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我有以下SQL查询差强人意:提高性能
SELECT
Count(ExtCardID) as CardCount
from
CardIDs CARDS with (NoLock)
inner join
(select CustomerPK
from GroupMembership with (NoLock)
where CustomerGroupID = 14 and Deleted = 0) as GM on GM.CustomerPK = CARDS.CustomerPK
以下Select
部分从上述联接返回的800万个记录:
select
CustomerPK from GroupMembership with (NoLock)
where
CustomerGroupID = 14 and Deleted = 0
是否有更好的办法写上面的sql代码?请指教。
你有什么指标?你能发布执行计划吗? –