _detail d
left join tmpdetail2 d2
on d.objid = d2.objid
where d2.objid is null
and d.p not in(select p from tmpdetail2)
order by p asc, d.detailid asc;
+0
感谢@a_horse,我删除了第一个分号,它工作正常。 – fs2050 2014-09-05 14:51:44
+0
@ fs2050:谢谢,那是一个复制和粘贴错误。固定。 – 2014-09-05 15:12:59
什么地方错了 - 你是什么,你寻求改善?它应该做什么? (样本数据?解释?)。为什么用'oids'创建临时表? PostgreSQL版本? – 2014-09-05 13:29:54