我有以下更新语句,它运行了几次并且非常慢(20+秒)。关于如何提高绩效的任何建议?
update acc_item
set means_pay_no = m_pay_no
where acc_item_no in (select distinct(acc.acc_item_no)
from acc_item acc, (select accm.acc_item_no acc1,accm.acc_item_no_2 acc2
from acc_item_match accm,acc_payment_item accp
where accp.acc_payment_no=pay_no
and (accm.acc_item_no = accp.acc_item_no or accm.acc_item_no_2 = accp.acc_item_no))
where acc.acc_item_no = acc1
or acc.acc_item_no = acc2)
and reversed_to_acc_item_no is null;
答案 0 :(得分:1)
如何在临时表中插入语句查询?
select distinct(acc.acc_item_no) into #temptbl
from acc_item acc, (select accm.acc_item_no acc1,accm.acc_item_no_2 acc2
from acc_item_match accm,acc_payment_item accp
where accp.acc_payment_no=pay_no
and (accm.acc_item_no = accp.acc_item_no or accm.acc_item_no_2 = accp.acc_item_no))
where acc.acc_item_no = acc1
or acc.acc_item_no = acc2
update acc_item
set means_pay_no = m_pay_no
where acc_item_no in (select * from #temptbl)
and reversed_to_acc_item_no is null;
答案 1 :(得分:1)
请改为尝试:
update acc_item
set means_pay_no = m_pay_no
where exists (select 1
from acc_item acc
where exists
(select 1
from acc_item_match accm,acc_payment_item accp
where accp.acc_payment_no=pay_no
and accp.acc_item_no in (accm.acc_item_no, accm.acc_item_no_2)
and acc.acc_item_no in (accm.acc_item_no, accm.acc_item_no_2)
) and acc.acc_item_no = acc_item.acc_item_no
)
and reversed_to_acc_item_no is null;